Control method of underground pests damaging seeds and biting young roots and tender stems of vegetables

Underground pests are one of the great enemies of vegetables in greenhouse, harming seeds, buds and rhizomes, resulting in lack of seedlings, or even seed destruction, resulting in reduced vegetable production.

Damage of underground pests in vegetables

1. Main harmful symptoms:

The main results are as follows: 1. Grub is a beetle larva, which feeds on young roots, white stems and underground parts of vegetables, and often bites or breaks off. the harmful characteristics are as follows: the fracture surface is neat, which makes the seedlings wither and die.

2. Golden needle worm is a kowtow larva, which bites seeds, germs and rhizomes. The harmful characteristics are as follows: it bites the young rhizome out of small holes, resulting in dead seedlings, lack of seedlings, and tuber rot.

3. Mole cricket bites the newly sown or germinated seeds in the ground, and feeds on tender stems and roots. the harmful characteristics are as follows: the bite becomes hemp-like, moves on the surface of the ground, forms a tunnel, separates the root from the soil, and causes the seedlings to wither and die.

4. The ground tiger larva, with miscellaneous food habits, lurks in the soil during the day and unearthed at night. The harmful characteristics are as follows: biting off the base of the stem, resulting in lack of seedlings and broken strips, or even seed destruction.

Second, prevention and control measures:

1. Agricultural control: do not apply unripe organic fertilizer to prevent adults from spawning, intensive cultivation, timely suppression of soil and removal of weeds in the field. In serious areas, the overwintering larvae can be turned to the surface in autumn and winter to dry, freeze to death and be preyed on by natural enemies, and the mechanical killing effect is obvious.

2. To treat the soil with 200-250 grams of 5% phoxim EC per mu, add 10 times water, spray it on 25-30 kg fine soil, mix well to make poisonous soil, apply it along the ridge or spread it on the seed ditch or ground, then plough or mix it into barnyard manure, 5% phoxim granule, mix poisonous soil, 2.5-3 kg per mu.

3. Seed dressing with chemicals. Mix the seeds with 50% phoxim, water and seeds according to 1-30-400-500, or coat the seeds with organophosphorus agents or 2% seed weight coating agent.

4. Poison bait. With 150-200 grams of 25% phoxim capsules per mu, mixed with 5 kilograms of millet and other bait, scattered in the seed ditch, the control effect is also good.

5. Physical methods. In conditional areas, black lights can be set up to trap and kill adults and reduce the number of pests.

6. Biological control. If possible, biological agents such as Beauveria bassiana can also be used to control underground pests in vegetables.