How to prevent and control strawberry snake-eye leaf spot? Detailed introduction to prevention and control methods
It mainly damages the leaves, and also damages the petioles and fruit stalks, making it a common disease of strawberries. 1. Symptoms. In the early stage of the disease, small dark purple spots form, which then expand into nearly round or oval lesions. The edges of the lesions are purplish red, and the centers are grayish white or grayish brown, with slight concentric rings, making the entire lesion resemble a snake eye. On the...
It mainly damages the leaves, and also damages the petioles and fruit stalks, making it a common disease of strawberries.
1. Symptoms. In the early stage of the disease, small dark purple spots form, which then expand into nearly round or oval lesions. The edges of the lesions are purplish red, and the centers are grayish white or grayish brown, with slight concentric rings, making the entire lesion resemble a snake eye. No small black grains form on the lesions.
2. Transmission method and conditions for disease development. The pathogen overwinters in the form of diseased residues, and the following year conidia are spread by airflow. In open-field cultivation, the disease is severe at harvest time, and it is also severe in seedling beds during seedling raising. If too much water is applied or heavy rain occurs, plants are prone to the disease.
3. Prevention and control methods. Remove diseased and old leaves early and destroy them, and avoid continuous cropping; in the early stage of the disease, use 75% chlorothalonil wettable powder at 500-700 times dilution, or 70% zineb wettable powder at 200 grams per mu mixed with 75 kilograms of water, spraying once every 10 days.