核桃小吉丁虫足陕西省核桃主要害虫。一年发生一代,以老熟幼虫在受害枯枝中过冬,极少数在活枝上越冬。4月中旬至6月底为化蛹期,盛期为4月底至5月初。蛹期平均27.7天,最短16天,最长39天。成虫羽化后在蛹室中停留4—20天才咬破皮层钻出枝外。5月上旬至7月上旬为成虫出现期,盛期为5月下旬至6月上旬。幼虫化蛹结束时亦即成虫出现高峰。成虫出枝后取食核桃叶,约经半个月补充营养期开始产卵。产卵需要较高的温度和强光,卵多产在伸出树冠外围的长枝条上叶痕附近。成虫生活期平均35.3天,最长可达83天。6月上旬至7月下旬为卵出现期。卵期多为10天。6月中旬至8月上旬为幼虫孵化期,7月上旬为孵化盛期。幼虫多在二、三年生枝条皮层中串圈为害。受害严重时树叶变黄、脱落,枝条干枯。8月下旬幼虫老熟后开始钻入木质部,做一蛹室,在蛹室中过冬,至10月底大部幼虫进入了越冬阶段。 Small walnut Jiguan enough walnut foot pests in Shaanxi Province. A generation occurs a year, with mature larvae wintering in the dead branches, a handful of live wintering on live branches. From mid-April to the end of June pupation period, the peak for the end of April to early May. Pupal average 27.7 days, the shortest 16 days, the longest 39 days. Adult emergence in the pupal room stay 4-20 days before biting the cortex drilled branches. Early May to early July adult emergence period, the peak period from late May to early June. Adult larvae at the end of the pupal peak. Adult pests feed on the leaves of walnuts, about half a month after the beginning of nutrition to start spawning. Spawning requires a higher temperature and light, the egg prolific in the branches around the long crown out of leaf marks near. Adult life expectancy average 35.3 days, the longest up to 83 days. Early June to late July for the egg appearance. Egg period for more than 10 days. The larvae hatch from mid June to early August, and the peak of hatch in early July. More larvae in two or three-year-old branch cortex damage in the cortex. Serious damage when the leaves turn yellow, off, dry branches. In late August, larvae started to drill into the xylem after being cooked, and a pupae was housed in the pupa chamber for winter. By the end of October, most larvae had entered the overwintering stage.