The main varieties of melons are cucumber, watermelon, melon, melon, squash (squash), pumpkin, loofah, zucchini, bitter gourd, snake gourd and gourd, among which cucumber, watermelon and melon are the largest. Chemical control of weeds is not only convenient but also efficient. Different pesticides should be selected for different melons. The following are the highlights of pesticides suitable for different melons:
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1, cucumber field. 1 live Daejeon. Cucumbers and other melon crops are sown before emergence (usually on the day after sowing or 2-3 days after sowing), and are treated with the following herbicides; 200 ml of 20% dichlorpyrifos (Daihuili) emulsifiable concentrate per 667 square meters. Or use 200% of 48% dilute emulsifiable concentrate per 667 square meters, or use 33% of weeding (Shi Tianbu) emulsifiable concentrate 80-120 ml per 667 square meters, such as 40-50 liters of water, spray evenly on the above table.
The above three herbicides mainly prevent annual grass weeds, and can also prevent some annual broadleaf weeds. Weeding has a slight phytotoxicity to cucumber, but the damaged cucumber quickly recovers.
3 transplanted the field. The soil treatment agent used for transplanting the field requires that after the melons are transplanted, the seedling height is about 15 cm and sprayed on the soil surface. Or use 100% of the 667 square meters of 48% trifluralin emulsifiable concentrate, or 33% of the 667 square meters of weeding emulsifiable concentrate 100-150 ml, or 33% of the 667 square meters of weeding emulsifiable concentrate 100-150 ml, or every 667 200 square meters of 20% dichlorfen emulsifiable concentrate, 40-50 liters of water, applied to the surface after watering in the evening in the hot season.
According to the test, the effects of herbicide weeding, trifluralin on the prevention of goosegrass and crabgrass are 72%-100%, and the effects of controlling cockroaches and cockroaches are 42%-92.6%. In addition, the simple control of grass weeds should use 12.5% ​​grass emulsifiable concentrate, 30-50 ml per 667 square meters, or use stem and leaf treatment agents such as stable kill, grass, grass and grass, in grass weeds Sprayed on the stems and leaves at 4-6 leaves, it is absolutely safe for melons.
2, watermelon, melon field. According to the law of weed occurrence, there are three application schedules for chemical weeding in watermelon and melon fields: one is to apply soil mixture before planting or before transplanting. The herbicides available are mainly trifluralin, herbicide, diltiazem, Dahuili, dichlorfen and herbicide. The second is to apply soil for seed treatment before sowing. Commonly used herbicides include Duer, Fucaojing, Bean Kewei, Herbicidal, Herbicide, Diltiazem, Butachlor, Fluoride, Herbicidal, and Gram. The second is to apply the medicine in the 2-5 leaf stage of the grass weeds before the second water in the melon seedlings. Applicable herbicide varieties include Harvest, high-efficiency grass, Jinghecao, Naicuo, Hecaoling, and glyphosate.
148% trifluralin. The medicine can effectively prevent a variety of annual grass weeds such as crabgrass, goosegrass, medlar, foxtail, and ginseng, and has certain control effects on broad-leaved weeds of small seeds such as medlar, medlar and medlar, and sedge and A variety of broadleaf weeds are ineffective. Before transplanting the melon seedlings, the soil was mixed with 57 cm deep, and the melon seedlings were transplanted after 3 days. The content of soil organic matter is low or the amount of sand loam is low, the soil organic matter content is high or the amount of clay loam can be higher. The use of trifluralin in live field is easy to cause phytotoxicity to melon seedlings and should be avoided.
250% big profit. This medicine has good annual and double cotyled weeds such as alfalfa, crabgrass, goosegrass, wild oats, maiden, foxtail, purslane, amaranth, hedgehog, alfalfa, sorghum, and longan. Control results. Before sowing, use 50% Dahuili WP 200-300g per 667 square meters, add 30 liters of water, spray evenly on the surface, and immediately smash the ground, mix the medicinal agent into the soil layer of 57 cm deep, and then sow.
310.8% efficient grass cover. This medicine can effectively prevent annual grass weeds. The drug is absorbed and transmitted by weeds quickly, and the application period is long. It is safe for melons. It can be applied in the period from weed emergence to growth, and the best application effect is in the 3-5 leaf stage of grass weeds. For every 667 square meters, use 10.8% of high-efficiency grass cover to 25-30 ml, add 30 liters of water, and spray evenly.
Other significant measures.
According to the China Pesticide Network , the control of weeds in melon vegetable fields is particularly important in addition to the selection of seeds that do not contain weeds, the selection of strong seedlings, and the rational application of decomposed organic fertilizers. Before the transplanting of melons, the fields must be ploughed or sown or applied with herbicides such as glyphosate. It is necessary to eliminate the weeds before transplanting, so that in the competition between melons and grasses, melons can be Dominance. 
Scientific use of chemical pesticides in melon vegetable weeds