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Effect of light on the longevity and fecundity of Venturia canescens (Gravenhorst) (Hymenoptera: Ichneumonidae)
(Zoological Soc Pakistan, 2007) Sahin, Ali Kursat; Ozkan, Cem
The effect of light on the longevity and fecundity of Venturia canescens (Gravenhorst) (Hymenoptera: Ichneumonidae) was investigated at 25+/-1 degrees C temperature and 60-70 % relative humidity. In the experiment, V. canescens was reared in L0:D24 (continuous darkness) and L16:D8 (2000 and 5000 lux light intensities), and the longevity and fecundity of the parasitoid were defined at these conditions. The results indicated that photoperiod and light intensity significantly affected the longevity and fecundity of the parasitoid. The maximum average longevity was found to be 583.92+/-43.46 hours in continuous darkness. The average longevity of the parasitoid decreased in L16:D8 (15.17% and 25.35% in 2000 and 5000 lux light intensities, respectively). Similarly, the maximum average fecundity was found as 193.02+/-4.45 in L0:D24 and average fecundity of the parasitoid decreased in L16:D8 (10.53% and 30.78% in 2000 and 5000 lux light intensity treatments, respectively). The findings of this investigation confirm that photoperiod and light intensity could have potential for improving biological control efficacy of V canescens in grain storage warehouses.