Control methods of diseases and insect pests in rapeseed

Rape, also known as Chinese cabbage and sowthistle, is one of the most important grain and oil crops in China because of its high oil content, mainly distributed in Anhui, Henan, Sichuan and other places. However, in the process of rape planting, the resistance to diseases and insect pests is weak, so strengthening the control of rape diseases and insect pests is the key to improve the yield. So what are the diseases and insect pests of rape? How to prevent and cure it? Let's take a look.

1. Sclerotinia disease

Sclerotinia sclerotiorum can be infected from emergence to maturity, especially at flowering stage. Sclerotinia sclerotiorum has great harm and wide range. When the disease occurs, it will harm rape stems, flowers, leaves and other parts, and light brown spots will appear at the onset of the disease, which will become grayish white with the development of the disease. If the field humidity is high, the disease spot will also appear festering phenomenon, and fester will also grow white mold layer.

Control methods: cultivate the soil 2-3 times during the flowering stage of rape, which can promote the growth of rape root system, prevent Sclerotinia sclerotiorum, drain in time after rain, reduce the humidity in the field, and control the proportion of fertilizer reasonably. spraying carbendazim at flowering stage can effectively control Sclerotinia sclerotiorum.

2. Downy mildew

Downy mildew mainly occurs in the case of high humidity in the field caused by long-term overcast and rainy weather, which mainly harms the leaves of rape. When the leaf disease occurs, the leaf front will appear gray-white or light yellow irregular disease spot, once the disease spot appears, there will be multiple disease spots, and there will be interconnection, in the later stage of the disease, the leaf will die in a large area.

Prevention and control methods: the control method of downy mildew is similar to that of Sclerotinia sclerotiorum, strengthen field management, apply more phosphorus and potassium fertilizer, enhance disease resistance, timely drainage after rain to prevent the spread of bacteria, and can be sprayed with Anke manganese zinc at the initial stage of the disease.

3. Aphids

Aphids are one of the main insect pests that harm rape. It spreads all over the main producing places of rape in China and is rampant in dry environment or soil without water in winter. Aphids will nibble on the young tissue of rape, which will not only cause damage to leaves, but also leave their own secretions, which have a great impact on plant growth. And aphids are also the disseminators of many diseases, which do great harm.

Control methods: aphid control should be combined with physical control and chemical control, first of all, we should do a good job of intertillage treatment, ploughing and cultivating soil before flowering, reasonable close planting to ensure the permeability of the field. When there are a large number of aphids, aldicarb water powder granules can be sprayed every other week, continuous 2-3, the effect is better.

4. Green worms

Green insects are mainly harmed by larvae, and the degree of eating varies according to different growth ages. The third instar green insects will eat the whole plant clean in a short time, which will do great harm. If not controlled in time, it will cause great losses to rape. Similar to aphids, its feces can also affect the growth of rape and endanger the growth and health of plants.

Prevention and control methods: for the prevention and control of green insects, artificial capture methods can be collected to remove diseased leaves, old leaves and yellow leaf plants in time, which can reduce the reproduction and edible resources of green insects and reduce the harm of green insects.

The above is the introduction of rape pest control methods, hope to help you, want to know more related knowledge, please pay attention to us.