First, the harm symptoms
The bitter gourd cultivated in the greenhouse or open field can be affected in the early spring or late fall, mainly affecting fruit and stem vines. Fruit infections began in the streaking department and began to be water-stained. After the growth of white mycelium, the mycelium became entangled into the black rat fecal nucleus. Stems spread at the diseased part of the disease at the beginning of the disease to produce water stains, then grow mycelium, more than the diseased part of the leaves, withered and withered.
Second, control methods
1. The selection of disease-resistant and cold-tolerant varieties can reduce the incidence.
2, soak deep. Conditional implementation of the rotation with aquatic crops or soaking irrigation fields in the summer to soak for half a month, or deep-fall in time after harvest, the depth requirement is up to 20 cm, the sclerotia are buried deep, and the ascidian plate is unearthed. At the same time using formula fertilization technology, enhance parasitic disease resistance.
3, seed and soil disinfection. Before planting, use 20% methyl-tocobustrum as a medicine for soil penetration into the soil. Mix 0.5kg per 667kg of 0.5kg of fine soil and soak seeds in warm water at 50°C for 10 minutes to kill sclerotia.
4, strong management. In the morning, the greenhouse is mainly warmed up in the boring room. In the afternoon, the room is vented in a timely manner. After the onset of illness, the night temperature can be appropriately increased to reduce condensation. The average temperature in early spring is controlled at 29°C or 31°C, and the relative humidity is lower than 65%. Onset, prevent excessive watering, when the soil moisture is high, appropriately extend the watering interval.
5, pharmaceutical control
(1) When a cotyledon disk occurs in a greenhouse or open field, smoke or spray is used for prevention and control. Use 15% quick-king agent or 45% chlorothalonil smoke agent, every 667 to 250 grams, smoke for 1 night, every 8 to 10 days, alternately or alternately with other methods to control 3 to 4 times; Ejection 5 % chlorothalonil dust agent, every 667g 1kg; 50% acetaminophen wettable powder 1500 times liquid plus 70% thiophanate-methyl (methyl thiophanate) WP 1000 times spray at full bloom, every 667 60 liters of good spray liquid, every 8 to 9 days 1 time, continuous control of 3 to 4 times, when the condition is serious, in addition to the normal spray, but also the above fungicide on 50 times, smear in the vine The disease department not only controls the expansion but also has therapeutic effects.
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