plant Control techniques of cucumber diseases
The occurrence of cucumber diseases is common and destructive in severe cases. It is closely related to the occurrence of disease and the condition of its development. The specific diagnosis and control have several aspects: first, the selection of disease-resistant varieties; second, cultivation of disease-free seedlings to improve the level of cultivation and management; third, in the early stage of disease, cucumber is one of the main vegetables that people like to eat. In recent years, the area of sunlight greenhouse in Beipiao City has been expanded to 100000 mu, and the cultivation area of cucumber has been expanded year by year, and the production level has been gradually improved One of the main measures of cucumber disease diagnosis and control is to improve cucumber yield and yield.
1、 Cucumber downy mildew symptoms. In the early stage of the disease, water soaked small yellow spots appeared on the surface of the leaves. After the disease spots expanded, they were limited by the leaf veins, forming a polygonal light yellow brown to the disease spots, and the black gray mold layer was found on the back of the leaves. 2. Control methods 2.1 select disease resistant varieties, strengthen field management, control humidity, and increase the application of phosphorus and potassium fertilizer. 2.2 use 80% aluminum ethylphosphate 400 times solution or 75% chlorothalonil 600 times solution; 45% chlorothalonil aerosol 250 grams per mu. The above pesticides are sprayed once every 7-10 days and used alternately. 2、 Powdery mildew 1. Symptoms. The main damage to the leaves, serious petiole, stem produced white mold, rapid development, gradually the leaves become gray white, resulting in leaf yellow. It is more serious in the plot with insufficient light, poor ventilation and weak growth. 2. Control 2.1 select disease resistant varieties, strengthen ventilation, control temperature and humidity, and remove disease residual plants. 2.2 chemical control. Spray 75% chlorothalonil 500-600 times; Triadimefon 1000 times; agricultural antibiotic "120" 100-500 times; chlorothalonil aerosol, sulfur yellow powder fumigation. 3、 Fusarium wilt 1. Symptoms. The diseased plant leaves wilt and droop, the stem is yellowish brown longitudinal crack, the diseased plant grows white or pink mold, the vascular bundle turns brown, and the whole plant withers. The suitable temperature is 28 ℃, the soil temperature is 25 ℃, and the humidity is high. 2. Control method 2.1 cucumber can only be planted in the disease area for 3-4 years to avoid continuous cropping. 2.2 black seeded pumpkin was used as rootstock for grafting cultivation. 2.3 the mixture of 50% carbendazim or thiophanate methyl with 1.2 kg and 25 kg of fine soil should be mixed evenly. The mixture should be sprinkled in the sowing ditch or planting hole and irrigated with water, or the root should be irrigated with 200 times of 10% shuangxiaoling solution. It can also be used to soak seeds with 500 times carbendazim for 1 hour. 4、 Symptoms. The seedlings were damaged first from the growth point, showing dark green water soaked spots and soft rot. The adult plant was injured, and the stem nodes were soaked in water, and the dark green overflowed and shrunk. The stems and leaves above the diseased part withered and died. The diseased fruit was soft and rotten, and gray white mold grew on the surface. It is easy to occur high temperature and humidity in many epidemic areas. 2. Timely control of disease resistance. 2.2 drug control: spraying 75% chlorothalonil 600 times solution; ruidu manganese zinc 500 times solution; 40% aluminum ethylphosphate 200 times solution; or 25% ruidumycin 600 times solution, spraying once every 6-7 days, the effect is better. 5、 Symptoms: damage to leaves, vines and fruits. The diseased leaf spot is nearly round, reddish brown, with halo ring outside, and the middle part of the diseased spot ruptures when it is dry. When the fruit is damaged, it is dark brown, slightly sunken [www.nczfj. Com], easy to bend and deform. Excessive application of nitrogen, poor drainage, poor ventilation and light transmission seriously affected the land. 2. Control method 2.1 select disease resistant varieties, apply more phosphorus and potassium fertilizer, remove diseased plants, and crop rotation. 2.2 drug control: spray 1:2:100 Bordeaux solution; 65% mancozeb 500-800 times solution; 70% mancozeb 400 times solution; 45% chlorothalonil aerosol fumigation 250 g / mu. The above solutions should be used once every 7-10 days, alternately. 6、 Bacterial keratoderma 1. Symptoms. The damaged cotyledons were water soaked concave round spots, gradually yellowish brown, and the true leaves were water soaked light green spots. The polygonal macula was formed due to the limitation of leaf veins, and bacterial abscess was produced. The diseased part was brittle and easy to perforation. 2. Control method 2.1 soaking seeds with agricultural streptomycin 200 kg / mg for 30 minutes. 2.2 the control of watering, ventilation and moisture removal is helpful to reduce the disease. 2.3 use 70% DTM wettable powder 500-600 times liquid; agricultural streptomycin and new plant mycomycin 150-200 kg / Mg, the above chemicals are sprayed once every 7 days, 3-4 times continuously. 7、 Symptoms: the pathogen invades the decaying female flowers, causing the flowers to rot and grow brown mold layer, and then invade the young melon, causing the top rot, the young melon becomes soft and atrophied, and the infected part of the big melon turns yellow first and then decays and falls off. Most of the damaged leaves and stems are caused by diseased flowers, which cause large-scale blight on the leaf surface and stem, causing the stem and leaf to rot and lead to plant death. 2. Drug control: spray with 600 times 50% promethin, 1000 times 50% sumatrin, 800 times 50% Carbendazim and 1000 times 50% carbendazim for 34 consecutive times.