Strawberry anthracnose causes stems to turn brown and the whole plant to die. How can it be prevented and controlled?

    Anthracnose mainly damages strawberry runners, leaves, flowers and fruits. The optimum temperature for the disease is about 30°C, making it a typical high-temperature disease. The symptoms can be divided into local lesions and whole-plant wilting. When strawberry runners and petioles are affected, nearly black oblong local lesions appear; the lesions are canker-like and sunken, and under high humidity they are densely covered with flesh-colored mold. In the whole-plant wilting type, in the early stage of the disease only 1 to 2 young leaves wilt and droop during the day and recover in the evening, but after a few days the plant dies. New leaves without the disease remain green, and the stems of the dead strawberry plants gradually turn brown from the outside inward, while the vascular bundles do not change color.

Strawberry

    Disease pattern: The pathogen of strawberry anthracnose belongs to the Deuteromycotina, genus Colletotrichum. The pathogen overwinters in the soil with strawberry diseased residues. In the high-temperature season from July to September, it produces conidia, which spread by wind and rain and cause infection and disease. The disease is severe in continuous cropping land, and it occurs easily when there are many old and residual leaves, plants are leggy, planting is too dense, and ventilation is poor.

    Prevention and control methods: 1) Select disease-resistant strawberry varieties such as Xinmingxing, Darselect and Hokowase; varieties such as Lihong and Fangyu are susceptible; 2) Rotate the nursery and temporary planting beds; during the seedling-raising period, strengthen the management of strawberry plants and runners, and promptly remove diseased leaves, diseased stems, dead old leaves and other diseased residues; 3) In the early stage of the disease, spray with 2% Wuyi mycin aqueous solution at a concentration of 5 ml/-Yl-, once every 7 to 10 days, for 2 to 3 consecutive sprays, with good control effect; 3) Chemical control. During the strawberry runner growth period, spray 75% chlorothalonil 600-fold solution, or 2% Nongkang 120 aqueous solution 200-fold, or 50% captafol 500 to 800-fold for control. Or 80% anthracnose Fumei 500 to 600-fold, etc.