How to control virus disease of pepper

Pepper virus disease has a wide range of disease, the harm is extremely serious, light yield reduction of 20-30%, serious loss of 50-60%, is one of the common and important diseases in pepper cultivation.

Pepper virus disease

Harmful symptoms: 1. Mosaic type, diseased pepper leaves appear yellow and green flower spots, wrinkles, or brown necrotic spots. two。 Leaf deformity or cluster type, at the beginning of pepper heart leaf veins turned green, forming uneven mottle, leaf surface wrinkling, later diseased leaves thickening, yellow-green mottled or large yellow-brown necrotic spots, leaf edges curled upward. The young leaves were narrow and linear when they were severe, and the upper internodes of pepper were shortened in clusters in the later stage. The seriously diseased fruit has green uneven spots and verrucous protuberances. 3. Stripe type, pepper leaf main vein is brown or black necrosis, along the petiole to the lateral branches and main stem, necrotic stripe, resulting in early defoliation, flower drop, fruit drop, serious, the whole plant withered.

Incidence regularity: pepper virus disease is mainly caused by cucumber mosaic virus and tobacco mosaic virus. Cucumber mosaic virus has a wide range of hosts, and many vegetable crops are militarily transmitted mainly by aphids (beech aphids, etc.). Tobacco mosaic virus can survive for a long time in the residual branches of dried pepper plants, and it can also be infected by seeds and transmitted through sap contact. The harm of cucumber mosaic virus is also serious when high temperature and drought and aphids are serious. Continuous cropping for many years, low-lying land, lack of fertilizer or application of immature organic fertilizer can aggravate the harm of tobacco mosaic virus.

Prevention and control methods: 1. Disease-resistant pepper varieties such as Zhongjiao 2, Tianza 2, Shuangfeng, Zhongjiao 4, Zaofeng 1, Sujiao 2, Sujiao 3 and Nongfa were selected. two。 Clean the countryside, avoid repeated cropping, and rotate with onions, garlic, legumes and cruciferous vegetables for 3-4 years. 3. Silver gray film was used to avoid aphids and yellow board was used to trap aphids. 4. In the early stage of chemical control, we should focus on the control of aphids and reduce the transmission vector (vegetable aphid control). 5. Cultivate strong seedlings, cover plastic film, plant in time, strengthen the management of water and fertilizer, and enhance the disease resistance of pepper plants.