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Laboratory studies were conducted to assess the effect of temperature on the development and survival of the indigenous parasitoid Pnigalio pectinicornis L. on the citrus leaf miner Phyllocnistis citrella Stainton as host, fed on leaves of Citrus sinensis L. Osbck cultivar Washington navel and Citrus reticulata Blanco cultivar Clementine. Experiments were conducted at five constant temperatures ranging from 15 to 32.5 degrees C, with 60 +/- 10% RH and a photoperiod of 14:10 (L:D) h. The relationship between the developmental rate and temperature was determined using both linear and nonlinear (Lactin's formula) models. Developmental time of immature stages tended to be shorter as the temperature increased the range from 15 to 30 degrees C. Mortality was greater at the temperatures extreme tested. Both linear and nonlinear models provided a reliable fit of developmental rates versus temperature for all immature stages. Developmental thresholds that were estimated by the linear model for eggs were higher than those estimated by the nonlinear model. However, higher values of the low developmental threshold for larva and pupa stage of P. pectinicornis were estimated by the Lactin-2 model than that by the linear model. The potential of these models to predict the phenology of this parasitoid and its biological characteristics found in this study are discussed for its proper use as a biological control agent.

environmental entomology

Effect of Temperature on Development and Survival of the Parasitoid &lt;I&gt;Pnigalio pectinicornis&lt;/I&gt; (Hymenoptera: Eulophidae) Reared on &lt;I&gt;Phyllocnistis citrella&lt;/I&gt; (Lepidoptera: Gracillariidae)