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Purple Power

Grow Hack: Predatory Mites on the Attack!

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Grow Hack: Predatory Mites on the Attack!


By Snake Blissken  January 12, 2017



When most cannabis growers hear the word mites, they cringe at the thought of the notorious spider mite munching away on their beloved plants. Many people deal with spider mite infestations by spraying them with repeated applications of some pesticide (whether organic or not), but as the industry matures, growers are likely going to have to start fighting fire with fire.

Yes, that’s right! Mites that kill mites.


Increased regulations, concerns for safety and downright effectiveness are going to be the driving forces behind this change. Predatory mites have been used in conventional agricultural for ages, and it’s about time that the cannabis industry catches up.


First, what are predatory mites?


They’re exactly what they sound like, a type of mite that eats other mites. Where spider mites are herbivores, feasting on your hard work, predatory mites are strictly carnivorous and will only eat other bugs. Think of them as an organic army of spider mite assassins.


Persimilis and californicus are some of the more common predatory mites, but there are several other types of mites that are suited for different climates, pests and growing conditions. With an arsenal of mites at your disposal, you can fend off spider mites, thrips, broad mites, whiteflies, fungus gnats and more—whether you’re growing indoors, outdoors or greenhouse—predator mites have your back and will help your buds pass state-mandated pesticide tests.




Andrew Maltby of Biotactics places predatory mites on flowering cannabis plants at Safe Harbor Patients’ Collective.

Regulation of the cannabis industry is going to force a switch to more organic and sustainable pest management, like predatory mites. With AB 266 and Prop 64 coming soon to California’s legal marijuana industry, growers there don’t need to look far to see the implications of tighter testing standards.


Their neighbor to the north, Oregon has a huge backlog at their state-approved cannabis testing labs and has issued two recalls for pesticide-tainted marijuana. One state further north, Washington, has also issued recalls on product due to pesticide concerns. Not to mention, the recall in the birthplace of regulated cannabis, Colorado.


Or how about in Massachusetts, where the state set the testing standards so high that the labs didn’t even have equipment able to detect such a minute amount of residual pesticide? Labs in Nevada have faced similar problems. Canada’s federal medical marijuana program has similarly exacting standards, which has already led some of the licensed producers there toward using predatory mites.


These regulations could lead to a rude awakening for many growers not currently forced to test their wares, but the concerns for safety are appropriate and seem to have the consumer’s best interest at heart.


Considering some of the numbers recently released, consumers might actually become bigger advocates for predatory mites than industry professionals.


Steep Hill Labs recently reported that over 84 percent of cannabis samples submitted to them test positive for residual pesticides. More than 65 percent tested positive for myclobutanil, a common pesticide ingredient that turns into hydrogen cyanide (a poison) when heated (like when smoking or dabbing). This should be a great concern for all cannabis smokers, considering California supplies a large amount of the cannabis throughout the nation.......




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Thank you @purplepower for all the great news.  Has anyone used the predator mites, and does anyone have a preferred source.  I'm looking into Amblyseius swirskii for help with finally defeating The Borg once and for all.


sillydog sez, "Dope grows."

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It's been awhile since I've used predator mites. But I do routinely buy and release all kinds of beneficial insects outdoors. Until I started doing this my area was infested with those borg we call spider mites,.. I do have a few choice words I call them too. they were in everything: trees, bushes, flower gardens, veggie gardens, even the lawn had them. This is where I go to get them  http://www.naturescontrol.com/index.html


I released what the call "Triple Threat" Spider Mite Predators. Spider Mite Predators not only feed on Spider Mites and their eggs, they also breed twice as fast! a very good thing imo. Each Spider Mite Predator sucks the juice out of about 5 Spider Mites a day, or 20 of their eggs. Used as directed, predators should noticeably begin to gain control within 4 weeks, and then continue until the Spider Mites are nearly or completely wiped out. Predators disappear when the Spider Mites are gone. They 3 species to cover a wider range of growing conditions.

