Greenhouse cucumber gray mold, disease prevention and cure

Incidence characteristics: a low temperature and high humidity type disease. The main hazards are young melons, leaves and stems, and the disease ministers are long-haired. Most of the bacteria invade from the defeated female flower, causing petal to rot, and grow a light gray brown mold layer, and then spread to young larvae, causing the umbilicus to be water-stained. The young flower quickly becomes soft, atrophic, rot, and the surface is dense. Floor. When the larger melon is killed, the tissue turns yellow and the moldy layer turns pale gray after the emergence of the mold. The affected part of the damaged melon stops growing, decays, or falls off. Blades generally cause disease due to shedding of burnt-out or diseased tendrils, forming large lesions with a diameter of 20-50 mm, nearly circular or irregular shapes, obvious edges, and a small amount of gray mold on the surface. When rotten or rotten flowers are attached to the stem, it can also cause rot in the stem. In severe cases, the lower knots rot and cause the vine to break and the plants die.

Control methods: (1) Control the temperature of the greenhouse, increase the temperature to 25-30°C as much as possible, and do not water it on cloudy days. Advocate the use of small water under the membrane to feed water, and dig wet on sunny days. After the occurrence of gray mold, the diseased melons were promptly removed, brought out in deep burial, and the debris was burned after pulling. (2) In the middle and later stages of cucumber growth, foliar spraying of 0.1% urea plus 0.3% potassium dihydrogen phosphate solution or foliar application of spray-applied water, adding 10 liters of water per milliliter, can increase plant resistance to disease. (3) commonly used agents are 72% Kelu or 58% metalaxyl WP WP 600 times, in the initial period of seedling and flowering results of a spraying prevention, the initial incidence of continuous spraying 2-3 times.

Second, the disease

Incidence characteristics: commonly known as dead vines, is a serious hazard and difficult to control the disease. During the seedling stage, wet rot and contracture occurs at the base of the stem, often resulting in the death of cucumber seedlings. The adult part of the adult stage can be victimized. At the beginning of the stem, it became oily and later softened and contracted, resulting in wilting and even death of the stem above the diseased part. The incidence of fruit is more than that near the ground. The diseased part is initially in the form of oily depression, rapidly rots afterwards, and grows white hair. When mixed with saprophytic bacteria, it has rancid odor. The incidence of leaf lesions was dark green, oily, with large lesions, irregular shapes, and indistinct edges. When wet, the lesion quickly expands, causing the entire leaf to rot. Expansion to the petiole and stem causes the disease. When the air is dry, the lesions are white or light brown and dry and fragile. The disease can be affected several times at the same time. However, the stem's vascular bundle does not change color, which can be distinguished from blight. The Guatemala disease department is oily and obvious depression, which can be distinguished from soft rot and Sclerotinia.

Control methods: (1) timely removal of diseased melon, deep-buried treatment. (2) Perform top dressings several times. If 0.2% urea solution or 0.2% potassium dihydrogen phosphate solution is sprayed once every 5-7 days, spray 3-4 times. (3) Chemical control. Can be used 25% metalaxyl WP 800 times or 72.2% Glucosamine 1000 times or 72.2% Prec 800 times or 64% antiviral 500 times, any one to control. The prevention and control methods were mainly rooted at the same time, and the plants were sprayed at the same time. The amount of liquid per plant for rooting should be over 250 ml, and the spray can be combined with top dressing. It is necessary to alternate 1 to 5 days for drug treatment and control 3-4 times in a row to effectively control the disease.

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