Oviposition model of Cnaphalocrocis medinalis Guenée (Lepidoptera: Pyralidae)

• Longevity and fecundity of Cnaphalocrocis medinalis were significantly influenced by temperature.
• The age-specific survival rate was explained by a sigmoid function.
• The age-specific cumulative oviposition rate was described by the three-parameter Weibull function.

The longevity and fecundity of Cnaphalocrocis medinalis were investigated at temperatures of 15.0, 17.5, 20.0, 22.5, 25.0, 27.5, 30.0, 32.5, and 35.0 °C. Adult longevity and fecundity were significantly influenced by temperature. Longevity decreased with increasing temperature: it was highest at 15.0 °C (23.6 ± 3.51 days) and lowest at 35.0 °C (6.4 ± 0.48 days). Fecundity was highest at 25.0 °C (170.5 ± 45.54 eggs) and lowest at 17.5 °C (11.0 ± 3.68 eggs). The oviposition period was longest at 20.0 °C (8.0 ± 1.09 days) and shortest at 35.0 °C (2.3 ± 0.48 days). The oviposition model presented in this study consisted of two reproductive components (total fecundity and age-specific cumulative oviposition rate) and a survival component (age-specific survival rate). The relationship between adult developmental rate and temperature was described by the Lactin 2 model (r2 = 0.98, p < 0.0001). The age-specific survival rate was well explained by a sigmoid function (r2 = 0.97, p < 0.00001). The age-specific cumulative oviposition rate was best described by the three-parameter Weibull function (r2 = 0.99, p < 0.00001). Temperature-dependent fecundity was estimated using the Briere-2 model (r2 = 0.94, p < 0.007). Daily egg production of C. medinalis in relation to adult age and temperature was estimated.

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