According to a farmer friend in Shuyang County, Jiangsu Province, it is not known whether the control of cornfield ash can not be used with buprofezin and zhongdingwei. Will it cause phytotoxicity? In response to this question, the China Pesticide Network has compiled relevant information to reveal the answer for you:
It is understood that the damage of Laodelphax striatellus to corn is mainly to spread the crude disease virus. Since maize has adult-stage resistance to rough disease, resistance is usually enhanced after the 9-leaf stage, even if it is affected by infection. Therefore, the prevention and control of corn rough disease should adhere to the focus on adjusting the sowing date to avoid disease, and adapt to the local conditions to plant disease-resistant varieties and scientific control of Laodelphax striatellus as a supplement to comprehensive measures of avoidance, tolerance and treatment.
The use of pesticides to control Laodelphax striatellus is one of the effective measures to control the occurrence of corn rough disease. Before and after the wheat harvest, the adult larvae are in the prosperous period, and a large number of adults migrate to the corn field. At this time, it is a key period for the corn field to control the locusts. The pesticides with good quick-acting and effective insects should be selected. A drug that lasts for a period of time. The drug can be selected from the group consisting of pymetrozine, rice flour, chlorpyrifos, isoprocarb, zhongdingwei, beta-cypermethrin. It is worth noting that when organophosphorus and pyrethroid pesticides used in corn fields are used to control Laodelphax striatellus, the concentration of the liquid should be strictly controlled, otherwise it may cause phytotoxicity. Generally, 50% of rice granules use 1000~2000 times of liquid; 48% of chlorpyrifos emulsifiable concentrate uses 2000 times of liquid, the dilution factor should not be less than 1000 times; pyrethroid pesticides generally use 2000~3000 times of liquid. Dichlorvos, phoxim and fenvalerate are prone to phytotoxicity on corn and should not be used.
Buprofezin has also been used to control Laodelphax striatellus in the past years. However, according to the identification of the Plant Protection Institute of Jiangsu Academy of Agricultural Sciences, due to its frequent use, the Laodelphax striatellus in Jiangsu and other places has developed strong resistance to buprofezin. This medicine can no longer be used to control Laodelphax striatellus. The pesticide network reminds everyone that in production, care should be taken to avoid drug abuse. It is best to use it alternately with other different types of drugs to delay the development of drug resistance.
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