Temperature-dependent development and fecundity of Scirtothrips dorsalis (Thysanoptera: Thripidae) on blueberry (Ericaceae)

Abstract

Scirtothrips dorsalis Hood (Thysanoptera: Thripidae) is a global pest that causes severe damage to blueberries (Ericaceae). Current management strategies rely heavily on intensive insecticide use, which can adversely affect beneficial organisms and promote the evolution of insecticide resistance. The development of sustainable control methods against S. dorsalis requires basic information about its bioecology. This study investigates the effect of temperature on the development, survival, and reproduction of S. dorsalis when reared on blueberries. The results indicate that temperature significantly affects preimaginal developmental time and female S. dorsalis fecundity. The developmental time was longer at 18 °C (36.6 days) than at 30 °C (9.6 days). Temperature significantly affected longevity, with females living longer at 24 °C, with an average lifespan of 14.9 days, compared to 9.5 days at 30 °C. The highest daily oviposition rate was observed at 24 °C, averaging 2.8 eggs/day, whereas the lowest rate occurred at 18 °C, averaging 0.2 eggs/day. The lower developmental threshold was estimated to be 13.6 °C, and the thermal constant, 169.5 degree-days. The findings provide essential information on the development and reproduction of S. dorsalis , which could be useful for predicting field populations and implementing appropriate management strategies for this pest.