   Wide Temp Range, Moderate Humidity:
   Phytoseiulus persimilis
      Temperature Range: 55 - 105+ F.
      Humidity Range: 55 - 90%

   Moderate Temp Range, High Humidity:
   Neoseiulus californicus
      Temperature Range: 55 - 90 F.
      Humidity Range: 60 - 90%

   Widest Humidity and Temp Range:
   Mesoseiulus longipes
      Temperature Range: 55 - 105+ F.
      Humidity Range: 45 - 90%

   All three types can be used either separately or in any combination.link here: http://www.naturescontrol.com/mite.html#tt


One of my favorites is Predator Nematode, I used them with every grow. if there's a pest in the soil these guys will eat them. I've also released:


Pirate Bugs (Mainly for use against Thrips, Aphids, and, Mites),


Ladybugs (Hippodamia convergens) eat over 5,000 Aphids and other soft-bodied pests during their one-year lifetime. Ladybugs are one of the few beneficial insects that can be stored, dormant, in the refrigerator for up to a few weeks, depending on the time of year, as long as they don't freeze or dry out. This allows you to use a few at a time, as needed. To keep Ladybugs from flying away, spraying their backs with a soda pop/water solution glues their wings shut for about a week. They saved me a few summers ago with my veggie garden. The problem was aphids and the ants that were farming them. some laid eggs and in weeks after they hatched the problem was controlled and not affecting my veggie garden.


Green Lacewing Larvae/Eggs- For use against Aphids, Thrips, Mealybugs and Whiteflies.


Mite Destroyers eat all stages of Spider Mites, and find new infestation sites on their own by flying. But, it takes 4-6 weeks to really get these guys going, so use Predator Mites as well for more immediate control and for cleaning up small "trouble spots". Life cycle takes 18 days at 70 F. 100 Spider Mite Destroyers gets a colony started.







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I picked up A. swirskii on the same day for like $1.50 a pouch at Ladybug in Medford and was shocked they had 'em on hand.  Was that why they had 'em in stock?


sillydog sez, "Dope grows."

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I'm actually a bit north of Medford in the Eugene area but pretty close. I visited down there this summer though and a couple growers had some huge trees going outdoors down there. I read online that the company that grows them and packages them was bought out so maybe the new reps are pushing out product



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Well, that price might reflect their viability...I have yet to see a single living predator, and even dissected a packet.  Is there a way to check viability before leaving the store or would I just be taken for a jerk?


sillydog sez, "Dope grows."

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Well, that price might reflect their viability...I have yet to see a single living predator, and even dissected a packet.  Is there a way to check viability before leaving the store or would I just be taken for a jerk?



The place I get all my 'Hired Bugs' as they call them, check them either move the container and look if the bugs are big enough to see them moving or under a microscope. They're looking for movement.  They do keep them in a dormant state while at their store. They tell you how to wake them up, release them, if they fly how to keep them around for about a week (ladybugs), etc.


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                         Beneficial bug: Spider Mite Predators


                                                                                                (multiple species)







                                                    Neoseiulus californicus feeding on a twospotted spider mite, Tetranychus urticae Koch.

                                                                                               Photograph by Lyle Buss, University of Florida.




Special Species Notes: The western predatory mite is more effective under hot, dry conditions. Most pernicious varieties of mites prefer hot, dry conditions


 Spider Mite Predators are predacious mites are the carnivorous cousins of leaf-feeding spider mites and other pestilent mites that feed on plants. They not only feed on Spider Mites and their eggs, they also breed twice as fast.


Each Spider Mite Predator sucks the juice out of about 5 Spider Mites a day, or 20 of their eggs. Predators should noticeably begin to gain control within 4 weeks, and then continue until the Spider Mites are nearly or completely wiped out. Predators disappear when the Spider Mites are gone, most species of the predators starve or migrate elsewhere.


