Prickly ash rust is a prevalent disease, also known as the vulgar sheath rust, pepper rust. The incidence rate in epidemic years can reach 50%-100%, which can cause a large amount of pepper leaves to fall off soon after picking peppers, so that the pepper tree will re-emerged with new leaves. At the early stage of disease, immersed immersed water with a diameter of 2-3 mm appears on the surface of the leaf, and a round yellow-brown worm-like uredia spores appear on the back of the leaf corresponding to the lesion. A large number of small uredospores often appear around the larger uredospores, arranged in rings or scattered. When these pods break, orange powdered uredia spores are released. On the front of the blade at the onset of disease, the chlorotic spot develops into a 3-6 mm dark brown necrotic spot. The base of the dorsal uredospore heap produces a brown or orange waxy teliosporite heap that does not rupture and is round or oblong, arranged in a ring or scattered. Severe incidence, there are also on the petiole uredia spores and teliospore heap. The disease is caused by the infection of the sheath rust of the pepper sheath. The pathogen is basidiomycotina, rust, rust, and rust. Pfeiffer has been planted in pepper-growing areas in Gansu, Shaanxi, Shandong, Shanxi, Hebei, Henan and Sichuan. The disease usually begins in late June and early July and early September. In the case of heavy rainfall, especially in the autumn when rainfall is heavy and rainfall is frequent, the disease is easily prevalent. Most of the disease occurred from the lower leaves of the canopy and spread from the lower part to the upper part. The diseased leaves of the Zanthoxylum bungeanum fruit had a large amount of shedding before it matured. By the end of October, all the diseased leaves had fallen and the new leaves had gradually grown. The occurrence of the disease is related to the topography of the garden, and the incidence of sun-poor slopes is lighter than that of the sunny slopes. Dahongpao has the heaviest incidence, followed by bean pepper, and the peppers are more resistant to disease. In addition, if high-stalk crops are planted between the rows of pepper trees, the disease can be aggravated by poor ventilation and light transmission. To prevent and treat the disease, one is manual control. 1 Cultivation of disease-resistant varieties. It can be mixed with disease-resistant varieties such as dog pepper and Dahongpao. It is also possible to cultivate resistant varieties by asexual propagation or grafting. 2 Strengthen fertilizer and water management, increase tree vigor, and increase the resistance of pepper trees to their own diseases. 3 thoroughly clean the garden. After the pepper has fallen into the fallen leaves, the diseased leaves will be cleaned and burned in a concentrated manner to thoroughly eliminate and destroy the overwintering pathogens. The second is chemical control. From the beginning of July to the end of July, use 25% propiconazole EC 1000-1500 times, 15% triadimefon WP 800-1200 times, 12.5% ​​diniconazole wettable powder 600-800 times, 50% Tuzifa wettable powder 600-800 times, or 20% triadimefon emulsion 1500-2000 times, spray once every 15-20 days, even spray 2-3 times. 2 After the autumn fruit is harvested, the prickly ash tree can be sprayed 1:2:600 times Bordeaux mixture (500 g of copper sulphate, 1,000 g of lime, 300 kg of water) before the germination of pepper buds in the following spring to kill the tree. Parasitic germs prevent bacteria from invading late autumn and early spring and prevent the infection and spread of germs. 3 Remove defoliated weeds in time, concentrate burning and reduce the source of bacteria. Shower Gel,Shower Cream,Shower Foam,Body Shower Gel Wuxi Keni Daily Cosmetics Co.,Ltd , https://www.wxkenidaily.com