What's wrong with the curly leaves of the beans in the farmer's house without pesticide?

From the performance of beans in the photo, it is considered to be the problem of bean leaf roller or herbicide pollution, and the specific reason can be judged according to the local situation. For example, check to see if there are leaf rollers or eggs behind the leaves, and then check to see if other neighbors around the beans have recently been sprayed with herbicides, make further diagnoses, and then take specific measures!

Next, let's introduce the measures in detail.

Control of leaf roller, Chilo suppressalis

Leaf rollers generally wrap themselves inside the leaves after the leaves are curled, and weave cobwebs on the back of the leaves to protect them from being pecked by other beneficial insects. Therefore, it is also relatively difficult to prevent and cure it, and the spray may not be effective because the drug cannot penetrate the back. Although manual hunting is also a means, but it is still relatively difficult, if pests are rampant, this measure is obviously not feasible.

Generally speaking, strong insecticides are used to control these pests, such as 2.5% permethrin EC 3000 times, 10% cypermethrin EC 2500 times, 20% fenvalerate 1500 times, 48% Lexben EC 1000 times or 30% acephate 1000 times 1500 times, spray control.

In the stage of flooding of diseases and insect pests, spraying once a week and twice in a row can basically eliminate pests.

Herbicide harm

For herbicide damage, Huang-Huai-Hai area basically occurs in the sowing period of corn after wheat harvest, which is usually caused by herbicide spraying in adjacent plots and drifting to beans.

First of all, if beans are just harmful or at the initial stage of herbicide harm, rinsing with clean water can be taken to reduce the harm of herbicide. However, the effect of this method is relatively small, from the photos, it has been harmful for a while, so it is difficult to achieve good results even if you choose to spray water dilution herbicide. And current herbicides basically work in 24 hours.

Secondly, after being damaged by herbicides, we can actively apply fertilizer and water to promote the growth of beans and improve the resistance of beans to drug damage.

However, although the above methods can play some methods, but it is still relatively mild, the best way is to spray some humic acid or brassin, diluted by 7500 times, plus some foliar fertilizer, spray once a week after the drug damage, continuous spraying 2-3 times can basically relieve the drug damage.

The above are some views on bean curling that Science Xingnong has shared for you. I hope it will be helpful to you.