Predators don't make any webbing


Pests they eat:


Broad mite (Polyphagotarsonemus latus),

cyclamen mite (Phytonemus pallidus),

two-spotted spider mite (Tetranychus urticae),

red spider mite (Tetranychus cinnabarinus),

tomato russet mite (Aculops lysopersici),

rust mite (Eriophyidae).

 Mites (Tetranychus sp),

Spider Mite (Mult),

Pacific Mites (Tetranychus pacificus),

 European Red Mites (Panonychus ulmi),

Bank's Grass Mite ( Oligonychus pratensis)

Brown Almond Mite (Bryobia rubrioculus),

Citrus red mite (Panonychus citri)

McDaniel spider mites,

Yellow spider mites,

Apple and Pear rust mites,

Prunus rust mites,

 Blister mite

Prunus rust mites

 russet mites





Predatory mites are about the same size as plant-feeding mites but have longer legs and are more active; they also are more teardrop/ pear -shaped than spider mites.


 They are white until they feed after which they take on the coloration of their prey (usually red or brown).


The eggs are pear shaped, almost transparent, but slightly larger than the round European red mite eggs. The nymphs are also transparent and difficult to see without a microscope.


You'll see that each has different shapes and colors — spider-mites are shaped like little spiders, and have a black spot on each shoulder (they grow larger as the mite grows), while the predators are colored different (clear to red, depending on variety), have longer legs, and a more rounded, streamlined appearance. You will need a 16X magnifier minimum to see them.


the Phytoseiidae family. This group of predatory mites is distinctive in that it has relatively few hairs on its back, 20 pairs of hairs at most. The commercially available predatory mites such as Amblyseius cucumeris, Amblyseius degenerans, Amblyseius californicus, and Phytoseiulus persimilis all belong to the Phytoseiidae family. Some are easy to recognise by their colour. For example, Amblyseius degenerans (which is released in sweet pepper crops) is always dark brown or black in colour. The spider mite specialist, Phytoseiulus persimilis is always bright red.


Life cycle


Mated adult females may overwinter in plant crevices or other protected areas if prey is available in the fall. They emerge as early as bloom, but in reduced numbers due to heavy winter mortality.


Eggs are different, too — spider-mite eggs (always in abundance!) appear perfectly round, clear to amber in color (depending on how close it is to hatching), while predator eggs are at least twice as large, and colored slightly pink. they often lay their eggs right among the spider-mite webbing, and/or along the ribs of the undersides of leaves.



you should see a gradual increase in their population, and after a few weeks of increase, the spider-mites decline. Predators go from egg to adult in about 7 days, while spider-mites take about 14 days (depending on temperature).


Common Species: 


Amblyseius swirskii




Temperature Range: 60 - 90 F.

Humidity Range: 70%


A. swirskii, occurs in the wild in the countries around the Mediterranean Sea.


Excellent beneficial mite for warmer and humid environments they reproduce quickly . Amblyseius swirskii are an excellent beneficial mite that resembles other predatory mites and take on the color of what they are consuming.


Adult females lay single eggs arranged on leaf hairs. When temperatures are around 77°F the larvae will hatch and mature to adulthood in about a week. This predatory beneficial prefers warm, humid environments but survives cooler nights by moving to lower locations amongst the plants.


They do not enter hibernation when temperatures cool so they are efficient in areas where temperatures drop below 60°F and with less than 12 hours of light. They are not resistant to frost. If the humidity in the microclimate around the leaf surface drops below 70% for a substantial length of time, the eggs of the predatory mite dehydrate and will not hatch.


Depending on the stage of development, they can consume about 10 thrips or whitefly larvae a day and up to about 20 whitefly eggs per day. This beneficial can survive by consuming pollen and mold.


The mites go through three immature stages, larva, protonymph, and deutonymph, before becoming adults. All mobile stages are predatory. The mites feed by piercing small arthropod prey or grains of

pollen with their mouthparts, and draining the contents.


A. swirskii cannot be distinguished from a number of other predatory mites such as A. cucumeris, A. californicus, Amblyseius barkeri or Amblyseius andersoni with the naked eye or with a magnifying glass.


