How to control strawberry anthracnose when the stem turns brown and the whole plant dies?

Anthracnose mainly damages strawberry stolons, leaves, flowers and fruits. The optimum temperature of the disease is about 30 ℃, which is a typical high temperature disease. The symptoms can be divided into local disease spot and whole plant wilting. Strawberry stolon and petiole disease, the growth of nearly black oblong local disease spot, the disease spot is ulcerated, sunken, when the humidity is high, the disease spot is dense with flesh mold. In the early stage of the disease, only 1-2 young leaves wilted and drooped during the day and recovered in the evening, but withered after a few days, the disease-free new leaves remained green, the stems of dead strawberries gradually turned brown from outside to inside, and the vascular bundles did not change color.

Strawberry

Incidence regularity: the pathogen of strawberry anthrax ice belongs to semi-knowing subphylum, Alternaria. The pathogen overwinters in the soil with the remains of strawberry disease. Conidia are produced in the high temperature season from July to September, which are transmitted by wind and rain and infected. When the disease is serious in continuous cropping land, there are many old residual leaves, overgrown plants, too dense planting and poor ventilation, the disease is easy to occur.

Control methods: ① selected new star, Dasai Lecter, Baojiao Zaosheng and other resistant strawberry varieties, Lihong, Fangyu and other varieties were susceptible to disease; ② seedling nursery, pseudo-planting nursery rotation, strengthen strawberry plant and stolon management, timely removal of diseased leaves, diseased stems, withered old leaves and other diseased remains At the initial stage of the onset of ③, 2% Wuyisin water agent was sprayed with a concentration of 5 ml /-Yl-,7~10 once a day for 2 times, and the control effect was good; ③ chemical control. In the strawberry stolon growth period, the strawberry stolon can be sprayed with 75% chlorothalonil 600 times, or 2% agricultural antibiotic 120 water agent 200 times, or 50% dimethane 500 times 800 times for control. Or 80% anthrax, Fumi 500 times, 600 times, and so on.