The potato plants are 40-50 cm in height, grow lush stems and leaves, and when the buds begin to open, the underground potato block begins to form. At this time, the beetle cluster leaves will bite on the leaves, forming numerous wormholes and even all the leaves. Eat up, affect photosynthesis and nutrient accumulation, threatening the formation and enlargement of the tuber, making the tuber less, resulting in reduced production. Therefore, during the formation of potato tubers, attention should be paid to the control of beetles to protect the leaves. Specific prevention methods are as follows:
When the potato began to have buds, pay attention to the inspection of potato leaves, found that the leaves on the abdomen, the head with black spots of the elliptic hard shell insect crawling or biting leaves, it is necessary to spray on the foliage 1000 times 80% dichlorvos, 1500 times 4.5% cypermethrin mixture, or 1,000 times Bacillus thuringiensis aqueous solution, or 1500 times 48% chlorpyrifos, 1500 times 2.5% deltamethrin mixture, or 1000 times 20% buprefone aqueous solution for prevention and treatment, evenly It is advisable to spray all the leaves wet to begin dropping drops of water. 25-30 minutes after spraying, beetles have fallen to death. Since beetles have strong resistance to various insecticides, the agents must be used alternately. Do not use the same agent multiple times in a row to avoid drug resistance and reduce control effects.
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