Control methods of main diseases of Hami melon

* * the main diseases of Hami melon are Phytophthora, downy mildew and powdery mildew. Bacterial leaf spot, vine blight, virus disease and liedang. The main control measures and pesticides are as follows: first, Phytophthora (dead seedlings, wilt, rotten melon) (1) selection of disease-resistant varieties (2) use 15-20cm (0.4-05cm), 0.08-0.1cm sowing or root transplanting from the border. (3) it is forbidden to flood irrigation, continuous irrigation, series irrigation and stagnant water, and the water level from June to July is 1-2-2-3 on the border wall. (4) before or at the beginning of the disease, the roots were irrigated with ethyl phosphorus, manganese zinc, dimethoprim, thiram, chloramphenicol and metalaxyl 500 times, with a dosage of 0.3rel 0.5kg / plant, once every 10 days, and 2ml for 3 times. Second, downy mildew (macula, leaf withered, dry) (1) select disease-resistant variety (2) ventilation and light transmission of melon seedlings, control watering, reduce field humidity and dew. (3) 70% ethyl phosphorus manganese zinc, 72% gram mildew, 70% Baiyutong 400 times or Kekangling, and Kelu 600rel 800 times liquid spray were used in time when initial lesions were found. 3. Bacterial leaf spot (white spot, horn spot, rotten melon) (1) the seeds were soaked in 55 ℃ warm water for 20 minutes or 200 times formalin (formaldehyde) solution, and then washed 3 times with clean water for 2 hours. (2) remove early diseased plants or diseased leaves. (3) before the onset of the disease, use 50%DT500 double liquid or 60% Baishuitong (DTM) 600x solution, or 70% Dexong 500x solution, or agricultural streptomycin, neophytomycin 250ppm spray. 4. Powdery mildew (1) select resistant varieties (2) use 15% or 20% trimethoprim 500 Mel 1000 times spray, or 40% polysulfide suspension 1000 times, or sulfur powder or crystal stone sulfur mixture to control. Virus diseases (lobule, mosaic, deformed melon) (1) long-distance vegetable field, avoid continuous cropping, using plastic film, plastic shed, early-maturing cultivation, strengthen the management of water and fertilizer at seedling stage, and promote the growth and development of Hami melon in the early stage. (2) timely removal of early diseased plants. (3) when it is found that the aphid migrates, spray 20% carbendazim 3000 times or 2.5% enemy kill 2500 times, then coat the stem base with 1:5 dimethoate or acephate to kill the aphid. 6. Liedang (1) implement crop rotation and root out flower stems before flowering to avoid seed-bearing and spreading. (2) cut off the flower stem on the ground, drop 16 grains of oil or urea on the stubble, or pour saturated salt water. (3) smear Liedang plants with Duer and monoglyphosphos aqueous agent (1:3:4). The main prevention and control measures of cantaloupe are as follows: first, the occurrence time of mole cricket, golden needle worm and ground tiger is from mid-April to early May. The control method is as follows: before sowing, before covering the plastic film, dig a small hole between the two sowing holes and sprinkle poison bait. Poison bait formula: 100 kg of fried wheat bran, add 0.5 kg of dipterygium, mix well with appropriate amount of water. Second, the occurrence time of species fly, golden needle beetle, jumping beetle and thrips is May, and the control method is to spray 1000 times of trichlorfon or dichlorvos around the seedlings and rhizomes. 3. The occurrence time of aphids is in the middle of June. the control methods are as follows: dimethoate or acephate EC, add 5 parts of water, and apply the medicine to the left and right side of melon seedling minister 10cm with a brush or a small row pen. The occurrence time of the four red spiders is from July to August, and the control methods are as follows: spraying dimethoate EC 800Mel 1000 times, 73% Kmante EC 1000 times, lime sulfonic acid Zipol 0.2 ml 0.3, the above agents can be used alternately, and the application should be stopped 15 days before harvest; 20% trichloropropanol 800ml 1000 times.