摘要
通过对小菜蛾种群生命表的研究,确定蛹期“寄生”是影响小菜蛾种群的重要因子。昆虫生长调节剂IKI—7899对小菜蛾蛹期寄生天敌安全,以50ppm的剂量喷施后,小菜蛾幼虫各虫期累积死亡率达98.80％,并显著抑制种群的增长(种群趋势指效Ⅰ值为0.0009);常规药剂氯氰菊酯(200ppm),DDVP(1600 ppm)杀伤天敌,一个世代连续混合喷施4次,幼虫期累积死亡率仅为62.82％,种群显著增长(Ⅰ值为9.2769)。常规药剂的费用是IKI—7899的5倍多。
Based on the studies of life tables of diamondback moth (DBM),Pbatella xylostella (L.),'perasitization' at the pupae stage were established as the most important mortality factor for the population of DBM.The new style of insecticides (chitin synthesis inhibiting insecticide) IKI-7899 which was sprayed at the concentration of 50 ppm were promised to be favourable to the parasites,and could provide effective control of the DBM,with 98.80%of the control efficency for the larvae and 0.0009 of the population trend index (I),while conventional insecticides cypermethrin (200 ppm) and dichlorvos (1600 ppm),which were mixed used for four sprays at an interval of 4-5 days,in the whole generation were harmful to the enemies and could not effecctively control the DBM,with 62.82% of the control efficency and 9.2769 of the trend index (I).
出处
《华南农业大学学报》
CAS
CSCD
1992年第4期77-80,共4页
Journal of South China Agricultural University
基金
广东省科委基金
关键词
小菜蛾
生命表
药剂
蔬菜
害虫
Platella xyloslella(L.)
Life table
Insecticide
