论文部分内容阅读
在乐陵县青刺蛾是枣树的主要食叶害虫。据我们观察,青刺蛾一年1代,以老熟幼虫在枣树根颈周围0—10厘米深的土层中结茧越冬。翌年6月中旬(14—18日)为成虫羽化出土始期,6月下旬(22—27日)为高峰初期;7月上旬(2—6日)为羽化高峰期;卵历期6—10天,平均8天;幼虫一生共9龄,历期40.3天。 幼虫在5龄前仅食枣叶上表皮和叶肉,呈米粒大小的透明斑;从6龄进入暴食期,将枣叶咬成缺刻状。自幼虫孵化至暴食期历时15天左右。防治此害虫应在其暴食期前进行。 据我们试验,防治4—6龄幼虫:(1)喷撒20％杀灭菊脂5000倍液,杀虫率为96.7％;(2)喷撒晶体敌百虫800倍液和50％1605乳油1000倍液,杀虫率为100％
Qingling moth in Leling County is the main leaf-eating pest of jujube. According to our observation, the young loths a generation a year, with mature larvae in the jujube neck 0-10 cm deep around the soil in the winter cocoon. In the middle of June the following year (14-18 days) is the onset of emergence of adult feathers, late June (22-27) for the early peak; early July (2-6) peak emergence; egg duration of 6-10 days , An average of 8 days; a total of 9 larval life, duration 40.3 days. The larvae only eat jujube leaves on the epidermis and mesophyll before the 5th instar, showing transparent spots of grain size; from the 6th instar into the gluttonous period, the jujube leaves bite into a notch shape. Since the larvae hatch to gluttony lasted about 15 days. Control pests should be carried out before their binge eating period. According to our test, the control of 4-6 instar larvae: (1) Spray 20% to kill 5,000 times the liquid chrysanthemum, the insecticidal rate was 96.7%; (2) Spray crystals of trichlorfon 800 times and 50% 1605 EC 1000 times, insecticidal rate of 100%