Dry leaf deformity appeared in the beans near the corn field, which was caused by the spraying of herbicide drift in the corn field. Spraying herbicides in corn fields is mainly affected by wind, and the wind is farther away. Many vegetable farmers regard this medicinal disease as a disease prevention and control, which not only fails to achieve the proper control effect, but also delays the timing of prevention.
The symptoms are as follows: After spraying the herbicide in the corn field, the old leaves of the beans are dry and the stems are still green. With the growth of the beans, the new leaves are deformed and the leaves are shrunk. If the beans are in the pod-forming period, falling flowers appear. Plant growth is poor, which seriously affects yield.
There are several methods of prevention and treatment:
Flushing: The period during which the farmer sprays the herbicide is generally 7 to 10 days. During this period, the bean leaves are often sprayed with water to reduce the residual amount of the herbicide on the bean leaves. Timely topdressing: Topdressing is mainly based on ammonium bicarbonate or urea, and it can also be combined with some phosphorus and potassium fertilizers. The amount of top dressing should be determined according to the severity of the phytotoxicity and the growth of the beans.
Sufficient watering: timely watering after topdressing to promote fertilizer efficiency and reduce the relative concentration of harmful substances in the beans. Foliar application of plant growth regulators and foliar fertilizers: the effect of the mixture of 7500 times of liquid and foliar fertilizer is better. According to the degree of phytotoxicity, spray once every 10 to 15 days, and spray 1 to 3 times.
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