In recent years, corn spider mites have commonly occurred in Xinyi and other places, causing serious damage.
Harmful degree, spring corn is heavier than summer corn
Corn Starscream also harms cotton and bean crops
In corn and cotton crop areas, corn damage is heavier than cotton
The corn spider mite was first harmed on the back of corn near the ground leaf in July. There was a thin screen covering on the back of the leaf and gradually transferred to the middle and upper leaves afterwards.
The 1000-grain weight of the affected maize is generally reduced by 30-50 grams. In severe cases, all the leaves become gray-green, and even dry and dead. The grain weight is reduced by about 100 grams.
The corn spider mite has strong anti-drug ability, and the insects form a mixture of insects, and they inhabit more under the wire mesh under the leaf back. The effect of applying general insecticides is not obvious.
The author used acaricides and insecticides with good effect of killing eggs to control corn spider mite. The effect was ideal.
Such as 20% dicofol 1000 times, effective for each insect state, the efficacy period of 5-7 days; application of systemic insecticide 40% monocrotophos, 40% omethoate, 50% methamidophos 1000-1500 Dosage, efficacy period 7-10 days, 20 days before harvest to stop pesticides
With 20% amitraz EC 1000-2000 times liquid control effect is also very good
Use 80% dichlorvos 1500 times solution to spray at sunny noon, you can kill Ruoqiang and Chengyu within 1 hour, but the effect of killing eggs is poor, need to prevent and cure once in 3-4 days.
Spray the liquid on the back of the leaf when spraying
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