Occurrence and Control of Melon Powdery Mildew in Greenhouse

symptom

Powdery mildew, commonly known as white hair, is a common disease in greenhouse melons. It can occur from the seedling stage to the harvesting stage, but it often occurs in the middle and late stages of plant growth. In this period, the incidence of diseased leaves is heavy and the petioles and stems are secondary. At the early stage of disease, small white patches appear on the leaves, leaves, and young stems, and many leaves appear on the front. Later, they expand into irregular white patches. At the late stage of disease, the white powder layer turns gray and white powder appears scattered or heaps of yellow-brown small particles, and then turns black. The diseased leaves are curled yellow and the leaves and stems partially or completely die, and the melons cannot mature normally. .

Incidence conditions

Powdery mildew can occur at a temperature of 10 to 30°C, and the disease is severe when the humidity is high and the temperature is between 16 and 24°C. Extensive cultivation and management, inadequate fertilization, or partial application of nitrogen fertilizer, watering too much, leading to plant length, excessive foliage, lack of light, poor ventilation, etc., are conducive to the occurrence of powdery mildew.

Control methods

First, agricultural control:

1. After harvesting, remove debris from field disease and reduce the source of infection.

2. Cultivate strong seedlings to improve plant disease resistance.

3. Apply sufficient manure, increase phosphorus and potassium fertilizers, prevent plant growth and premature aging.

4. Pruning in time to ensure good ventilation and light transmission.

5. Reasonable watering, timely exposure to shed ventilation and humidity.

Second, biological control: Spray 2% of agricultural anti-120 or 2% Wu-Yin (BO-10) 200 times liquid agent, every 6 to 7 days and then spray once.

Third, the physical control: the use of 27% high-fat film emulsion 80 to 100 times the liquid, sprayed on the leaves in the early stages of the disease, so that a layer of film formed on the leaves, not only to prevent the invasion of bacteria, but also the formation of anoxic conditions, so that Powdery mildew died. Spray every 5 to 6 days, spray 2 or 3 times.

Fourth, chemical control:

1. Smoked shed. A few days before planting, the greenhouse was closed, and 250 grams of sulphur powder and 500 grams of sawdust were used per 100 cubic meters. The mixture was evenly mixed and put into 4 to 5 small plastic bags. The spots were placed in the evening, and the greenhouse was lit for 1 night after ignition. Can also be selected before the onset of 45% chlorothalonil smoke agent, per 667 square meters (1 acre) 200 to 250 grams of medication, early in the evening distribution, dark fire lit, closed greenhouse smoked 1 night, open the next day Exhale.

2. Spraying: In the early stages of disease development, spray 40% ethoxypyr wettable powder 1200 times, or 40% Fuxing 8000 times, or 25% amisidae suspension 1500 times, or 15% triadimefon. Wettable powder 1000 times, spray once every 7 days, even spray 2 or 3 times.

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