Recently, some farmers came to the plant protection station to inquire about the reasons for the yellow and dry leaves of the corn seedlings. After field investigation, we found that these yellowed, dry-leaved corn seedlings had traces of insect bites on stems or roots. Digging out of the seedlings was found to be the damage of the golden needleworm, and one more plant has reached 2 to 3 heads. The corn worm is a kind of larvae that feed on the ground and underground roots of corn in the ground. It can bite off seedlings that have not been excavated. It can also feed into the roots of the larger corn seedlings, resulting in the death of corn seedlings and the lack of seedlings. The ridge phenomenon can seriously destroy the whole field. Therefore, it reminded the majority of peasant friends to actively take action to inspect and cure the golden leafworm in order to reduce its damage.

First, the morphological characteristics of corn beetles is the larvae of the cockroaches, is a polyphagous ground pests, commonly known as iron wireworms, adult commonly known as the cockroach. Is a Coleoptera, and a genus of the genus Chaetocera. There are three main types of damage that are severe: Golden worms, golden-eye worms, and golden-leaf worms. The genus Gossypium erinaceus has a body color of yellow-brown (white at the beginning of hatching), a wide body shape, flattening, and a longitudinal groove on the back of the thorax and abdomen; the body of the thin-breasted phleboworm is pale yellow-brown (naive white translucent) slender, round Cylindrical. The worm body is hard, smooth and glossy. The old larvae are 13 to 20 mm long.

Second, living habits and the characteristics of damage Golden needles about 3 years 1 generation, with adults and larvae in the soil in winter. The overwintering adults were unearthed in March and the peak period of egg laying in May. The eggs began to infest after hatching. The larvae prefer wet soils, and the damage is severe when the soil temperature is 10°C to 7°C to 13°C. After adult emergence, the activity ability is strong, and it has a tendency towards the just decayed grasses. When the damage is done, the seedlings that have just been excavated can be bitten, and they can also feed into the roots of the growing seedlings to ingest food. The victim is not completely snapped and the fractures are not neat. They can also eat seeds, tubers and roots, and make holes, and the affected plants die when they die.

Third, the prevention and control methods As the golden worm is a larvae does not unearth the underground pests, and there is no odor, so the control is only effective when applied to the soil.

1. Chemical seed dressing. Use 40% methylisothiphos, 50% phoxim, 48% chlorpyrifos, or 50% parathion EC as 0.1% to 0.2% of seed weight and 10% to 20% of water, evenly distributed. Spray on the seeds and boring for 4 to 12 hours.

2. Irrigation. Use 40% Dimethoate EC or 48% chlorpyrifos EC 1000 times to irrigate root; or use 50% phoxim or 15% chlorpyrifos EC 1000 times for rooting.

3. Apply poisonous soil. Mu with 2.5% methyl iso-phosphorus granules (ground up to) 2 ~ 3 kg mixed soil 20 ~ 25 kg; or 5% methyl chlorpyrifos granules per mu 2 ~ 3 kg mixed fine soil 25 ~ 30 kg; Or kill 2 kilograms of land worms mixed with 20-25 kilograms of fine soil sprinkled on the soil surface and then watering to improve the control effect. Can also use 50% phoxim EC 200 ~ 250 grams, add water 10 times, spray on 25 ~ 30 kg of fine soil and mix well into poisonous soil, along the ridge application, then shallow.

4. When it is severe, it can be watered to force the pests to move vertically to the deep layer of the soil to reduce the damage.

It should be noted that if corn has been applied with herbicides for the stems and leaves of the main component of nicosulfuron, organophosphorus pesticides are banned 7 days before and after application, otherwise phytotoxicity will occur.

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