As an important oil crop and cash crop in China, rapeseed has always been the target of many farmers, but there are many pests and diseases in rapeseed, so what are the common pests and diseases of rapeseed? How do we need to prevent it?
1. Downy mildew
The incidence of downy mildew is high. After the onset, the pedicel is swollen and curved, and the petals become thick and thick, and the white is similar to moldy substances. At the beginning of the disease, small green spots grow on the leaves, and then gradually expand the color to yellow, and white mold spots grow on the back of the leaves. If you encounter rainy and humid weather, and the temperature is high and low, it is very easy to get sick.
If you want to prevent it, you need to know the symptoms of early onset. If you find that the flower branch is swollen, you should trim it immediately and take the affected part away from the field. The planting area needs to dig a deep ditch to facilitate drainage to avoid the soil being too humid, and often cultivating loose soil to reduce the bacteria, and often killing the medicinal agents.
2, sclerotinia
Sclerotinia sclerotiorum is more common, the symptoms are as follows, the stem will grow light brown spots, and then develop into long strips. After the onset of the leaf parts, various irregular lesions will appear, which are easy to perforate, and the petals are infected. Change, gradually appear white, and then begin to rot.
If symptoms are found, the medicine should be sprayed in time. If the symptoms are more serious or the environment is damp, the number of medications can be increased.
3, cabbage caterpillar
Cabbage caterpillar is one of the common pests, causing great harm. If it grows on rapeseed, it will feed on the leaves. The larvae usually appear on the back of the leaves, gradually eating the leaves, leaving only the epidermis, accompanied by the development of the insects. Crop impacts will also grow.
If you want to control cabbage caterpillars, it is best to find the symptoms at the young age of the larvae. At this time, the eggs are orange-yellow, and it takes only two or three days to grow larvae, which needs timely observation by growers and early Use medicines.
4, locusts
If aphids appear on the rapeseed, they will absorb the leaves and leaves in the crop, especially if the insects like to gather on the leaves. Early leaves begin to yellow and curl, and if not treated in time, the situation will become more and more serious, and the leaves will wither and die.
After flowering, the aphids will also cause falling flowers, the whole plant will be yellow, the yield will be affected, and the aphids will easily carry viral diseases. The use of related drugs before the planting can play a preventive role. If the early treatment can inhibit the aphid outbreak and spread, the silver-gray film can be used to repel the spraying process.
5, locust
Leafhoppers are also frequently found on rapeseed, and they tend to eat leaves, both in the larval stage and in the adult stage, often in large quantities, which have serious effects in a short period of time. If you want to prevent and cure the diseased leaves and dead branches in the field, you should be diligent in management and find out the weeds in time to eliminate some of the insect sources. Because this kind of insect has the habit of suspended animation, it can be artificially smashed and smothered. It is necessary to use the medicine immediately during the incubation period, but it should not be used excessively.
The above are the five common pests and diseases that are common when planting rapeseed. Farmers must manage with care, find out in time, prevent and control as soon as possible, and hope to help farmers.
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