1. Underground pests (1) The melon seedlings often cluster and injure young shoots below the surface of the guajava seedlings, so that the germinated seeds cannot be properly excavated or penetrated from the roots of the seedlings and damage along the young stems, making the hypocotyl hollow, It rots, withered and died above the ground, causing serious seedling failure. Control methods: When live in Daejeon, 40% diazinon powder can be used for seed dressing. The dosage is 0.3% to 0.5% of the seed amount, or 40% dimethoate EC 1000 times soaking. When planting or planting, use 90% trichlorfon crystal 1000 times solution or 80% dichlorvos, 50% phoxim EC 1000 times solution or diazinon 50g channel per acre to apply or spray seedbed. After planting, use 50% of Marathon EC 2000 times as rooting water to prevent melon seed flies from harming. (2) Scorpion larvae damage germinating seeds, bite off the roots and stems of the seedlings, resulting in lack of seedlings and ridges, and the snapped root and stem fractures are neat and tidy. Adults like to eat leaves, young leaves, buds. Control methods: Use 40% Dimethoate EC 800 times, 25% Potassium quinoline EC 1000 times, 80% Trichlorfon Soluble 1000 times, 30% Trichlorfon EC 500 times or 50% Sim Sulphur EC 1500 times liquid spray to prevent adult worm or larvae. (3) The nymphs and nymphs eat freshly-emerged seeds and young shoots, also eat young roots and tender stems, or bite off the roots and stems of the seedlings, resulting in a mess, resulting in poor seedling development and even withering. Control methods: Use 30% dichlorvos EC 800 times to fill the hole. 2. Sucking pests? (1) Gualou? After the young leaves and growth points of the melon seedling are killed, the leaves are curled. When the damage is serious, the entire leaf is curled and the melon seedlings grow stagnant until the whole plant dies. Control methods: Use 40% Dimethoate EC 1000-2000 times, or 50% dichlorvos 1200-1500 times or 2.5% rattan refined EC 600-800 times, or tobacco water, or 2.5% bromide Bacterial ester, or 3000 times of 20% killing mini-emulsion, or 6000 times liquid of killing or 6000 times of 40% fenvalerate, or 20% of 20% chlorimuron EC, or 2.5% of kangfu 4000 Doubling, or 2.5% spray of Uranus EC 3000x. Should be used alternately to reduce the occurrence of insect resistance. (2) Melon leaf nymphs Leafhopper nymphs and adults absorb sap from the back of leaves to form yellowish fine spots. Afterwards, the small dots increase, causing the entire leaf to lose its green and white leaves. The leaves are covered with wire mesh and are dusty. The whole leaves are dry and fall off, plant growth is stagnant, the result period is shortened, and the yield is reduced. ? Control methods: chemical control. Strengthen field inspections and conduct picking when spotting occurs. It can be used with 0.2 degree lime sulfur, colloidal sulfur 200 times, 73% Ketel EC 1500-2000 times, 40% Dimethoate 1000 times, 20% Dioxin EC 1000 times, 20% Astragal Emulsion 1000 Diluent, 5% Nisocao EC 2000 times 2.5% Uranus EC 3000 times, 2.5% synergistic quinolone EC 800 times, 1.8% Eliminating EC 2000 times, 20% Siever EC 2000 times , 5% stuck card 1500 times solution, 20% Liuyangmycin EC 1000 times. (3) Greenhouse whitefly? Adults and nymphs take plant sap, and the victim leaves chlorosis, yellowing, wilting, and even the whole plant withered. ? Control methods: chemical control. 10% buprofezin 1000 times solution has special effects on whiteflies; 25% fleas and intensive chive oil 1000 times solution are effective for whitefly adults, eggs and nymphs; 2.5% Uranus EC 3000 times can kill adults, nymphs, and false fleas; 21% killing and killing 4000 times liquid, 2.5% kungfu cream 5000 times liquid, 20% killing sweeping cream 2000 times liquid, continuous application, all have better results.
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