What causes leaf curling in peanuts? An analysis of the latest causes
The peanut is a very popular food and oil crop, and its market in China is very large. When we grow peanuts, the peanut plants often develop many problems that affect their growth. Peanut leaf curling is one of them, and peanut leaf curling not only affects the growth of the plants, but also leads to a drop in yield. So what causes peanut leaf curling? And how should it be prevented and controlled? Let's take a look together below!
1. Causes of leaf curling
There are many causes of peanut leaf curling, and the most common one is damage from various insect pests. For example, leaf roller worms, red spider mites and others are all major pests that cause peanut leaf curling. When growing peanuts, many growers use some pesticides for prevention and control in order to do a good job of preventing and controlling pests and diseases. If pesticides are used improperly, they can also cause peanut leaf curling, for example the use of some herbicides, MCPA and similar agents. Finally, there is the factor of disease: after scab disease develops, the peanut first shows the phenomenon of leaf curling.
2. Symptom expression
After peanut leaf curling occurs, it is very easy to see, and the target of the damage and disease of leaf curling is of course the leaves. After the leaves are damaged, many yellow-brown spots appear on the leaves, and the spots are also accompanied by a raised appearance. If the disease is relatively severe, then the damaged leaves will become smaller and narrower and so on, and sometimes they will also show curling and wrinkling and similar phenomena; in severe cases the plants wilt and drop off. This seriously affects the photosynthesis of the leaves, causing the peanut plants to accumulate insufficient photosynthetic material, and both the yield and the quality of the pods will decline.
3. Prevention and control measures
Agricultural control
Peanuts are not suitable for continuous cropping, so we must pay attention to doing a good job of crop rotation. When rotating crops, it is best to be able to carry out paddy-upland rotation, for example with rice and so on, which can effectively prevent leaf curling. If it is dryland rotation, then the rotation crops should be chosen from food crops such as soybean and corn. When selecting peanut varieties, give priority to those with strong disease resistance, to ensure the disease resistance of the peanut plants. Before planting, do a good job of soil improvement and fertilization, apply fully decomposed farmyard manure, improve the soil, raise the quality of the soil, and reduce the leaf curling phenomenon.
Chemical control
We should often observe the growth of the peanut plants, and when the leaf curling phenomenon is found. Timely spray the corresponding agent, for example, copper-ammonia solution can be used to spray the diseased plants and the healthy plants around the diseased plants, with the amount of solution per plant kept at about 250 grams. During the peanut growing period, agents such as Huasheng Bingjue can be used for spraying, about once every half a month. Then we must also do a good job of preventing and controlling insect pests, such as leaf roller moths, thrips and so on. Agents such as dimethoate and imidacloprid can be used for spraying control, to enhance the plant's resistance to pests and diseases.
The above is a brief introduction to what causes peanut leaf curling. That is all for today's introduction. This article is for reference only, and I hope it can help everyone!