Recently, many growers have responded. After the green peppers enter the young fruit stage, some of the ears appear black and fall off. Physiological fruit drop, aphids and anthracnose can cause the ears to turn black. Today, the small series of Huinong.com will introduce the prevention and treatment methods of green pepper anthracnose.
First, the symptoms of harm
Green pepper anthracnose is commonly known as black fruit disease, which mainly harms the fruit, leaves and young shoots of green pepper. In severe cases, a fruit can reach 3-10 lesions, which is easy to cause fruit loss, generally reducing yield by 5%-20%, even up to 40%. At the beginning of the disease, the fruit showed irregular small brown spots. In the mid-stage, the lesion gradually becomes round or nearly circular, with a central depression, dark brown or black. When the weather is dry in the late stage of the disease, the center of the lesion is gray or grayish white, and there are many small black or brown spots arranged in a wheel pattern. In the case of high temperature and rainy weather, the small black spots on the lesions show pink small protrusions. The disease can be spread from the fruit to the new shoots and young leaves. In severe cases, the whole ear becomes black, which affects the yield and quality of green pepper.
Second, the law of incidence
The bacteria overwinter on the diseased fruit, diseased leaves and branches with mycelium or conidia. At the beginning of May of the second year, spores, wind, rain and insects are transmitted when temperature and humidity are appropriate, causing diseases. Can cause multiple infections. The onset of the disease begins in late May to early July, and peaks in June.
The poor ventilation and light transmission of the pepper garden, the weak tree, and the high temperature and high humidity are conducive to the occurrence of anthrax. The bacteria are overwintered on the diseased fruit, diseased leaves and branches by mycelium or conidia. When the temperature and humidity are suitable, conidia are produced, which are transmitted by wind, rain and insects. The pathogen can infect multiple times each year.
Third, prevention and treatment methods
1. Physical methods: strengthen the management of pepper garden, deep tillage and soil, timely drainage after rainfall, improve the growth potential of pepper trees, enhance disease resistance; timely remove diseased bodies and enhance the ventilation and light transmission of pepper garden.
2, chemical control: in the early stage of the disease with 25% prochloraz 10ml +37% difenoconazole 5g + 80% mancozeb, or 25% prochloraz 10ml +37% difenoconazole 5g + 75% chlorothalonil 20g with water 30 kg, foliar spray for 2-3 times, can effectively control the occurrence and spread of disease, and can be combined with fruit preservation and strong fruit at the same time.
Green pepper anthracnose is not terrible. Only timely prevention and treatment can be remedied to minimize the impact of anthracnose on the yield of green pepper.
Changzhou Ziying Metal Products Co., Ltd , https://www.ziyingmetal.com