Cucumber blight is a common and serious disease in cucumber cultivation. Once it occurs, it will greatly reduce the quality and yield of cucumber. Let's learn about the control techniques of cucumber blight. First, the symptoms Mainly harmful to stems and vines, but also damage to leaves and fruits. Stem When the stems are afflicted, there are oily lesions near the nodes, oval or diamond-shaped, grayish white, slightly concave, and sometimes overflowing with amber resin-like gel. When dry, the diseased part of the disease is shrunk and longitudinally cracked, and a large number of small black spots are scattered on the surface. When wet, the lesion spreads faster, and the first half of the stem makes the upper part of the plant wilting and die, and the diseased part rots. 2. Blade When the leaves are damaged, they produce nearly round or irregular large lesions. Some lesions develop inward from the leaf margins in a "V" shape or semi-circular shape, light brown, and the lesions are easily broken, often cracked and dry. It is yellowish brown to reddish brown, with small black spots on the lesions. 3. Fruit The fruit is mostly infected in the flowering stage of the young melon, and the flesh is light brown and softened, showing heart rot. The blight of the stem spreads from the epidermis of the stem to the inside, but the vascular bundle does not change color. This is different from the wilt disease, and the disease only causes local rot. Second, the law of incidence Climatic factor The average temperature is 18 to 25 ° C, and the relative humidity is higher than 85%. The field is hot and rainy. 2. Cultivation factors The protective ground is suitable for temperature and high humidity, and poor ventilation is conducive to the onset. Continuous cropping, flat cultivation, poor drainage, excessive density, insufficient light, weak plant growth, and serious onset. The pathogens are conidia or sub-capsules with the diseased body in the soil, or attached to seeds, rods, scaffolding for wintering. It spreads through stomata and water holes or wounds through wind and rain and irrigation water. Third, comprehensive prevention Agricultural control Formulated fertilization technology is applied to fully decomposed organic fertilizer. Thoroughly remove the sick body from burning or deep burial after harvest. Protected cultivation should focus on reducing humidity, carry out ridge cultivation, cover the whole membrane, and under-film dark irrigation. Under conditions, drip irrigation can be used; reasonable dense planting, enhanced ventilation and light transmission, reducing indoor humidity and dripping, timely removal during cucumber growth Diseased leaves; open field cultivation to avoid flooding of large water, strengthen flood control during the rainy season, reduce soil water content, and properly control watering after onset. 2. Chemical control In the early stage of the disease, you can use 75% chlorothalonil WP 600 times or 70% thiophanate-methyl WP 1000 times, usually spray 3 times after 4 to 4 days, according to the condition. Take medication. Today's content is here, I hope to help you grow up with friends who need it. For the wonderful pictures and popular comments on the prevention and control of cucumber blight, you may be interested in the following recommended contents of Hui Nong. Welcome to read. Reflective Sheeting,3M Reflective Sheeting,Best Reflective Tape,Colored Reflective Tape Kunshan Jieyudeng Intelligent Technology Co., Ltd. , https://www.jerrytapes.com.jpg "Symptoms and Integrated Control of Cucumber Blight")
