The current experiment was conducted to find out the optimal conditions for mass rearing and developmental changes of Cyclosainsulana. The lab. conditions were maintained at （27±2）℃ and （65±5）% RH. The ...The current experiment was conducted to find out the optimal conditions for mass rearing and developmental changes of Cyclosainsulana. The lab. conditions were maintained at （27±2）℃ and （65±5）% RH. The clear perplex cages and natural diet consisting of the aphids, larvae of the house fly and larvae of drosophila were used for rearing. C. insulana took （123.12±7.26） days to develop from eggs to adults passing through eight instars under prevailing vivo conditions. The eggs were greenish white in color with average size of 0.57 mm ±0.034. The eggs spent （7.52±1.64） days in emergence. Maximum number of spiderlings survived at the 5th instar （84%） and minimum at the 1st instar （34%）. The measurements of different body parts including the total body length, cephalothorax and pedipalps of the both male and female C. insulana were done with the help of micrometer and presented as mean± SD. The measurements varied in the each developing instar. It was concluded that spiders were difficult to rear in the lab. conditions and each developing stage which was regarded as instars showed variations in size colors and body characteristics.展开更多
为弄清榆木蠹蛾Holcocerus vicarius Walker幼虫的发育情况及预测其发生时间,通过测量榆木蠹蛾幼虫的头壳宽、体长、体宽、前胸背板宽、上颚长和上颚宽,运用Crosby生长法则和线性回归方法分析来找出判定幼虫龄数的最佳形态指标,推断其...为弄清榆木蠹蛾Holcocerus vicarius Walker幼虫的发育情况及预测其发生时间,通过测量榆木蠹蛾幼虫的头壳宽、体长、体宽、前胸背板宽、上颚长和上颚宽,运用Crosby生长法则和线性回归方法分析来找出判定幼虫龄数的最佳形态指标,推断其幼虫的龄数。结果表明:各龄幼虫头壳宽平均值的变异系数和Crosby指数最小,其他5项指标的变异系数和Crosby指数较大,头壳宽为最佳分龄指标。根据头壳宽将榆木蠹蛾幼虫分为20龄,不同龄幼虫头壳宽值符合Dyar定律提出的幼虫头壳宽增长规律,头壳宽和龄数的回归方程为y=0.233+1.686x+0.127x2-0.005x3(R2=0.996)。榆木蠹蛾幼虫龄数的确定为研究其发生规律、生物学习性及进行综合防治提供依据。展开更多
The toxicity of insecticides to S.exigua different in generations and instars was tested by topical application. The results that the toxicity of alpha cypermethrin, methomyl, profenofos, and chlorfluazuron to 4th ins...The toxicity of insecticides to S.exigua different in generations and instars was tested by topical application. The results that the toxicity of alpha cypermethrin, methomyl, profenofos, and chlorfluazuron to 4th instar was decreased among second, fourth and sixth generations, and that of alpha cypermythrin, methomyl, profenofos, and chlorfluazuron to third, fourth and fifth instar of sixth generation was also decreased. These gave a viewpoint that the resistance develops very quickly with the generations and instars increasing.展开更多
文摘The current experiment was conducted to find out the optimal conditions for mass rearing and developmental changes of Cyclosainsulana. The lab. conditions were maintained at （27±2）℃ and （65±5）% RH. The clear perplex cages and natural diet consisting of the aphids, larvae of the house fly and larvae of drosophila were used for rearing. C. insulana took （123.12±7.26） days to develop from eggs to adults passing through eight instars under prevailing vivo conditions. The eggs were greenish white in color with average size of 0.57 mm ±0.034. The eggs spent （7.52±1.64） days in emergence. Maximum number of spiderlings survived at the 5th instar （84%） and minimum at the 1st instar （34%）. The measurements of different body parts including the total body length, cephalothorax and pedipalps of the both male and female C. insulana were done with the help of micrometer and presented as mean± SD. The measurements varied in the each developing instar. It was concluded that spiders were difficult to rear in the lab. conditions and each developing stage which was regarded as instars showed variations in size colors and body characteristics.
文摘为弄清榆木蠹蛾Holcocerus vicarius Walker幼虫的发育情况及预测其发生时间,通过测量榆木蠹蛾幼虫的头壳宽、体长、体宽、前胸背板宽、上颚长和上颚宽,运用Crosby生长法则和线性回归方法分析来找出判定幼虫龄数的最佳形态指标,推断其幼虫的龄数。结果表明:各龄幼虫头壳宽平均值的变异系数和Crosby指数最小,其他5项指标的变异系数和Crosby指数较大,头壳宽为最佳分龄指标。根据头壳宽将榆木蠹蛾幼虫分为20龄,不同龄幼虫头壳宽值符合Dyar定律提出的幼虫头壳宽增长规律,头壳宽和龄数的回归方程为y=0.233+1.686x+0.127x2-0.005x3(R2=0.996)。榆木蠹蛾幼虫龄数的确定为研究其发生规律、生物学习性及进行综合防治提供依据。
文摘The toxicity of insecticides to S.exigua different in generations and instars was tested by topical application. The results that the toxicity of alpha cypermethrin, methomyl, profenofos, and chlorfluazuron to 4th instar was decreased among second, fourth and sixth generations, and that of alpha cypermythrin, methomyl, profenofos, and chlorfluazuron to third, fourth and fifth instar of sixth generation was also decreased. These gave a viewpoint that the resistance develops very quickly with the generations and instars increasing.
