In low age larva is filled period the effect of prevention and cure to garlic root maggot undertakes different drug experiment and be investigated, the result makes clear: 27 years garlic root maggot produces 3 generation in Jiangsu, generation of live through the winter is imaginal in March the last ten-day of a month fills hair; the middle ten days of a month on April fills generation larva hair, the middle ten days of a month saw in May aurelian, the last ten-day of a month was; of fastigium of generation imago ascend to heaven and become immortal in May the 2nd generation is larval the first ten days of a month was filled to the middle ten days of a month in June hair, the last ten-day of a month came in June in September the last ten-day of a month with aurelian more summer, 2 generation are imaginal at; of the ascend to heaven and become immortal at the beginning of October coming by September the 3rd acting larval fastigium is on October the middle ten days of a month, the first ten days of a month is larval in November in succession pupate live through the winter, immediately following in time year of spring (the middle ten days of a month on April) begin emergence.

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