Cucumber diseases were mainly bacterial leaf spot disease, black spot disease, anthracnose, and cucumber bacterial spot; tomato was mainly caused by leaf mildew, gray mold, virus disease, early blight, late blight, etc.; bean bean had a bacterial disease. Mainly gray mold. In addition, bacterial diseases and gray molds of kidney beans in various greenhouses have also occurred one after another. At the same time, due to the influence of low temperatures in late April, frost damage and physiological diseases have also occurred in various degrees. Pests Temperatures began to rise in recent days, alternating between sunny and rainy days, large temperature difference between day and night, will be conducive to the occurrence of vegetable diseases in greenhouses. It is expected that the common occurrence period of vegetables and insect pests in our province will be from mid-May to late-late, with cucumber downy mildew, cucumber virus disease in the late stage. Diseases mainly caused by tomato early and late blight, tomato virus disease, etc., and insect pests mainly caused by Liriomyza spp. will further cause harm. In this regard, all localities must conscientiously do field investigations to prevent and control vegetable pests and diseases in greenhouses in a timely manner. Prevention advice Do a Good Job of Ecological Prevention and Control to Reduce Pests and Diseases According to the weather conditions, scientifically control the temperature of the greenhouses. On sunny days, avoid overheating of the greenhouses, especially when the temperature of the greenhouses is too high, and avoid sudden fluctuations in room temperature. If the temperature rises significantly, prevent the seedlings from burning and plant growth. Create suitable environmental conditions. Taking cucumber as an example, we must do a good job in cooling, dehumidification and ventilation. Take sunny morning watering, close doors and windows after watering to increase temperature, and then ventilate and other measures, so that the greenhouse temperature is maintained at 25 ~ 28 °C during the day, about 15 °C at night, relative humidity is about 60% during the day, at night below 95% The soil moisture content is below 70%. This measure has a good control over a variety of hi moist diseases. Promptly carry out chemical control Botrytis cinerea: can be controlled by 1% Wuyimycin agent 150 times liquid spray of biological agent, or 65% Benmodulin wettable powder 1000 times solution, or 40% application of leprosy 800 to 1000 times liquid spray. Scab: The biological agent can be controlled by 1% Wuyimycin agent 150 times solution or 40% Fuxing agent 8000 to 10000 times solution. Keratoderma: 1 million units of neophytin 4000 to 5000 times; 30% of copper chloride WP wettablet 500 times; 77% of WP can be killed 400 to 500 times. Viral disease: 2% of the bacteria grams of grams of water agent 200 to 260 times the liquid leaflet enemy 500 to 800 times; 20% of the virus A WP 400 to 500 times the liquid plus lobular enemy 500 to 800 times. Downy mildew: 25% Ami-Silda suspension agent 25 grams per mu; 72.2% Precive water agent 700 to 800 times liquid; 72% Kelu wettable powder 500 to 600 times liquid. Early blight: 25% Amizyme suspension agent 25 grams per acre; or 50% acetaminophen wettable powder 1000 times, or 50% Garnett WP 400 times spray control. Physiological diseases should strengthen the management of temperature, moisture, and fertilizers to improve the plant's resistance to stress and alleviate the disease. Liriomyza sativae: can be used biological preparations 1.8% Indimethoate emulsifiable concentrate 3000 ~ 4000 times liquid, 50% latent g wettable powder 5000 times spray; 24.5% multifaceted hand 1500 ~ 2000 times liquid.
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