摘要
对烟田最重要的害虫之一斜纹夜蛾的优势种寄生性天敌———斜纹夜蛾侧沟茧蜂Microplitisprodeniae(Viereck)的生物学特性、田间自然消长及其对斜纹夜蛾的抑制作用进行了初步研究。结果表明 :该蜂田间种群消长一年有两个高峰期 ,第 1个高峰期 4月下旬 ,第 2个高峰期 6月中旬 ,对斜纹夜蛾有较好的控制作用。该蜂在 2 4～ 2 8℃ ,RH75 %～ 85 %下全日均可羽化 ,以凌晨 0 4∶0 0～ 0 6∶0 0时最多 ,羽化率达 3 9.8%。该蜂的羽化与湿度有关 ,相对湿度 75 %以上 ,羽化正常。雌蜂数量明显多于雄蜂 ,其性比雌∶雄平均为 2 .3 0∶1。补充营养及相对湿度对成蜂寿命有显著影响。补充营养能显著延长成蜂寿命 ,以 2 5 %蔗糖液最佳。成蜂寿命与相对湿度成正相关 ,其直线回归方程式为y=13 .75 97+ 0 .15 5lx。从该蜂接蜂至成茧 ,茧至羽化发育历期与湿度关系分别为N =13 4.0 42 6 (T -9.5 2 3 4)和N =84.95 5 8 (T -11.5 965 ) ,各温度下发育历期的理论值与实测值经卡方测验相符 。
This paper deals with the biology and ecology of Microplitis prodeniae (Viereck), a dominant braconid wasp parasited on Spodoptera litura Fabricius, one of the most important pests in tobacco fields. The wasp has two climaxes on population dynamics, one of which occurs at the last ten day of April and the other occurs at the mid-ten day of June, which can control its host in some degree. It emerges normally all day long at 24～28℃ and 75%～85% RH. But the emergence chiefly occurs at 4～6 am. The quantity of female wasp is more than that of the male's in the natural condition. The average sex ratio of the wasp is 2.30:1, The adult fed by nutrition expecially 25% solution of glucose can prolong their longevity significantly and the condition with higher hunidity is also beneficial to the adult survival. The equation between its longevity and hunidity can be described as y=13.759 7+0.155 1x. The relations between development duration and temperature from the stage of parasitism to incunabulum and incunabulum to emergence can be described as N=134.0426/(T-9.5234) and N=84.9558/(T-11.5965), respectively, the results of which fit in with χ 2 test.
出处
《江西农业大学学报》
CAS
CSCD
2003年第2期199-203,共5页
Acta Agriculturae Universitatis Jiangxiensis
