Lettuce Lactuce indica L. is a herbaceous plant of the Asteraceae family and is used as root medicine. Distributed throughout the country.
Symptoms mainly affect the leaves. At the beginning, white powdery mildew develops on both sides of the leaves, and a layer of light grey white powdery mildew spreads over the foliage. When conditions are right, they are connected to each other, causing the entire leaf surface to be covered with white powdery material. A thin layer of white powder. The disease started from the lower leaves of the seedlings, and the upper leaves spread afterwards. The entire leaf appeared white, causing the leaves to yellow or wither. The Minister of post-stage disease developed a small black spot, namely the closed shell of the pathogen.
Pathogen Sphaerotheca fusca (Fr.) Blum. called brown silk monocystic shell, synonymous with Sphaerotheca fuliginea (Schlecht.) Poll. The single capsule shells are all Ascomycotina spp. Sphaerotheca fusca Ascospora is dilute at petiole, stem, and calyx, brown to dark brown, globose or subglobose, 60-95 μm in diameter, with 3-7 appendages, inserted below fruit of capsule, ca. 0.8-3 times the diameter of the ascomypian fruit, with 0 to 6 diaphragms, containing 1 ascitium; ascaria oval or ovate, few with short handle, size 50 to 9550 to 70 (μm), containing 8 Or 6-8 ascospores; ascospores oval or nearly spherical, size 15-2012.5-15 (μm). In addition Erysiphe cichoracearum DC. can also infect lettuce. Wintering. In spring and May-June, the ascospores are emitted through the wintering of the closed cell shell; the conidiospores produced by the wintering of the mycelium on the damaged plants are transmitted through the air flow, and the initial infection and re-infestation are carried out and fall on the leaves. Conidia in the case of the appropriate conditions, the spores germinate to invade the skin from the invasion of the epidermis, in the epidermis grow sucking cells to absorb nutrients. The mycelium on the leaf surface of the larvae expands continuously on the outer epidermis of the host, producing a large number of conidia for repeated infestation. Conidia can germinate at 10-30 °C, 20-25 °C optimum. The production of 16-24 °C, high relative humidity is easy to disease. Planted dense, poor ventilation or nitrogen fertilizer, the incidence of heavy.
At the beginning of the disease prevention and control method, spraying 10% Shibaoling Suspension 1000 times or 1:1:160 times Bordeaux mixture, 15% Triadimefon Wettable Powder 800-1000 times, and 50% benomyl WP 10,000-1500 times. Liquid, 60% mildew-proof ultra-fine wettable powder or water-soluble powder 600 times, 47% Garnett's wettable powder 800 times, 30% green detergent suspension 400 times, 40% Fuxing's emulsion 9000 times , Every 667m2 spray good liquid 50L, every 10 to 20 days 1 times, control l a 2 times. The drug was stopped 7 days before harvest.
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