Environmental Effects on the Development and Survival of the Scale Insect Abgrallaspis cyanophylli (Signoret) (Homoptera: Diaspididae) with Reference to its Suitability for Use as a Host for Rearing Biological Control Agents. Ponsonby, D. J. & Copland, M. J. W. Biocontrol Science and Technology, 10(5):583–594, October, 2000. ![Environmental Effects on the Development and Survival of the Scale Insect Abgrallaspis cyanophylli (Signoret) (Homoptera: Diaspididae) with Reference to its Suitability for Use as a Host for Rearing Biological Control Agents [link]](https://bibbase.org/img/filetypes/link.svg "link")
Paper doi abstract bibtex Developmental and survival rates of the locally important diaspidid pest, Abgrallaspis cyanophylli (Signoret) reared on Solanum tuberosum L . tubers were examined under light and dark conditions; humidities of 33, 53, 62 and 75% relative humidity (RH); varying population densities; constant temperatures in the range of 20 to 30oC and at cycling temperatures of 12 h at 14°C and 12 h at 30°C. Developmental rate was slightly lower under constant light conditions but mortality was higher in the dark, particularly amongst the males. At 26°C, there were no differences in developmental rate in relation to the various humidity levels. However, survival was significantly lower at 33% RH, with females suffering higher mortality than males. Population density was found to have no effect on developmental rate or size of the females. Overall mortality increased in line with population density although the result was poorly correlated. Within the range 20-28°C developmental rate increased with rising temperature but decreased at 30°C. Thermal summation and polynomial regression data show a theoretical lower thermal threshold for development of 12.47°C. The thermal constant was 541.7 degree days. Survival was lowest at 20°C and 30°C and highest at temperatures in the median range and under cycling conditions. Male survival was significantly higher than that of the females at 30°C and under the cycling regime of 14/30°C. The results suggest that the optimum conditions for rearing A. cyanophylli on potatoes would be at temperatures in the range 24-26°C and humidities of 55-65% RH.
@article{ponsonby_environmental_2000,
title = {Environmental {Effects} on the {Development} and {Survival} of the {Scale} {Insect} {Abgrallaspis} cyanophylli ({Signoret}) ({Homoptera}: {Diaspididae}) with {Reference} to its {Suitability} for {Use} as a {Host} for {Rearing} {Biological} {Control} {Agents}},
volume = {10},
issn = {0958-3157, 1360-0478},
shorttitle = {Environmental {Effects} on the {Development} and {Survival} of the {Scale} {Insect} {Abgrallaspis} cyanophylli ({Signoret}) ({Homoptera}},
url = {http://www.tandfonline.com/doi/abs/10.1080/095831500750016389},
doi = {10.1080/095831500750016389},
abstract = {Developmental and survival rates of the locally important diaspidid pest, Abgrallaspis cyanophylli (Signoret) reared on Solanum tuberosum L . tubers were examined under light and dark conditions; humidities of 33, 53, 62 and 75\% relative humidity (RH); varying population densities; constant temperatures in the range of 20 to 30oC and at cycling temperatures of 12 h at 14\&\#176;C and 12 h at 30\&\#176;C. Developmental rate was slightly lower under constant light conditions but mortality was higher in the dark, particularly amongst the males. At 26\&\#176;C, there were no differences in developmental rate in relation to the various humidity levels. However, survival was significantly lower at 33\% RH, with females suffering higher mortality than males. Population density was found to have no effect on developmental rate or size of the females. Overall mortality increased in line with population density although the result was poorly correlated. Within the range 20-28\&\#176;C developmental rate increased with rising temperature but decreased at 30\&\#176;C. Thermal summation and polynomial regression data show a theoretical lower thermal threshold for development of 12.47\&\#176;C. The thermal constant was 541.7 degree days. Survival was lowest at 20\&\#176;C and 30\&\#176;C and highest at temperatures in the median range and under cycling conditions. Male survival was significantly higher than that of the females at 30\&\#176;C and under the cycling regime of 14/30\&\#176;C. The results suggest that the optimum conditions for rearing A. cyanophylli on potatoes would be at temperatures in the range 24-26\&\#176;C and humidities of 55-65\% RH.},
language = {en},
number = {5},
urldate = {2017-08-10},
journal = {Biocontrol Science and Technology},
author = {Ponsonby, D. J. and Copland, M. J. W.},
month = oct,
year = {2000},
pages = {583--594}
}
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Developmental rate was slightly lower under constant light conditions but mortality was higher in the dark, particularly amongst the males. At 26°C, there were no differences in developmental rate in relation to the various humidity levels. However, survival was significantly lower at 33% RH, with females suffering higher mortality than males. Population density was found to have no effect on developmental rate or size of the females. Overall mortality increased in line with population density although the result was poorly correlated. Within the range 20-28°C developmental rate increased with rising temperature but decreased at 30°C. Thermal summation and polynomial regression data show a theoretical lower thermal threshold for development of 12.47°C. The thermal constant was 541.7 degree days. Survival was lowest at 20°C and 30°C and highest at temperatures in the median range and under cycling conditions. Male survival was significantly higher than that of the females at 30°C and under the cycling regime of 14/30°C. 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