First of all, pruning should be avoided in the morning when the greenhouse is not wet before ventilation. Under normal circumstances, the shed has not been ventilated before 9:00 in the morning, and the humidity is relatively high. If the whole stalk smashes at this time, the wound is difficult to dry and is susceptible to bacterial diseases. Therefore, pruning is best done in the morning after ventilation.
Second, pruning should be avoided during rainy days. The humidity in the rainy days of the greenhouse is high for a long time, and it is most likely to cause the epidemic of bacterial diseases. If the pruning occurs during this period, the wounds left are extremely susceptible to disease. Therefore, be sure to choose sunny weather when pruning vegetables.
In the end, pruning should be avoided immediately after watering. After 1 to 2 days after watering, the humidity in the shed is usually larger, which is also not good for pruning. It is best to dry the shed within 3 days after watering. In addition, we must also pay attention to spray the protective fungicide, such as 72% of the agricultural streptomycin 3000 times, 75% of the chlorothalonil 600 times mixed with copper citrate copper (DT) before the pruning. ) 500 times liquid, etc., can effectively prevent disease outbreaks, so as to take preventive measures.
Cypermethrin
It is a synthetic pyrethroid used as an insecticide in large-scale commercial agricultural applications as well as in consumer products for domestic purposes. It behaves as a fast-acting neurotoxin in insects. It is easily degraded on soil and plants but can be effective for weeks when applied to indoor inert surfaces. Exposure to sunlight, water and oxygen will accelerate its decomposition. Cypermethrin is highly toxic to fish, bees and aquatic insects, according to the National Pesticides Telecommunications Network (NPTN). It is found in many household ant and cockroach killers, including Raid and ant chalk.
Agricultural
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