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Orius  is an effective predatory bug of western flower thrips on chrysanthemum. However, long days are required to prevent reproductive diapause in  Orius , which is counter to the short-day flowering response in  Dendranthema . Two cut flower cultivars (`Manatee Iceberg' and `Naples') and a pot cultivar (`Boaldi') were given short days, long days with broad spectrum light, and long days with supplemental blue light (430–480 nm) at critical threshold levels. Blue light at intensities of 2 to 5 μmol·m –2 ·s –1  had no effect on flower induction, size, or dry weight or leaf dry weight compared to the short-day control. Increasing intensity and blue light exposure reduced flowering in the cut mum cultivars. At 25C, 77% of  Orius  females were reproductive in blue light compared to 75% in broad spectrum and 46% in short days. Spectral quality had no effect on fecundity, survival, or insect development rate. At least 90% of  Orius  reproduced with blue light at 19, 22, 25, and 28C. These results indicate possibilities for providing favorable conditions for biocontrol of arthropod pests on short-day crops.

Effect of Blue Light on Flowering in Dendranthema grandiflora and Diapause Induction in Orius insidiosus