Cold Shed Cucumber is a type of vegetable grown in spring fruits and vegetables. At the turn of spring and summer, the temperature is high and low, and the rapid changes in external environmental conditions often have adverse effects on the normal growth of cold-shelter cucumbers. If management is not in place, it often leads to the occurrence and spread of a variety of diseases, causing great problems for vegetable farmers. loss. Below, introduce common cold cucumber diseases and control methods in spring, for reference by farmers.
First, downy mildew
When the temperature reaches 15-28°C and the relative humidity is greater than 80%, the disease is easy to occur; the temperature of the greenhouse is low, the watering is too much, the plants grow vigorously, and the field canopy closure and even rainy weather cause the occurrence and prevalence of the disease. . At the beginning of the disease, 25% of treprolasin can be used for 800 times, or 64% for 400 times, or 72.2% for 800 times, 7-10 days, and 3-6 times. Such as downy mildew outbreak, difficult to control, you can consider high temperature stuffy shed method (provided that the cucumber plants must be robust), choose sunny watering in the morning, increase indoor humidity, in order to improve the plant's high temperature capability, close the greenhouse to room temperature Raise to about 45°C, hold for 1.5-2 hours (starting at 43°C), then cool down. After the shed, the plants and young larvae are affected by high temperature, and the growth will be subject to certain restrictions. In order to restore the growth momentum as soon as possible, the quick-acting fertilizer may be applied, or the leaves may be topped with sugar and nitrogen to supplement the nutrition.
Second, wilt
When the temperature is between 24-30 °C, the disease develops rapidly, and soil viscosity, poor drainage, excessive watering, more underground pests, and more wounds at the root can easily lead to disease. The diseased plants in the field should be promptly treated with pesticides. The relatively severe diseased plants should be immediately removed and applied in the diseased planting holes to prevent the spread of pathogenic bacteria caused by flowing water and cultivating. In the early stage of disease, 50% carbendazim 500 times solution or 50% thiophanate-methyl 400 times solution can be used to irrigate the roots. 250 grams of drug solution per plant, 10 days irrigation, and 2 to 3 irrigations. At the same time, do not injure the roots and vine vines during cultivating, pruning, spraying, and melon harvesting to prevent the bacteria from infecting the plants through the wound.
Third, powdery mildew
The fields are closed and the plants are susceptible to disease. In the early stage of disease, agricultural antibiotics can be used for 120, or 40% DuPont Fuxing 2000 times liquid spray, spray 7-10 days, and spray 3-4 times.
Four, bacterial angular spot
The humidity in the field is high, rainfall is high, and the disease is easy to develop under poor ventilation conditions. DT fungicide can be used at the beginning of the disease 500 times, or 47% Garnett 600-800 times spray, spray 5-7 days, and even spray 3-4 times.
V. Diseases
When it encounters the conditions of high temperature, rain, and humidity in the field, it is easy to develop. Available early in onset
25% of treprolasin 800 times, or 72.2% of Prec 400-600 times spray, spray 5-7 days, and even spray 3-4 times.
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