Cotton field

Scientific name Thrips flavus Schrank Thysanoptera, Thripidae. Synonyms T.clarus, T.flava, T.flavidus. Alias ​​is a vegetable field, a yellow horse, a winter dog, a horse, a horse, and a bright horse. Distributed in southern China, Guangdong and Henan provinces. The other northern provinces are unknown.

Host cotton, sweet potato, corn, soybeans, eggplant, squash, cucumber and other melon crops, onion, rape, lily, and Ziyun. In August-September 1996, the worm was exposed in Zhoukou, Henan Province. The area of ​​its occurrence was large, the scope of its distribution was wide, and the severity of the damage was extremely rare. Among them, cotton, soybeans, eggplants and cucumbers are the most affected.

Injury characteristics, nymphs sucking heart leaves, young tender, young leaves, flowers and young fruit juice liquid, hardened or reduced victim leaves, internode shortening, plant growth is slow, causing cotton leaves withered, leaves, buds, young bells Fall off.

Morphological characteristics Adult body length 0.9-1.1mm, light yellow body, tentacles of 7 sections, monocular squatting position in the outer edge of the monocular deltoid line, the back of the scutellum mesh pattern with l on the bell-shaped sensor. Males 3-7 abdominal belly glands. Egg length 0.2mm, kidney-shaped. Nymphs are yellow, compound eyes are red, antennae are 7 knots, young nymphs are yellow, no wing buds, and nymphs after 3-4 years of age grow wing buds.

Habits of life 20 1 2l generation of Guangzhou, overlapping generations, no dormancy period. In Henan, the number of generations is unclear, adults are lurking in clods, under earth seams or between litter and winter, and a few nymphs are wintering. The activities started in April of the following year, and the peak of damage occurred from May to September. The fall was the heaviest in the autumn. The adult of early feathering has the habit of upward and hi-green, is very lively, can fly, jumps quickly, and is afraid of strong light. On sunny days, the adults hide and feed at the crop growing point, and a few are on the back of the leaf; female adults can perform parthenogenetic reproduction. Eggs are often produced in plant leaf tissue. Developmental optimum temperature 25-30 °C, warm winter to its safe winter, prone to the occurrence of the following year.

Prevention and control methods Note that the insects occur in the local area. When spotting occurs, spray 5% quinone 2000 times solution or 25% ikasulf(equivalent) emulsifiable concentrate, 50% acefosmethicin emulsifiable concentrate, 40% dimethoate emulsifiable concentrate in time. 1000 times liquid, pyrethroids 4000 times liquid, fish rattan fine 400 times, 50% Batadan soluble powder 2000 times are effective. In areas with low insecticide control efficiency, 40% Qixingbao emulsion 600-800 times solution or 5% Ruijinte suspension agent 1500 times solution, 10% once-through net (imidacloprid) wettable powder 2000 times solution, 44% can be used. Sacchi Emulsion 1000 times, 10% Divide Emulsion 2000 times, 1.8% abimycin 4000 times, 10% Saipoke or 35% Saitan 2000 times, use 2-3 times Received stable and significant results.