There are many insects on the leaves of carrots. What kind of insect is this? How?

The common diseases of carrots are black spot, black rot and bacterial soft rot, and the main pests are underground pests, aphids and root maggots.

In the prevention and control of black spot and black rot, it is necessary to select excellent varieties, rationally arrange, rotate crops, increase the application of organic fertilizer, weed through intertillage, cultivate strong seedlings without pests and diseases, and reduce the number of pests and diseases. Soak the seeds in warm soup, and dress the seeds with 70% mancozeb with 0.3% of the seeds. At the beginning of the disease, 75% chlorothalonil wettable powder is 600 times, or 50% prochloraz wettable powder 1500~2000 times, or 50% chlorpheniramine wettable powder 1000~ 1500 times, and sprayed every 10d.

In the prevention and control of bacterial soft rot, high ridge cultivation, timely digging out diseased plants, spraying quicklime, spraying 400 times neophytomycin or 400 times 72% agricultural streptomycin wettable powder for prevention and control.

Underground pests, such as grubs and needle worms, are controlled with 50% phoxim 2500 ~ 3000 times or Robam 2000 times. Use 5% chlorfenapyr and 10% imidacloprid 1500 times solution to control aphids. In the adult stage of root maggot, 2.5% dichlorvos EC can be sprayed 3000 times, every 7 days 1 time, 2 ~ 3 times in succession; At larval stage, the root was irrigated with 7.5L/hm2 of mirex or 40% of phoxim 15L/hm2.