What are the methods for controlling rapeseed pests and diseases? A detailed explanation of the latest control techniques

Rapeseed, also known as oil cabbage and bitter cabbage, is one of China's important grain and oil crops due to the high oil content of its seeds, and is mainly distributed in Anhui, Henan, Sichuan and other places. However, during the rapeseed planting process, its resistance to pests and diseases is relatively weak, so strengthening the control of rapeseed pests and diseases is the key to increasing yield. So what pests and diseases does rapeseed have? How should they be controlled? Let's take a look together.

1. Sclerotinia rot

Sclerotinia rot can infect rapeseed from emergence to maturity, with the highest incidence rate especially during the flowering period, and the damage caused by sclerotinia rot is severe and widespread. When the disease occurs, it harms rapeseed stems, flowers, leaves and other parts; at the onset, light brown lesions appear on the affected parts, and as the disease develops they turn grayish-white. If field humidity is relatively high, the lesions may also develop rot, and a white mold layer will grow on the rotting areas.

Control methods: During the rapeseed flowering period, carry out intertillage and earthing up 2-3 times, which can promote rapeseed root growth and also prevent sclerotinia rot. After rain, drain water in time to reduce field humidity, reasonably control the fertilizer ratio, and spraying carbendazim during the flowering period can effectively control sclerotinia rot.

2. Downy mildew

Downy mildew mainly occurs under conditions of relatively high field humidity caused by long periods of cloudy and rainy weather, and mainly harms the leaves of rapeseed. When the leaves are affected, grayish-white or light yellow irregular lesions appear on the upper surface of the leaves. Once lesions appear, multiple lesions will develop and may connect with one another. In the later stages of the disease, the leaves will dry up and die over large areas.

Control methods: The control methods for downy mildew are similar to those for sclerotinia rot. Strengthen field management, increase the application of phosphorus and potassium fertilizers, enhance disease resistance, drain water in time after rain to prevent the spread of pathogens, and spray Anke mancozeb in the early stage of the disease for control.

3. Aphids

Aphids are one of the main insect pests harming rapeseed. They are found throughout China's main rapeseed production areas and are more rampant in dry winter environments or in soil lacking moisture. Aphids feed on the young and tender tissues of rapeseed. In addition to causing damage to leaves, they also leave behind their own secretions, greatly affecting plant growth. Moreover, aphids are also transmitters of many diseases, causing great harm.

Control methods: Aphid control should combine physical and chemical control. First, do a good job of intertillage; before flowering, carry out intertillage and earthing up, and maintain reasonable close planting to ensure field ventilation. When there are many aphids, spray pirimicarb water-dispersible powder granules for control, once every week, for 2-3 consecutive times, with good results.

4. Cabbage caterpillars

Cabbage caterpillars mainly cause damage as larvae, and the degree of feeding varies with growth instar. Third-instar cabbage caterpillars can eat an entire plant clean in a short time, causing great harm. If not controlled in time, the loss to rapeseed is extremely great. Somewhat similar to aphids, their feces can also affect rapeseed growth and harm the growth and health of the plants.

Control methods: For the control of cabbage caterpillars, manual collection can be adopted, and diseased leaves, old leaves and yellow leaves should be removed from plants in time. This can reduce the reproduction and food resources of cabbage caterpillars and reduce their damage.

The above is an introduction to the methods for controlling rapeseed pests and diseases. We hope it can help you. If you want to learn more related knowledge, please follow us.