Occurrence characteristics and control of garlic maggot

First, harmful symptoms garlic maggots eat garlic bulbs with larvae, so that the bulbs rot, the aboveground leaves wither, wilt, and even die. The maggot pupa can be found when the injured plant is pulled out, the damaged garlic skin is yellowish brown rotten, the garlic head is drilled into a hole by the larvae, incomplete, and the garlic cloves are exposed and cracked, accompanied by a foul smell. The injured plant is easy to be pulled out and cut off.

Second, the occurrence characteristics of garlic maggots can cause harm before winter. after entering winter, they pupate and overwinter, and begin to Eclosion from pupae to adults in March of the following year. The adults lay their eggs under the soil cracks or clods around the garlic root or even in the leaf sheath. The eggs can hatch into larvae after 5-7 days, and the larvae can crawl to the garlic to eat. The rotten mother stage of garlic is the peak period for garlic maggots to lay eggs and hatch.

Control measures according to the weather and the occurrence characteristics of garlic maggots this year, the following effective control measures should be taken. (1) trapping and killing adults artificially. The trapping liquid can be prepared with brown sugar, vinegar and water at the ratio of 1 ∶ 1 ∶ 2.5. add sawdust and trichlorfon to mix well, put into the trapping basin, and trap and kill adults in garlic. In this way, killing adults before spawning can get twice the result with half the effort. (2) to drive out adults. In the adult oviposition period, 1.8% paracetamol 1000 times solution was used to kill adults and eggs, once every 7 days, twice in succession, to reduce the oviposition base of adults and reduce the harm. (3) applying nitrogen and sulfur fertilizer. Combined with watering and topdressing nitrogen and sulfur fertilizer which has a certain killing effect on garlic maggots can reduce the damage degree. (4) Chemical prevention and control. When diseased plants damaged by garlic maggots are found in the field, phoxim and chlorpyrifos can be applied with water or irrigated with roots before rain. Serious plots are reirrigated every 10 to 15 days.