The rainfall size of maize small spot disease in August was positively correlated with the incidence of small spot disease. When the diseased plant rate reached 70%, the diseased leaf rate began to develop from the bottom up. Early in the rain, the rate of diseased plants rises early; vice versa. When the diseased plant rate is 70% and the diseased leaf rate is 20%, if it encounters moderate to heavy rain, it will break out in about 15 days. When the diseased plant rate is 100% and the diseased leaf rate is 30%, it is necessary to prevent it. First, remove 1-2 pieces of diseased leaves at the bottom of the corn and destroy them; spray 50% carbendazim 500 times, 70% methyl thiophanate 700 times solution, and mancozeb 800 times solution.
When the rate of corn leaf spot disease is 100% and the diseased leaf rate is 30%, it can be controlled. It can spray 12% green milk copper 2000 times liquid, 80% new Wansheng 700 times liquid and so on.
Corn smut disease should be cut off in time and sprayed with 20% triadimefon 1000-1500 times.
Corn dwarf mosaic virus The virus is transmitted by aphids, and the number of field aphids is closely related to the number of weeds in the field. The prevention and control is mainly to eliminate weeds and insects to prevent the occurrence of corn virus disease. Field investigations revealed that suspected strains should be removed immediately, and sprayed with virus inhibitors and anti-caries agents to control, such as 25% virus A500 times + 10% imidacloprid 1000 times liquid spray control.
The corn borer pays attention to the hatching progress of the field eggs and the damage of the larvae, and seizes the critical period to control the first generation corn borer.
The corn armyworm is eaten by larvae and has a lot of food. It is especially fond of gramineous plants. It bites the leaf tissue and forms a lack of trees. When the big occurrence occurs, the leaves are all eaten up. Only the polished rods are left, and the extracted corn ears can also be bitten. Broken, when the food is lacking, migrate in groups, and after eating, stop eating. The sticky insects prefer warm and high humidity conditions and are long-distance migratory pests. The corn field should be controlled by spraying with 5% beta-cypermethrin 1500 times and 40% chlorpyrifos 1000 times before the larva 3 years old.
Maize double-spotted scutellaria: In July and August, the adult and nymph hazards are the main hazards. This damages the corn leaves and stamens and ears. It is the peak of feeding hazard before 10 o'clock in the morning and after 5 pm. When the leaves are damaged, the mesophyll is eaten, leaving only the epidermis. Large transparent white spots appear on the surface of the damaged leaves, which seriously affects photosynthesis; endangering stamens and ears, feeding on filaments, stamens and ears, affecting corn pollination and fruiting. It is sprayed with 5% beta-cypermethrin 1000 times and 40% chlorpyrifos EC 1500 times. The spraying time is better after 5 pm and 10 am.
The cotton bollworm in the corn field of cotton bollworm mainly affects the ear, feeding on the filament, young cob and grain, not only causing loss of yield, but also inducing disease and reducing the quality of the corn. Use 40% phoxim emulsifiable concentrate, 48% risper emulsifiable concentrate and Other pesticides to spray or smear the spikes to obtain the desired control effect.
Weeds in corn field can be sprayed with 20% paraquat water 150-200 ml/mu, 40-60 kg water, and a protective cover is used to spray the corn between the rows. It is forbidden to spray the liquid onto the corn plants.
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