What are the methods for controlling pests and diseases in summer corn at the seedling stage
Which pests and diseases need to be controlled in summer corn at the seedling stage? Please introduce the control methods. The following pests and diseases need to be controlled in summer corn at the seedling stage: 1. Seedling-stage pest control. The main pests at the corn seedling stage are: armyworm, cotton bollworm, small brown planthopper, thrips, Swedish fly, etc. To control armyworm and cotton bollworm, 5% beta-cypermethrin or 2.5% cyhalothrin 50-75 g/mu can be used, sprayed with 30 kg of water. For the control of Swedish fly, when corn has just emerged (i.e. one leaf and one heart), spray 15% beta-cypermethrin·chlorpyrifos emulsifiable concentrate 50 mL per mu. If damaged plants appear in the field, those with severe damage should be pulled out promptly, and for lightly damaged ring-shaped plants, the tip of the plant should be cut off. To control the grain mealybug, use 50% phoxim emulsifiable concentrate 500-1000 mL/mu or 48% Lesiben emulsifiable concentrate 200-400 mL/mu for root drenching.
Which pests and diseases need to be controlled in summer corn at the seedling stage? Please introduce the control methods
The following pests and diseases need to be controlled in summer corn at the seedling stage:
1. Seedling-stage pest control. The main pests at the corn seedling stage are: armyworm, cotton bollworm, small brown planthopper, thrips, Swedish fly, etc. To control armyworm and cotton bollworm, 5% beta-cypermethrin or 2.5% cyhalothrin 50-75 g/mu can be used, sprayed with 30 kg of water. For the control of Swedish fly, when corn has just emerged (i.e. one leaf and one heart), spray 15% beta-cypermethrin·chlorpyrifos emulsifiable concentrate 50 mL per mu. If damaged plants appear in the field, those with severe damage should be pulled out promptly, and for lightly damaged ring-shaped plants, the tip of the plant should be cut off. To control the grain mealybug, use 50% phoxim emulsifiable concentrate 500-1000 mL/mu or 48% Lesiben emulsifiable concentrate 200-400 mL/mu for root drenching.
2. Seedling-stage disease control. The main seedling-stage disease is corn rough dwarf disease. Rough dwarf disease is transmitted by the small brown planthopper, so insect control should be done well to prevent the disease. To prevent viral disease, insecticides can be sprayed on the grassy edges of fields before sowing or before emergence, using imidacloprid spray. At the one-leaf-one-heart stage of corn, spray 20% Virus A wettable powder at 500 times dilution plus 10% imidacloprid 30 g/mu, once every 7-10 days, for 2-3 consecutive sprays; in addition, agricultural control measures such as pulling out diseased plants and retaining healthy plants can be taken during thinning and final singling.
3. Weed control:
For field edges, furrows and other places where weeds have already emerged and grown large and are dense before sowing, non-selective herbicides such as Gramoxone (paraquat) or glyphosate can be used for spot spraying; for soil treatment after corn sowing and before emergence, 40% acetochlor·atrazine 200 g per mu, or 50% isopropylamine·atrazine 200 g, etc. can be used, sprayed with 40-50 kg of water; from corn emergence to the 7-leaf stage, when weeds are at the 2-5 leaf stage, use 4% nicosulfuron 90-100 g per mu, sprayed on stems and leaves with 30-50 kg of water. Note that organophosphorus pesticides must not be used within 7 days before and after application of post-emergence corn herbicides, to avoid phytotoxicity.
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