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
[Objective] We aimed to investigate the relationship between temperature and occurrence of Helicoverpa armigera (H0bner) in Shihezi Zong Chang. [Method] The data of occurrence of adult Helicoverpa armigera (Hubner...[Objective] We aimed to investigate the relationship between temperature and occurrence of Helicoverpa armigera (H0bner) in Shihezi Zong Chang. [Method] The data of occurrence of adult Helicoverpa armigera (Hubner) and temperature in 2007-2010 was analyzed for building the prediction model. [Result] The amount of overwintering generation of Helicoverpa armigera (Hubner) increased with the in- crease of temperature and its population dynamics showed a positive correlation with temperature. The amount of first and second generation of Helicoverpa armigera (Hubner) decreased with the increase of temperature and its population dynamics showed a negative correlation with temperature. [Conclusion] This research would provide a basis for the forecast and prevention of Helicoverpa armigera (Hubner) in North Xinjiang.展开更多
Field insect population survey indicated that the principal natural predation enemies of cotton bollworm ( Helicoverpa armigera Hubner ) were Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus...Field insect population survey indicated that the principal natural predation enemies of cotton bollworm ( Helicoverpa armigera Hubner ) were Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus Hsiao.The results from experiments showed that the amount of prey consumed of these principal natural enemies increased when the density of prey rised,and decreased when the density of natural enemies increased. The predation function response fitted Holling’s predation response equationⅡ,and could be fit with the Disk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[Objective] We aimed to investigate the relationship between temperature and occurrence of Helicoverpa armigera (H0bner) in Shihezi Zong Chang. [Method] The data of occurrence of adult Helicoverpa armigera (Hubner) and temperature in 2007-2010 was analyzed for building the prediction model. [Result] The amount of overwintering generation of Helicoverpa armigera (Hubner) increased with the in- crease of temperature and its population dynamics showed a positive correlation with temperature. The amount of first and second generation of Helicoverpa armigera (Hubner) decreased with the increase of temperature and its population dynamics showed a negative correlation with temperature. [Conclusion] This research would provide a basis for the forecast and prevention of Helicoverpa armigera (Hubner) in North Xinjiang.
文摘Field insect population survey indicated that the principal natural predation enemies of cotton bollworm ( Helicoverpa armigera Hubner ) were Eringonidium graminicola Sundevall, Adonia variegata Goeze, Nabis sinoferus Hsiao.The results from experiments showed that the amount of prey consumed of these principal natural enemies increased when the density of prey rised,and decreased when the density of natural enemies increased. The predation function response fitted Holling’s predation response equationⅡ,and could be fit with the Disk