ARTICLE REVIEW-ECONOMIC IMPORTANCE AND LIFE CYCLE OF TWO-SPOTTED SPIDER MITES TETRANYCHUS URTICAE KOCH

Abstract

The current study concluded that two-spotted spider mites Tetranychus urticae Koch is a widespread polyphagus pest in the world that infests a large number of economic plant hosts. The two-spotted spider mites importance is due to some a features that enabled it to survive and spread, including: its rapid reproduction rate, multigenerationalism during the year, the resistance against acaricides, a webs weaving which cause negative effects for the plant and transport fungal and viral pathogens for the plant. The two-spotted spider mites dynamic population is determined by several factors: temperature, humidity, rainfall, soil type, pesticides used, proximity to plant hosts and natural enemies. This species has five life stages: the egg, larva, protonymph, deutonymph and adult. The two-spotted spider mites larvae have three pairs of legs, the other stages have four pairs of legs