Corn is an important field crop in China, planted in both the north and the south. In the process of planting corn, some pests and diseases will inevitably occur, especially in the middle and late stages. This article will introduce in detail the prevention and control methods of pests and diseases in the middle and late stages of corn.
First, prevention and treatment of brown spot, top rot, sheath blight, stem rot, rust, large and small leaf spot disease and other diseases:
1. Agricultural control: removing the old leaves of the old leaves can reduce the humidity in the field and reduce the source of bacteria;
2. Chemical control:
Control brown spot, sheath blight, rust spray with water 20 ml of 20% triadimefon EC;
Diseases such as top rot, stem rot, large and small leaf spot can be sprayed with 50% carbendazim 500 times or 70% methyl thiophanate 800 times.
Second, the prevention and control of cotton bollworm, corn borer, armyworm, aphids, red spiders, sorghum and other pests:
1. Artificial control: After corn pollination, the ear worms at the 2nd and 3rd instars are concentrated at the top of the ears of the ears, the filaments are cut, and the filaments and larvae are taken out of the field for deep burial.
2. Chemical control:
Focus on the prevention and control of corn mash in the big bell period: 1.5-5% phoxim granules per acre or 0.5kg 3% kewei granules, put into the big cola bottle, tie 7-8 on the bottle cap a small hole, the heart to prevent;
Control cotton bollworm, armyworm, sorghum, corn borer, spray 3.5 ml of 3.5% chlorantraniliprole emulsifiable concentrate;
Control aphids with 10% imidacloprid 50 grams sprayed with water;
The control red spider was sprayed with water using 1.8% avermectin 50 ml.
Prevent once every 10 days, continuous control 2-3 times, can receive better results
1. Control with 90% trichlorfon 800 times droplets.
2, acre with 1% a vitamin salt microemulsion 20-30 ml or with 4.5% beta-cypermethrin EC 40-50 ml, 40-50 kg water, high rod spray or fog machine.
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