The differences in appearance are subtle and can only be seen under a microscope. However, if you want to be sure which predatory mite you are dealing with, you must seek an expert to determine the species.


The colour is completely dependent on what the mites have been eating. This can vary from dark red, to purple, to light yellow. With thrips and whitefly as prey, the colour tends to be a kind of light orange. It is also difficult to tell from its behaviour which predatory mite you are dealing with.


Amblyseius andersoni





Working temperature range: 42 - 100°F


Relative Humidity: Higher humidity needed for environments with higher temperatures


Amblyseius andersoni is a predatory mite that is native to North America, throughout Europe, including the UK and the Netherlands. They feed on and control all stages of phytophagous mites of various species, but also feed on Thrips, and russet mites.


It is active at lower temperatures than other predatory mites, which means that it can be introduced much earlier in the growing season than some other predators. This predatory mite feeds on broad, cyclamen, russet mites and two-spotted spider mites.  They will also feed on pollen, honeydew, and thrips larvae allowing the population to survive when pest mite populations decrease. They will not control a thrips infestation. They are a good choice for pre-emergent control of pest infestations Active and effective with low humidities and high temperatures.


Adult females lay about 35 eggs in a lifetime, arranging eggs on leaf hairs. Eggs hatch in approximately 2-3 days, molt twice and reach adulthood in approximately 10 days. The eggs hatch at temperatures between 68° and 77° F. In cooler temperatures they will enter diapause to survive. Studies have shown that A. andersoni have a 100% diapause incidence below 18°C (64.5°F) ,and when it is light for 10 hours or less. They may enter diapause in late summer, but are active from early in the season.



Neoseiulus (= Amblyseius) californicus (cal if orn ah cus)







 Dorsal view of a Neoseiulus californicus larva indicated by pointer. An adult Neoseiulus californicus and a cluster of spider mite eggs are shown for size comparison. Photograph by Jack Kelly Clark, University of California



Temperature range: 50-91° F


Relative Humidity: 40-80% ; prefer humidity at the upper end of this range.


The predatory mite Neoseiulus californicus has characteristics of both type II specialist predatory mites and type III generalist predatory mites. Neoseiulus californicus prefers Tetranychid mites as food, but will also consume other mite species, small insects, such as thrips, and even pollen when the primary prey is unavailable.


Neoseiulus californicus has a very complex taxonomic history. It was first described by McGregor in 1954 from lemon in California as Typhlodromus californicus. After 1954, it was moved to the genus Amblyseius and later to the genus Neoseiulus or Cydnodromus, and now Neoseiulus chilenensis (Dosse) is considered a synonym of Neoseiulus californicus.


Natural populations of Neoseiulus californicus, are found in Argentina, California, Chile, Florida, Japan, South Africa, Texas, parts of southern Europe, and all along the border of the Mediterranean Sea.


Neoseiulus californicus. Larvae have only six legs. Both nymphal stages, the protonymph and the deutonymph, resemble the adults except that they are smaller and cannot reproduce. Adult females are approximately 0.1 mm (0.00039 inch) in length and oval in shape. Males are slightly smaller than females. Both males and females are translucent and can be pale orange, peach, or pink in color.


Females can lay up to four eggs a day. Eggs take from a day to 4 days to hatch depending on the temperature. eggs are football shaped, approximately 0.04 mm (0.00016 inch) in length, and are pale whitish in color. Eggs hatch into six-legged larvae and are translucent in color.


