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Warming sheds zucchini sp
First, the incidence of symptoms and symptoms: The disease is mainly conidial or asthenocystic shell with diseased bodies found in dry soil or on the frame, when appropriate conditions rely on irrigation water, rain, dew spread, from the wound, natural hole Intrusion of the mouth, the seeds can also be borne, causing the disease. When the temperature is between 18°C ​​and 25°C and the relative humidity is above 80%, the disease becomes serious when the water holding capacity is too large. In particular, after the melons began to grow, the lower leaves caused severe wounds, and the disease was more susceptible to disease when there was poor ventilation in the greenhouse. The disease mainly harms stems and leaves, and the fruit can also be affected. Damage to stems, first in the vicinity of the base of the stem to produce water-stained oval spots, followed by upward and downward expansion of the growth of oval-shaped brown lesions, around the stem after a week of plant withered. If the damage occurs at the base of the stem and the petiole, the petiole is often affected. When the humidity is high, the lesions are rotten. When the lesions are dry, the lesions are gray-brown and many small black spots appear on the skin. The cortex is split longitudinally. The victim begins with the leaf margin and forms a round or "V" shaped dark brown lesion in the leaf. Fruit damage, first in the middle of the tender guagua melon strips produce water-like dots, after the development of melons, causing melon meat soft rot, melon skin yellow water stains. Second, the chemical control technology: 1. Irrigation control: In the colonization, root melons sit, root melon harvest 15 days after the rooting of the best effect. 60% DTM 400 times or 75% chlorothalonil 600 times or 70% thiophanate-methyl 800 times can be used for root irrigation, and the efficacy is above 90%. 2. Application: Use 60% DTM 50 times or 75% chlorothalonil 50 times or 70% thiophanate 50 times, the effect is more than 95%. 3. Spraying control: spraying with 60% DTM 500 times or 75% chlorothalonil 600 times or 70% thiophanate-methyl 800 times, the effect is more than 80%.