Spring carrots are usually planted in late March and harvested from July to August. Now is the time when carrots are growing vigorously, and timely prevention and control of pests and diseases is conducive to the high yield and income of carrots.
1. Prevention and control of soft rot. The first thing to do is to rotate and choose the place of birth. Then you have to ridge and drain well after the rain. Second, the application of decomposed organic fertilizer reduces the sources of underground pests. Finally, once the onset of the disease, the diseased plant should be pulled out and the diseased area treated with lime. In addition, the initial stage of disease can be sprayed with agricultural streptomycin 4000 times solution or 50% ampicillin copper wettable powder 500 times solution, or 77% can kill 2,000 dry suspension agent 400 times to root control.
2, the control of black spot. First of all, it should be a rotation. The seeds are then sterilized and can be seeded with a seed weight of 0.3% of 50% Formamide WP or 70% mannax WP. Secondly, appropriate irrigation is added to promote growth and enhance resistance to disease. Finally, pay attention to the removal of the diseased body; spray 75% chlorothalonil wettable powder 600 times, or 50% thiophanate-methyl 500 times, or 50% acetaminophen wettable powder 1000-1500 times, etc. .
3, prevention and control of cockroaches and earthworms. First of all to use fully decomposed organic fertilizer, conditional blacklight traps can be set to kill adults. Secondly, if irrigation is properly conducted and the eggs are not allowed to hatch under conditions that are too dry or too wet, the larvae will die, and the adult reproduction and viability will be affected. Finally, the bait can be killed by poisoning, with 90% trichlorfon 30 times 0.15g, mixed with sauteed wheat bran 5kg made bait, mulching per mu aquifer 1.5-2.5kg; or 90% trichlorfon EC 800 times Liquid irrigation roots, each strain 0.15-0.2kg liquid.
4. Control of whitefly and aphids. Spray 25% Pucarbirax 2000 times, or 10% imidacloprid WP 2000 times for control.
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