Oviposition model of Cnaphalocrocis medinalis Guenée (Lepidoptera: Pyralidae)

Abstract

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±3.51days) and lowest at 35.0°C (6.4±0.48days). 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±1.09days) and shortest at 35.0°C (2.3±0.48days). 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.