Twospotted spider mite is a wide spread pest, commonly found except Antarctic. Feeds on more than 200 types of plants, in particular, cucumber, rose, apple, strawberry.
Pest feeds sucking plant sap. Some bleached spots appear on leaves, then they merge and leaves become yellow and dry.
Larvae and adults are oval, green with two spots on sides. Diapause females are orange or red, females size: 0,5 - 0,6 mm, males size: 0,3 - 0,4 mm. Larva has 6 legs, nymph has 4 legs.
Begin damaging lower leaves moving to the top. Big population produces webbing.
Reproduce sexually and virginally. Males appear from unfertilized eggs. Female to male ratio is 3:1. Optimal conditions: low humidity (35-55%), high temperature (over 30°С). Cycle from egg to egg lasts 4-30 days. Development from egg to imago lasts 8-20 days. Females during life lay 150-200 eggs (30 days). 4 instars: egg, larva, nymph, adult.
Pest can be brought on clothes or by air blast. Under unfavorable conditions or reduction of daylight to 14 hours fertilized females hibernate.