The amount of rainfall in August of Maize leaf spot was positively related to the incidence of leaf spot disease. When the diseased plant rate reached 70%, the diseased leaf rate began to develop from bottom to top. The rainfall is early, the strain rate rises early; otherwise it is late. When the diseased plant rate is 70% and the diseased leaf rate is 20%, an outbreak occurs in about 15 days after a moderate to heavy rain. When the diseased plant rate is 100% and the diseased leaf rate is 30%, prevention and control will be carried out. First remove 1-2 pieces of diseased leaves from the bottom of the corn and destroy them; spray 50% carbendazim 500 times, 70% thiophanate-methyl 700 times, and mancozeb 800 times.
When the rate of diseased corn plants reaches 100%, and the diseased leaf rate is 30%, it can be controlled. Can be sprayed with 12% green milk copper 2000 times, 80% new Wansheng 700 times and so on.
The disease of corn smut disease should be promptly cut off and sprayed with 20% triadimefon 1000-1500 times liquid.
Maize Dwarf Mosaic Virus Disease The virus is transmitted by aphids, and the number of field aphids is closely related to the number of weeds in the field. Prevention and control is mainly to eliminate weeds and insects to prevent the occurrence of corn virus disease. Field investigation found that suspicious strains should be immediately removed and sprayed with virus inhibitors and anti-caries agents to control, such as 25% virus A500 times +10% imidacloprid 1000 times spray control.
The corn borer pays attention to the hatching progress of eggs and larvae damage in the field, and seizes the critical period to prevent and control the first generation of corn mash.
The armyworm larvae feed on larvae and their food habits are very complex. In particular, they prefer grassy grasses to eat leaf tissue and form missing trees. When they occur, they often eat up all the leaves, leaving only the bare stems. The extracted ear can also be bitten. In the absence of foodstuffs, swarms migrated and, after aging, stopped feeding. The armyworm prefers warm and humid conditions and is a migratory pest for long distances. Corn fields should be controlled with 5% of 5% beta-cypermethrin and 1500 times of chlorpyrifos and 1000 times of chlorpyrifos before the third instar of larvae.
Maize double-spotted spider mite: From July to August, adults and nymphs were the main hazards, which harmed the leaves and stamens and ears of corn. Before 10 o'clock in the morning and after 5 o'clock in the afternoon, it was the peak of feeding damage. When the leaf was damaged, only the epidermis was taken and only a large number of transparent white spots appeared on the surface of the damaged leaves, which seriously affected the photosynthesis; harmed the stamens and ears, and took the filaments, stamens, and ears to affect the corn pollination and seed setting. The use of 5% hypercypermethrin 1000 times, 40% chlorpyrifos EC 1500 times spray control, spray time after 5 pm and 10 o'clock before the better.
In the corn field of Helicoverpa armigera, the bollworm mainly damages the ear of the ear, and feeding on the filaments, young cobs and grains not only causes loss of yield, but also induces the occurrence of disease, which causes the quality of the corn to decline. Choosing 40% phoxim EC and 48% LOSCAN can be sprayed or daubed with appropriate amounts of pesticides to obtain the desired control effect.
Corn field weeds can be used 20% paraquat water agent 150-200 ml / mu, watered 40-60 kg, plus a protective cover corn directional spray, prohibit the liquid sprayed onto corn plants.
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