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(1) Melon flies are often clustered as young stems below the topsoil of the melon seedlings, so that the germinated seeds can not be unearthed normally, or drilled from the roots of the seedlings, causing damage to the young stems, making the hypocotyls hollow, rotten, aboveground Withered death, causing severe lack of seedlings.
Control method: When the field is broadcast live, 40% diazinon powder can be used for seed dressing, the dosage is 0.3%~0.5% of the seed amount, or soaked with 40% dimethoate 1000 times liquid. When sowing or planting, apply or spray the seedbed with 90% trichlorfon crystal 1000 times solution or 80% dichlorvos, 50% phoxim emulsifiable concentrate 1000 times solution or 50 g of diazinon per acre. After planting, use 50% marathon emulsifiable concentrate 2000 times as root water to prevent melon flies from harming. 
(2) The seedlings of the larvae are germinated, biting off the roots and stems of the seedlings, causing the lack of seedlings and ridges, and the fractures of the roots are bitten and tidy. Adults like to eat leaves, young leaves, flower buds. 
Control method: use 40% dimethoate 800 times solution, 25% synergistic quetiapine emulsifiable concentrate 1000 times solution, 80% trichlorfon soluble powder 1000 times solution, 30% trichlorfon emulsifiable concentrate 500 times solution or 50% octyl sulfide Phosphoric emulsifiable concentrate 1500 times spray to control adult or irrigated larvae.
(3) è¼è›„
Adults and nymphs bite freshly germinated seeds and shoots, and also eat young roots and tender stems, or bite the roots of the seedlings, causing numbness, resulting in poor seedling development and even withering.
Control method: use a 30% dichlorvos EC 800 times solution to fill the hole. 
2. Sucking pests
(1) melon
After the leaves and growth points of the melon seedlings were damaged, the leaves were curled up. When the damage was serious, the whole leaves were curled, and the growth of the seedlings was stagnant until the whole plant died. 
Control method: use 1000% dimethoate emulsifiable oil 1000 times to 2000 times liquid, or 50% dichlorvos 1200 times to 1500 times liquid or 2.5% fish vine concentrate oil 600 times to 800 times liquid, or tobacco water, or 2.5% cyanogen bacteria Ester, or 20% fast killing butyl emulsion 3000 times solution, or kill 毙 6000 times solution or 40% fenvalerate 6000 times solution, or 20% chlorpyrifos 2000 times solution, or 2.5% Kungfu emulsifiable concentrate 4000 times Liquid, or 2.5% Uranus EC 3000 times liquid spray. Should be used alternately to reduce the occurrence of insect resistance.
(2) Melon leaf
The nymphs and adult larvae suck the juice on the back of the leaves, forming a yellowish fine spot. After that, the small spots increase, so that the whole leaves are chlorotic and white, the leaves are covered with wire mesh, and the dust is stuck. In severe cases, the whole leaves are dry and shed, and the plants grow. Stagnation, the result period is shortened, and the output is reduced. 
Control method: chemical control. Strengthen the field inspection and pick it up when the film is taken. 0.2 degree stone sulfur mixture, colloidal sulfur 200 times solution, 73% gram emulsion 1500-2000 times liquid, 40% dimethoate 1000 times solution, 20% gram emulsion 1000 times solution, 20% double nail emulsifiable concentrate 1000 Double solution, 5% Nisolron EC 2000 times solution 2.5% Uranus EC 3000 times solution, 2.5% synergistic quetiapine emulsion 800 times solution, 1.8% extreme elimination cream 2000 times solution, 20% elimination sweeping cream 2000 times solution 5% card gram emulsion 1500 times solution, 20% Liuyangmycin emulsifiable oil 1000 times solution. 
(3) Greenhouse whitefly
Adults and nymphs suck on plant sap, and the leaves are chlorotic, yellow, wilting, and even the whole plant is dead. 
Control method: chemical control. 10% phlegm 1000 times liquid has special effects on whitefly; 25% cockroach emulsifiable milk 1000 times liquid is effective for adult mites, eggs and nymphs; 2.5% Uranus emulsifiable concentrate 3000 times can kill adult nymphs, nymphs, false mites; 21% killed 毙 4000 times liquid, 2.5% Kung Fu emulsifiable oil 5000 times liquid, 20% killed emulsified milk 2000 times liquid, continuous application, have good results.
Main pest control methods that harm watermelon
Underground pest
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