Development and population growth rates of prorops nasuta (Hym., bethylidae) at constant temperatures
The effect of temperature on development and population growth of the parasitoid Prorops nasuta was investigated in the laboratory on its host Hypothenemus hampei, using constant temperatures of 18, 22, 27, 30 and 35°C. The highest mortality rates in juvenile stages of P. nasuta were found at 30 and 35°C, with 64.9 and 100%, respectively. The optimal temperature for development and survival of this parasitoid was at 27°C with 23.7% of mortality as juveniles. The stages with the highest mortality risk were egg and larva. Juvenile development time decreased with increasing temperature from 46.5 days at 18°C to 16.4 days at 30°C. The lower developmental threshold was estimated at 11.4°C and 297 degree-days are required to complete the development of P. nasuta from egg to adult. The life-span of females were inversely related to temperature. The 50% survival rate was reached at 137, 78, 40, 47 and 14 days at temperatures of 18, 22, 27, 30 and 35°C, respectively. The pre-oviposition time ranged from 119 days at 18°C to 19 days at 30°C. Similarly, the midpoint of oviposition, e.g. the day that 50% of eggs were laid, decreased with increasing temperature, taking place at 131, 63, 34 and 20 days at 18, 22, 27 and 30°C. Egg production was lower at 18°C whereas at 27°C the highest oviposition rates were obtained. At 35°C no oviposition occurred. A positive linear relationship was found between the intrinsic growth rate (rm) and temperature. This value was estimated to be -0.001, 0.023, 0.054 and 0.036 at temperatures 18, 22, 27 and 30°C, respectively. According to the response of P. nasuta in terms of development and population growth rates, the optimal range of constant temperatures must be between 19 and 29°C, with 27°C being the most favourable.
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| Format: | Texto biblioteca |
| Language: | eng |
| Subjects: | Café, Prorops nasuta, Broca del cafeto, Control biológico de plagas, |
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