 They can progress to the protonymphal stage without feeding. then passes through two nymphal stages: protonymph and deutonymph. Both stages (protonymph and deutonymph) are active feeders and last for 1 to 3 days each. Total developmental time can be as short as 4.0 days or as long as 12.0 days depending on the temperature. With higher temperatures, they develop faster. Neoseiulus californicus develops faster when consuming the twospotted spider mite, Tetranychus urticae Koch, than when consuming other prey sources. However, it will also successfully develop and reproduce when consuming other mite species including: Aculus schlechtendali (Nalepa), Oligonychus pratensis (Banks), Oligonychus perseae Tuttle, Oligonychus ilicis (McGregor), Panonychus ulmi (Koch), Phytonemus pallidus (Banks), Polyphagotarsonemus (Stenotarsonemus) latus Banks (the broad mite), and Phytonemus pallidus L. (the cyclamen mite). It can also survive and reproduce by consuming thrips and other small insects, but reproduction is very low. Neoseiulus californicus can even survive for a short period of time by consuming only pollen.


They work extremely well to control mite infestations in greenhouses. Suggested for tomatoes, roses and other vegetable crops.


Adults live for approximately 20 days




Western predatory mite

Galendromus occidentalis (ox ci dent tal us)






Temperatures: 80 -120F degrees Humidity: 30 to 85% Does not do well in cool coastal areas.  In temperatures less than 80° F and under 11 hours of daylight, it may go into hibernation or slow down consumption of mites considerably.

If storage is necessary refrigerate at 45°-50° F. for up to five days.


highly susceptible to pesticides such as permethrin, methomyl, and esfenvalerate. Avoid using these pesticides at least one week prior and one week after release of the predators.


What they eats: two spotted mites, Russet mites, Pacific spider Mites (Tetranychus sp)


Environment: Outdoors, Crops, Orchards & Vineyards, Nursery, Greenhouse, Grow Room, Hydroponics, Aquaponics, Pond & Environment, Interiorscapes, Container Plants


Like other mites, western predatory mites do not have antennae, segmented bodies, or wings


The mated females overwinters in debris under the trees and in crevices on the tree itself. Many die during very cold winters. Emergence begins at first bud, and the mites disperse, looking for either spider mites or apple rust mites. They will also consume European red mites, but they do not seek them out and don't eat their eggs. Adults hunt along the leaf midveins during the day, and over the entire leaf surface toward nightfall.


The eggs are pear shaped, almost transparent, but slightly larger than the round European red mite eggs. Eggs are laid on the undersides of leaves, in the opening buds and on the flowers and hatch in 1-4 days. Develops from egg to adult in 7 to 14 days depending on temperature. The larvae are also transparent and difficult to see without a microscope. Of the five G. occidentalis life stages, only the larvae are six legged. All other post-egg stages have eight legs. In all stages, it is indistinguishable from Neoseiulus fallacis and Galendromus pyri, other phytoseiid predatory mites, without a compound microscope.


Adults eat 1-3 pest adults or up to 6 pest eggs/day. Adults are shinier pear-shaped mites that are less than 0.5mm long. about the size of two spotted spider mites. They range in color from beige, amber and red. It depending on what they just recently consumed. They are able to hunt in extremely hot conditions, without requiring a high humidity (at least 50%). It will also feed on pollen when mite populations are low. In addition, predatory mites are more active than pest mites, only stopping to feed. Under magnification the mouthparts of predatory mites can be seen extending in front of their body while pest mite mouthparts extend downward to feed on plants.


Females survive about 30 days and lay about 21 eggs. G. occidentalis reproduces very quickly, and there may be 8-10 generations per year.




Phytoseiulus persimilis(pur sim ill us)






Temperature Range: 70 - 105+ F.

      Humidity Range: 55 - 90%


If not releasing immediately, keep in a cool dark place out of direct sunlight. Do not refrigerate


Humidity strongly impacts P. persimilis' efficacy. Development was observed to almost stop at humidities of 25-30%, and relative humidities below 70% resulted in a reduction in the ability of immatures to molt from one stage to another. In one study, at a relative humidity of 40% (temperature 27°C), only 7.5% of eggs hatched compared to 99.7% at 80% relative humidity (same temperature). Eggs held at a relative humidity of 50% appeared to shrivel at all temperatures from 13-37°C.


