Question: The reader of Jiaofei Township said that he had intermittent silver-white streaks on the back of the corn leaves he had planted, and then the back of the leaves was painted with a layer of silver powder, and finally he saw that the leaves were deformed and dried up. Ask what disease this is, how to prevent it?
Yan Jindong, A: According to the reader, this is a damage caused by corn sedum. Corn sedum is the main pest in corn seedlings. Shandong, Beijing, Hebei and other places are endangered. The adults used a sucking mouthpart to scrape the skin of the corn leaves and inserted the tissue into the tissues to suck juice. The back of the damaged leaves showed intermittent silver-white streaks. The front part of the leaves showed yellow streaks, and the back of the leaves was serious. A layer of silver powder is applied and the leaves are deformed, broken, yellow and dry, and die. Injury of the heart and leaves often leads to bending and deformity of the heart. Huangdeng horses have two generations on corn, endangering spring corn and interplanting corn at the end of May and early June. The second generation of adult emergence from late June to early July, mainly interplanting corn and summer corn.
Huang Dingxi Ma Xi is harmed by the extended leaf surface. The earthworm damage period mainly concentrates on the upper 2 to 6 leaves of the corn. It rarely transfers to the newly expanded leaves, generally reducing the yield by 5% to 15%, and severely reducing the yield by 35%. the above. From late May to early June, the climate has a large amount of drought and heavy damage. On the contrary, it is light, and early sowing of maize is more important than late sowing of corn.
Control methods:
1. Agricultural management: Time seedlings, Dingmiao seedlings, and the removal of infected seedlings, and centralized treatment. Strengthen field management such as fertilization and promote corn growth, resulting in an environment that is not conducive to the occurrence of corn yellow zebrafish.
2. Chemical control; 48% chlorpyrifos 1000 times or 10% imidacloprid wettable powder 4000-5000 times or 70% imidacloprid wettable powder 4000 + 1000% marrifolyl ester 1000 times or 5% moromi powder 500 times or in the early stage of pest occurrence 40.7% of chlorpyrifos (Lostpen) EC 1000 or 10% chlorfenapyr (divided) suspension 2000 times or 5% cypermethrin 20 ml or 25% Thiamethoxam WP 6 g and other drug control. Due to the large number of chemical pesticides used in the past few years, it is recommended that the majority of farmers in the prevention and treatment of chemical pesticides at the same time the best plus some silicone additives, so can play a multiplier effect.
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