In different periods of corn, pests and diseases occur it is not the same, so late in the main pesticides to control pests and diseases which have the following tips in mind: Stop Valves are closed by screwing a rubber gasket down onto a seat in the middle of the valve. Pros only use small versions that act as shutoff valves for fixtures such as sinks and toilets and outdoor sillcocks. Flow is inefficient because of the circuitous route the fluid (water, in most cases) has to follow. It's important to orient the valve in the right direction with the arrow (cast into the side of the valve) aligned with flow direction. That way, water flows against the bottom of the rubber gasket. If the valve is put in backward, the flow will force the gasket away from the top of the valve. Stop Valves, Shower Stop Valve, Water Stop Valves, Brass Stop Valve ZHEJIANG KINGSIR VALVE CO., LTD. , https://www.kingsirvalves.com
Aphids use 50% anti-Pulcan WP 8-10 g per mu, or 10% imidacloprid WP 10-15 g, and 45 kg spray to prevent and control.
Corn glutinous rice in the small trumpet period of corn, with 3% phoxim granules 0.5 kg per acre mixed with fine sand 7.5 kg, mixed and then sprinkled into the heart leaves, 1.5 to 2 grams per plant; or in the ears of silk 6 to 8 days after the start, spray control with 4.5% beta-cypermethrin EC or Kungfu 2.5% lambda-cyhalothrin 1500-2000 times.
The armyworm is sprayed with 25% diflubenzuron suspension or 4.5% beta-cypermethrin EC 1500-2000 times.
Helicoverpa armigera is sprayed with 4.5% beta-cypermethrin EC or Kungfu 2.5% lambda-cyhalothrin 1500-2000 times.
Pesticide control techniques for major pests and diseases in the middle and late stages of maize growth