Mite Predator Release 10-15 per 10 sq ft




Outdoors, Crops, Nursery, Greenhouse, Grow Room, Hydroponics, Aquaponics, Pond & Environment, Interiorscapes, Container Plants. is the most commonly used predatory mite in greenhouses.


Due to its tropical origin, P. persimilis does not have a diapause stage and is active year-round in enclosed habitats such as interior plantscapes and greenhouses.This mite was accidentally introduced into Germany from Chile in 1958; it was subsequently shipped to other parts of the world, including California and Florida, from Germany. A great mite predator for spider mites in humid greenhouses and for dense field crops.


should be applied as an active control, not as a preventative measure.

These are the biggest seller for cannabis growers These are true killers that can’t go long without food. They’re voracious predators of most of the spider mite pest Tetranychus spp. Some of the species they impact include: the two-spotted mite T. urticae, the carmine red mite T. cinnabarinus, and the Pacific mite T. pacificus. They have the highest consumption rate of all phytoseiids.

What it eats:


Mites (Tetranychus sp), Spider Mite (Mult), Two-Spotted Spider Mite (Tetranychus urticae). They’re voracious predators of most of the spider mite pest Tetranychus spp. Some of the species they impact include: the two-spotted mite T. urticae, the carmine red mite T. cinnabarinus, and the Pacific mite T. pacificus.


eat from 5-20 prey (eggs or mites) per day,

Description Adult females are reddish, oreange, or tan, pear-shaped,, no spots,  about  are about the size of a two-spotted spider mite, (0.5 mm long), longer legs then a spider mite.  Immatures are a pale salmon color and males are smaller and lighter in color. Eggs are oblong and about  twice as large as the pest mite eggs. About 80% are females. At optimum temperatures, Phytoseiidae can develop from egg to adult in 7 days and live up to a month. A well-fed female lays about 50-60 eggs in her lifetime. 50 day-long lifetime at 17-27°C Lifestyle

The tiny orange to bright reddish orange female spider mite predators lay eggs within spider mite concentrations and their webbing.


They hatch (in 2-3 days) into minuscule larvae which develop into nymphal forms before reaching adulthood. These, too, are fierce predators consuming many spider mites, eggs, and young. The lifespan of these spider mite predators is roughly 8 days in their immature stages, then around 36 days as adults.


They’re very fast, very active, very thorough, and are gluttonous. however they are picky eaters, if there doesn’t happen to be a spider mite suitable (web-spinning types)  to the tastes of Phytoseiulus persimilis available, they’ll quickly starve to death. They prefer the two-spotted mite T. urticae, the carmine red mite T. cinnabarinus, and the Pacific mite T. pacificus. they can cause extinction of their spider mite prey.


its ability to disperse is dependent on the environment. If infested plants' leaves touch, dispersal is possible. When the plants have little contact with each other, dispersal is reduced by about 70%. P. persimilis moves upward on the plant in search of prey and disperses when prey is scarce. Nymphs do not disperse easily, and are left behind when prey becomes scarce.


cooler temperatures will hamper reproduction and development to a certain degree. Predatory mites thrive in humid environments, whereas pest mites enjoy dry surroundings. Increase humidity by moistening soil or use a cool-mist vaporizer around plants in enclosed areas. Release Phytoseiulus persimilis in late evening on the day





Mesoseiulus longipes (lon gi peas)




      Temperature Range: 55 - 105+ F; does best at temperatures between 80-90 ˚F

      Humidity Range: 45 - 90%; can tolerate lower humidity levels (40% RH  at 70˚ F).


Release rates:

indoors, 3/sq. ft. bi-weekly, 3-5 times;

outdoors, 5,000-20,000/acre, bi-weekly, 3-4 times.



These predators are similar to P. persimilis but can tolerate lower humidity (40% at 70 degrees F). Longipes are effective in temperatures up to 100 degrees F, although a comparable increase in humidity is required. Apply these predators in warm greenhouses and interiorscapes with artificial lighting; does not thrive outside


 Longipes are pear-shaped mites that are less than 0.5mm long. They range in color from beige, amber and red. They are able to hunt in warm conditions (like Occidentalis), but differ in that they are also able to hunt in extremely dry conditions.


