Control techniques of Diseases and insect pests in sowing period and Seedling stage of Maize

seed treatment

Corn seed treatment before sowing can improve the germination rate of seeds, promote seedling growth, kill germs on seed coat, reduce disease and insect damage, and promote seedling integrity, seedling stage and seedling strength. Seed treatment methods include:

1, drying seeds: the selected seeds will be spread on the ground or mat, 5-6 cm thick, continuous drying for 2-3 days, do not spread the seeds directly on the cement or metal plate, so as not to burn the seeds too high temperature.

2. Seed dressing: 1.5% Zhibingling II can be used to control corn virus disease, and 50 kg of corn seed can be mixed with appropriate amount of water. 100- 150g of 50% carbendazim or 25% triadimefon wettable powder and 50kg of seed dressing can be used to control root rot and black flour disease; 100g of 50% phoxim emulsifiable solution can be used to control underground pests, mixed with 100kg of corn seeds, mixed evenly and dried before sowing. For underground pests and corn disease mixed occurrence, can be mixed with chemicals seed dressing, seed dressing, first mixed with pesticides, dried and then mixed with fungicides.

3. Special seed coating agent. Dosage is 50 ml, package seed 5-7 kg, both disease and pest control.

Seedling control measures

1, corn weed control

Weed control reduces breeding grounds for pests and diseases. Select high-quality herbicides, master the best application period, increase the amount of water when spraying, avoid high temperature and windy weather, spray evenly on the ground, and do not spray again or miss spraying. Follow herbicide instructions strictly to prevent harm. Commonly used herbicides are 1, mu with 40% B A mixture 150-200 ml, 50-80 kg of water, sprayed before the bud after corn sowing. 2. 80- 100ml of 18% Yunongle per mu, 50- 80kg of water, directional spraying at the 2-3 leaf stage of corn. 3. 150 ml of 50% Du-A mixture mixed with 50-80 kg of water per mu shall be sprayed directionally before the 4-leaf stage of corn.

2, seedling pest control:

(1) Laodelphax striatellus and aphids are insect vectors of maize. Spray them with 10% imidacloprid 1000 times solution.

(2) Prevention and control of corn virus disease: in the period of one leaf and one heart of corn, spray 1.5% Zhibingling II 800-1000 times solution every 7-10 days for 2 consecutive times, and spray evenly on both sides of leaves.

(3) Pay attention to the occurrence of armyworm and prevent the bite of wheat armyworm. Because armyworm is a migratory pest, we should pay close attention to its occurrence dynamics. Before the third instar of armyworm larvae, when transparent small spots appear on corn heart leaves, we should control them with pesticides. 25% chlorfenuron gel or NPV virus preparation can be used per mu 30 - 50 g, mixed with water 40 - 50 kg spray, but also can be used to control caterpillars, cotton bollworm and other pests. The spraying time should be selected before 10 a.m. and after 4 p.m. according to the habit of armyworm lying in the daytime and coming out at night.