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竹笋夜蛾在陕西竹林区普遍发生,局部成灾,竹笋被害率达60—90％。一年发生一代,以卵在莎草科杂草上越冬。3月中旬孵化,在杂草上取食,幼虫有5龄。5月上旬竹笋出土时,幼虫至3龄转移到笋内蛀食,被害竹笋断落、腐烂,招引江苏泉蝇寄生。幼虫在笋内为害20—25天,脱笋入土化蛹。竹林郁闭度小、林间空地大、经营管理差、杂草多处发生严重。试用40％辛硫磷乳油、40％久效磷乳油1000倍液,防治杂草上初龄幼虫,列亡率可达78—81％,竹笋被害降低率在70％以上。捡拾虫退笋、清除杂草、喷药防治是综合治理的三条主要途径。
Bamboo shoots were widespread in bamboo groves in Shaanxi Province. Some were affected by the disaster and the rate of bamboo shoots was 60-90%. A generation occurs a year, with the eggs overwinter in the sedge weed. Hatching in mid-March, feeding on weeds, 5th instar larvae. When bamboo shoots were unearthed in early May, the larvae were transferred to bamboo shoots by the 3rd instar to eclipse them. The bamboo shoots were damaged and decayed, attracting parasites from spring flies in Jiangsu Province. Larvae in the shoot damage 20-25 days, off bamboo shoots into pupation. Bamboo forest canopy density, large open space, poor management, weeds in many places serious. Try 40% phoxim EC, 40% monocrotophos EC 1000 times, control weeds on the first instar larvae, the mortality rate of up to 78-81%, bamboo shoots reduce the rate of more than 70%. Pick bamboo shoots back to shoots, remove weeds, spraying prevention and control is the three major ways of comprehensive management.