Disease caused by Phytophthora in Solanaceae vegetables
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Pathogens and Symptoms (1) Pepper Blight. The pathogen is Phytophthora capsici. Severe onset under high humidity conditions. The whole growth period of the pepper may be affected. The basal part of the stem is dark greenish water-stained soft rot at the beginning of the disease, followed by brown streaks that extend around the epidermis. The seedling stage causes cataplexy. (2) Eggplant Blight. The pathogens are parasitic Phytophthora parasitica and Phytophthora capsici, and the onset is heavy under conditions of high temperature and high humidity. Seedlings and stems at the seedling stage of the seedling stage showed water-stained at the beginning of disease, dark green or purple-brown afterwards, and diseased area contracted. (3) Phytophthora root rot of tomato. Pathogens are parasitic to Phytophthora and Phytophthora capsici. High temperature and high humidity or low ground temperature are easy to cause. At the beginning of the disease, brown spots develop at the base or root of the stem, and the depression gradually enlarges. When the disease is severe, the lesion moves around the base of the stem or the root for a week. Longitudinal view of the base of the stem or the root can be seen dark brown tube, later root rot, not long new roots.
The prevention and control techniques adopted the selection of disease-resistant varieties, soaking in warm soup, culturing and planting, controlling humidity, and other measures. At the beginning of the disease, 50% Metho-Zinc Manganese Zinc Wettable Powder 500 times or 72.2% Promase Wee Hydrochloric Acid Saline 800 times sprayed.