The cotton bollworm, Heliothis armigera (Hubner) is an important insect species at-tacking many crops. Their performances have been examined at temperatures from 15℃ to 35℃ and relative humidities (RH) between 22.5%...The cotton bollworm, Heliothis armigera (Hubner) is an important insect species at-tacking many crops. Their performances have been examined at temperatures from 15℃ to 35℃ and relative humidities (RH) between 22.5% and 100%, respectively, in order to assess possible effect of climate in future on its occurrence and infestation. Durations of all developmental stages of the insect shortened with increasing temperature. The temperature favoring population growth ranged from 25℃ to 30℃.Larval duration and adult longevity decreased as relative humidity increased, but development of other stages was independent of RH. At RH of over 64%, their survival rate, egg production and oviposition rate varied a little, and all the population parameters of the insect remained at a relative constant level.展开更多
In the early 1970s, Riddiford and Williams found that removal of pupal corpora cardiaca prevented calling behaviour in the silkmoth Antheraea polyphemus and Hyalophora cecropia. However, the reinvestigation by Sasaki ...In the early 1970s, Riddiford and Williams found that removal of pupal corpora cardiaca prevented calling behaviour in the silkmoth Antheraea polyphemus and Hyalophora cecropia. However, the reinvestigation by Sasaki on these two insects could not confirm it. Hollander and Yin reported that section of circumoesopha-展开更多
文摘The cotton bollworm, Heliothis armigera (Hubner) is an important insect species at-tacking many crops. Their performances have been examined at temperatures from 15℃ to 35℃ and relative humidities (RH) between 22.5% and 100%, respectively, in order to assess possible effect of climate in future on its occurrence and infestation. Durations of all developmental stages of the insect shortened with increasing temperature. The temperature favoring population growth ranged from 25℃ to 30℃.Larval duration and adult longevity decreased as relative humidity increased, but development of other stages was independent of RH. At RH of over 64%, their survival rate, egg production and oviposition rate varied a little, and all the population parameters of the insect remained at a relative constant level.
文摘In the early 1970s, Riddiford and Williams found that removal of pupal corpora cardiaca prevented calling behaviour in the silkmoth Antheraea polyphemus and Hyalophora cecropia. However, the reinvestigation by Sasaki on these two insects could not confirm it. Hollander and Yin reported that section of circumoesopha-
