Main Hazard Characteristics and Control Measures of Vegetable Underground Pests

Underground pests are one of the major enemies of greenhouse vegetables, which harm seeds, young shoots and rhizomes, causing lack of seedlings and even destroying seeds, resulting in reduced yield of vegetables. The method of controlling underground pests of vegetables is introduced as follows:

Main hazard symptoms:

1. The cockroach is a larva of the chafer. It feeds on the young roots, white stems and underground parts of the vegetables. It is often bitten or bitten. The hazard features: the fractures are neat, and the seedlings wither and die.

2. Golden worms are larvae of beetle, biting seeds, germs and rhizomes. Hazard characteristics: The young roots are bitten out of small holes, resulting in dead seedlings and lack of seedlings, causing tuber rot.

3, squatting in the ground to eat just sprouted or germinated seeds, and feeding on the tender stems, roots, hazard characteristics: bite into chaotic, active in the surface layer, forming a tunnel, so that the roots and soil separated, causing the seedlings withered and died.

4, the ground tiger larvae, food miscellaneous, lurking in the soil during the day, the danger of excavation at night, the hazard characteristics: the base of the stem bite, causing crops missing and broken, and even destroy.

Prevention:

1. Agricultural control: no application of unfertilized organic fertilizer to prevent adult worms from spawning, intensive cultivation, timely suppression of soil, and removal of weeds in the field. In severe areas, the wintering larvae can be turned over to the surface to make them dry, frozen, and preyed by natural enemies. The mechanical killing effect is obvious.

2, the agent treatment soil, 200-250 grams per acre with 5% phoxim emulsifiable concentrate, add water 10 times, sprayed onto 25-30 kilograms of fine soil, mix well to make toxic soil, apply ridges or sprinkle in the seed ditch Or the ground, then ploughed or mixed into the manure, 5% phoxim granules, mixed with toxic soil, 2.5-3 kg per acre.

3, pesticide dressing. It is also possible to dress with 50% phoxim and water and seeds at 1:30:400-500, with organophosphorus or with 2% seed coating.

4, poison bait trap. 150-200 g of 25% phoxim capsules per acre, mixed with 5 kg of cereal and other bait, sprinkled in the seed ditch, the control effect is also good.

5. Physical methods. In conditional areas, black light can be set to trap adult insects and reduce the number of pests.

6, biological control. If conditions permit, biological insecticides such as Beauveria bassiana can also be used for the control of underground pests in vegetables.