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The worms are distributed in jujube areas such as Henan, Hebei and Shandong. With nymphs and adults as the culprit leaves, the damaged leaves turn from green to yellow and then fall. In severe cases, the whole leaves of the trees are coked and the yield is low.
The nymph is brown or green, 0.3 mm in length, and the newly hatched larvae are orange-red and turn green after feeding.
The worm occurs one to five generations a year, and it overwinters in eggs, branches, or tree holes. When hatching during the warmer months, the nymph colony damages the jujube leaves, seriously affecting the flower bud differentiation, shortening the flowering period, turning the leaves yellow and brown, and the fruit setting rate is low.
Control methods:
(1) Dormant bark, concentrated on the destruction of eggs.
(2) Spray 5 degrees lime sulfur before sprouting and 0.5 degrees lime sulfur when sprouting.
(3) Preying on natural enemies or feeding predatory natural enemies such as grasshoppers, such as ladybirds, predators, and meat eels, and miss the peak of natural enemies during spraying, and maintain ecological balance.
(4) Chemical control, spraying 73% Kete 1000 times liquid and 40% omethoate 1500 times in the peak period of nymphs and larvae.
The rules of life and control of red spider
苜蓿Red spider is Arachnidae, leafhopper family.