What pesticides are effective for controlling underground pests in watermelon

Watermelon is a common fruit; in the hot summer, eating one or two slices can cool you down and relieve the heat. It is cultivated throughout our country, so what pesticide should be used for underground pests in watermelon?

1. Seed maggot

The seed maggot often gathers to damage the young stems below the topsoil of watermelon seedlings, so that germinated seeds cannot emerge normally, or it bores in from the seedling roots and damages upward along the young stems, causing the hypocotyl to become hollow and rot, the aboveground part to wither and die, and serious gaps in the stand. Control methods: when direct seeding in the field, seed can be dressed with 40% diazinon powder at 0.3%-0.5% of the seed weight, or soaked with 40% dimethoate emulsifiable concentrate at 1000 times dilution. When sowing or transplanting, use 90% trichlorfon crystal at 1000 times dilution, or 80% dichlorvos, 50% phoxim emulsifiable concentrate at 1000 times dilution, or apply 50 grams of diazinon per mu in furrows or spray the seedbed. After transplanting, use 50% malathion emulsifiable concentrate at 2000 times dilution as the root-setting water to prevent damage by the seed maggot.

2. White grubs

White grub larvae damage germinating seeds and bite off the roots and stems of seedlings, causing gaps and broken rows, and the bitten root and stem cuts are flat and neat. Adults like to feed on leaves, tender leaves, and flower buds. Control methods: use 40% dimethoate emulsifiable concentrate at 800 times dilution, 25% synergized quinalphos emulsifiable concentrate at 1000 times dilution, 80% trichlorfon soluble powder at 1000 times dilution, 30% trichlorfon emulsifiable concentrate at 500 times dilution, or 50% phoxim emulsifiable concentrate at 1500 times dilution to spray for adult control or drench the roots to kill larvae.

3. Mole crickets

Adult and nymph mole crickets bite and feed on newly germinated seeds and young sprouts, and also feed on young roots and tender stems, or bite off the root crown of seedlings, leaving it in a tangled hemp-like state, causing poor seedling development and even withering. (1) Seed treatment. Use pesticide seed dressing; the amount of pesticide must be accurate, the dressing must be uniform, and after dressing the seeds must be fully dried, then sprouted and sown. (2) Apply poison bait at sowing. The bait can use roasted fragrant beans, wheat bran, corn grits, and soybean cake as attractants. For every 1 kg of bait, add 10 grams of trichlorfon or 10 grams of 40% phoxim emulsifiable concentrate, add an appropriate amount of water and mix until moist. Generally, it is spread into the watermelon field or seedbed before sowing or transplanting, and the control effect is good. When the infestation is severe, 30% dichlorvos emulsifiable concentrate at 800 times dilution can be used to drench mole cricket burrows.

Underground pests of watermelon can harm watermelon growth; control should mainly focus on prevention, and if damage occurs accidentally during the growth process, control measures should be taken promptly.