Kidney bean heart leaf shrinkage suspected acetochlor drift harm
Recently, many readers in Taizhou, Rudong, and Gaoyou visited the region to report symptoms such as leaf shrinkage in local crops such as kidney beans. They asked about the causes and sought countermeasures.
On June 21, Shuai Wenwen, Bao Xuzhen, Hailing District, Taizhou City, came to the telephone and said that many fields of cowpea in the local area had the symptoms of leaf rewinding, thickening, and shrinkage, and the field disease rate was 100%. It is understood that before the above symptoms of cowpea, acetochlor was sprayed on the nearby plots.
On June 22nd, Ding Jianping of Xindian Township in Rudong County came to the telephone and said that there were many fields where the young leaves of cowpea shrunk and the diseased plant rate reached 100%. It is understood that there are no other diseases in the plant, and no insects such as locusts are found in the field.
On June 23, Jiang Wei of Sancha Township of Gaoyou City came to the telephone and said that the locally grown cowpeas generally experienced yellowing and dwarfing. The rate of diseased plants reached 100%. After the onset of the disease, there were no signs of improvement with the use of too many ketones, acephate and other drugs. Liu Baoguo, from Yokohama Town, Taixing City, came to the telephone and said that locally grown cowpeas had a tendency to distort the heart and leaves a few days ago. The old leaves of the lower part grew normally and the rate of diseased plants reached 100%. The cowpea was 1.2 meters long when it was onset and no harmful insects were found.
On June 24, Ren Naihong from Yuanzhuang Town, Rudong County, said on the phone that the top leaves of crops such as cucumbers and cowpeas had shrunk, but the lower leaves had normal growth. The disease began one week ago and the diseased plant rate reached 100%. It is understood that acetochlor was sprayed on the surrounding soybean fields not long ago.
Crops such as kidney beans are affected by virus diseases and herbicides such as acetochlor. Due to the low number of insecticidal insects such as locusts in the above-mentioned fields, and the shrinkage of the heart and leaves of the plant, there are no symptoms such as mosaics, and it is basically possible to rule out the possibility of transmission of viruses such as locusts and insects.
Before and after wheat harvest, it is the season of sowing soybeans, summer corn and other crops. These crops often use acetochlor and other herbicides to seal the soil. If mist sprayers are used to apply drugs, drug drops tend to drift, causing drift hazards to sensitive crops in the surrounding plots. In particular, when the wind is large, the pesticides drift farther away. Sometimes there are watermelons other than white rice. Kidney beans and other sensitive crops produce phytotoxicity. Kidney beans were harmed by acetochlor, which showed slow growth, the upper leaves were shriveled, and the vine growth period was prolonged, and the scab period was delayed by 10 to 15 days. Watermelon was harmed by acetochlor and showed dwarfing of plants, thin and short branches, leaf shrinkage, and small and late melons. In recent years, crops such as cowpea have suffered from acetochlor. Some time ago, the Central and Central Plains of Jiangsu Province were in the period of concentrated treatment after summer maize and summer soybean sowing. Sensitive crops such as cowpea appeared to have normal leaf shrinkage and old leaves, which may be caused by acetochlor migration injury. .
The field where acetochlor is harmed is sprayed as early as possible to spray Nian'an, Jiexue Dian and Bicao 0.136% erythrochlorethyl bromide wettable powder, etc., and appropriate spraying of humic acid foliar fertilizer will help reduce the harm of pesticides. To promote crop recovery. In the future, it is necessary to avoid spraying acetochlor on windy days, and to choose environmentally friendly, efficient, low-volume, anti-drifting plant protection machinery.
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