Target Pest: Two-spotted spider mite (Tetranychus urticae)


Life Cycle: 


Female s are  predominant  , 4 to 1,  and will lay eggs (up to 54) among their prey, concentrating in high populations and in the webbing. Eggs are laid on the underside of leaves and will hatch in 1-4 days. Five life stages: egg, larvae, protonymph, d eutonymph , and a dult. Longipes will live about 8 days in immature stages, and then for another 34 days as adults



They are susceptible to pesticides. Avoid spraying crop one week before or after releasing predators. Some materials may be toxic for up to four weeks.




Neoseiulus (Amblyseius) fallacis




Temperatures: 48-85°F


Relative humidity: 50% or above



Fallacis needs a relative humidity of over 50% to survive, particularly in the egg stage. In hot, dry conditions, raise the humidity by watering or misting plants


 very resistant to commonly used pesticides.


Apply 2-3 each per 10 square feet


A native predatory mite that feeds on two-spotted spider mites and eriophyid mites(broad,rust, cyclamen).  Optimal environment is in a dense canopy. they remain if mites or pollen are available for food. When prey become scarce, fallacis moves to the top of the plant and usually disperses throughout the crop on air currents or the wind. When predators are found on each infested leaf, it usually means that the biological control program will be successful. It may take another 2-6 weeks for new plant growth to show improvement, depending on growth rates.


the most effective preventer of spider mites available. In long term crops usually one application at a rate of 1 to 2 mites per square meter is enough to achieve multi-year spider mite control. In starving conditions, fallacis is a generalist, capable of feeding on many other pests, especially their eggs. If no pest is present, fallacis will survive on wind-blown pollen


In outdoor applications, it is best applied at the end of the summer, allowing it to build up slightly, then over-wintering with the pest. We have not found a mite that fallacis will not control.


Fallacis is used to control two-spotted spider mites (and other mites) on Cannabis, greenhouse peppers, field strawberries, raspberries, currants and mint. In British Columbia, Washington, and Oregon, Integrated Pest Management (IPM) programs for field berry crops are based on using Fallacis as the primary control for spider mites. Fallacis is more resistant to pesticides than most biological controls.


Fallacis can reproduce at lower temperatures than other predatory mites and displaces them in cooler growing areas in the Northern United States.




Life Cycle

Development from egg to adult takes from 7-9 days at 70°F, to 3 days at 85°F. At 78°F, a fourfold increase in numbers can occur within 4 days. In the field, under optimum conditions, populations can increase from 10 predators per 100 leaves, to 200-500 predators per 100 leaves in just 2 weeks.


Adult females lay 1-5 eggs per day, for a total of 26-60 eggs over their lifetime (which could be between 14-62 days). The eggs hatch in 2-3 days, which are oval in shape and twice the size of the two-spotted mite eggs. Newly hatched predators do not eat, but later stages and adults feed on all stages of prey. Female Fallacis can eat 2-16 spider mites per day.


Adult females enter diapause in response to the short days in the fall (less than 14 hours of daylight). They stop reproducing and move into sheltered areas, such as under bark or ground cover. They do not enter diapause in greenhouses or interior plantscapes if the temperature is 64°F or above.




Amblyseius+andersoni.jpeg   Hang from crop wire or under plant canopy

Do not hang adjacent to heating pipes the bags have the predator mitesAmblyseius+andersoni2.jpeg





Other beneficial bugs these work with:


sixsoptted thrips


western flower thrip- predator on spider mite eggs and larvae, but this species will also inflict severe damage to plants if mites aren’t present on which to feed.


spider mite destroyers- the larvae and adults


pirate bugs


bigeyed bugs





The link below will take you to "An Intro to beneficial bugs and beneficial insect food" it has a list (been worked on) to pests and beneficial insects





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