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| Titel: |
Temperature-dependent life attributes of an aphidophagous ladybird, Propylea dissecta |
| Auteur: |
Pervez, Ahmad |
| Verschenen in: |
Biocontrol science and technology |
| Paginering: | Jaargang 14 (2004) nr. 6 pagina's 587-594 |
| Jaar: |
2004-09 |
| Inhoud: |
Reproductive attributes, age-specific fecundity and natality based life-tables of an aphidophagous ladybird, Propylea dissecta (Mulsant) were investigated at five temperatures, using aphid, Aphis gossypii as prey. Pre-oviposition period decreased significantly with increase in temperature up to 27°C and thereafter increased at a slower rate. Egg viability dropped significantly at temperature extremes. Females lived longer than males; however, longevity decreased significantly with increase in temperature. The predicted total fecundity and oviposition rate were 952.54 eggs and 35.15 eggs per day at 27°C predicted by a mathematical model compared to empirical estimates of 856.00±30.00 eggs and 39.7±2.26 eggs per day. Age-specific fecundity was triangular and temperature dependent. The peak in oviposition rate occurred earlier at higher temperatures. The highest values of net reproductive rate (Ro=431.1), intrinsic rate of increase (rm=0.2134 day-1) and finite rate of increase (λ=1.2379 day-1) were recorded at 27°C, which suggests it is the optimum temperature for the mass rearing of P. dissecta. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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