Techniques for pest control in summer maize sowing and seedling stage

First, seed treatment

Seed treatment before corn sowing can increase the germination rate of seeds, promote the growth of seedlings, kill germs on seed coats, reduce pests and diseases, and promote seedlings, seedlings and seedlings. The methods of seed treatment are:

1. Sun-breeding: Spread the selected seeds on the land or on the mat, 5-6 cm thick, and continuously turn the sun for 2-3 days. Avoid spreading the seeds directly on the cement or metal plate to avoid overheating the seeds. .

2 , pesticide dressing: control of corn virus disease can be 1.5% phytopathogenic II 100 liters, with appropriate amount of water can mix 50 kg of corn . For the prevention of root rot and smut, 50% carbendazim or 25% rust WP can be used in 100-150 g, 50 kg of seed dressing ; 50% phoxim emulsifiable concentrate 100 can be used for controlling underground pests , and water is mixed with corn. 100 kg, mix well and dry to seed. For the mixed occurrence of underground pests and corn diseases, mixed seeds can be used for seed dressing. When seed dressing, first mix the insecticides, dry them and mix the fungicides.

3 , special seed coating agent coating. The dosage is 50 liters, and the seeds are 5-7 kilograms, which is both disease prevention and pest control.

Second, the prevention and control measures during the seedling period

　 1 , corn weed control

Controlling weeds can reduce the breeding ground for pests and diseases. Choose high-quality weed herbicides, master the best drug use period, increase the water exchange amount when spraying, avoid high temperature, windy weather, spray evenly on the ground, so as not to re-spray or leak. Use in strict accordance with the herbicide instructions to prevent the damage. Common herbicide 1, 40% acetic mu 150-200 ml of mixture A, watered 50-80 kg, maize sowing pre-emergence after spraying. 2 , 18-100 % of Yu Nong Le 80-100 ml per acre , 50-80 kg of water , sprayed in the 2-3 leaf stage of corn . 3 , 50% of the use of 50% of the A mixture of 150 liters of water 50-80 kg, directed spray before the corn 4 leaf stage.

2 , seedling pest control:

( 1 ) Laodelphax striatellus and aphids are poisonous insects of corn, which are sprayed with 10% imidacloprid 1000 times solution.

( 2 ), prevention and control of corn virus disease: in the corn one leaf and one heart period, the use of 1.5% plant disease II No. 800-1000 times liquid, spray once every 7-10 days, 2 times in a row , evenly spray on both sides of the leaves.

( 3 ) Pay attention to the occurrence of armyworms and prevent the biting of wheat. Since the armyworm is a migratory pest, it should pay close attention to its occurrence dynamics. Before the third instar of the armyworm larvae, when the corn heart leaves appear transparent small spots, the drug is controlled. Can use 25% chloridazole suspension or NPV virus preparation per acre 30 　 -50 grams, watered 40 - 50 kg of spray, but can also rid of caterpillars, bollworm and other pests. The spraying time should be based on the habit of the sticky insects, and it is chosen before 10 am and after 4 pm.