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The Asian citrus psyllid  Diaphorina citri  Kuwayama (Hemiptera: Liviidae) is an economically important pest of citrus because it serves as a vector of the causal pathogens of huanglongbing (HLB) also known as citrus greening disease. The increased use of insecticides for control of  D .  citri  negatively impacts several natural enemies including some effective ladybeetle species which are not available commercially. The two-spotted ladybeetle,  Adalia bipunctata  (Coleoptera: Coccinellidae) is found in some crop and forest ecosystems of Asia, Europe and North America and available commercially. It is known to attack aphids and mealybugs but there are no published records of feeding on psyllids. We evaluated suitability and preference of  A .  bipunctata  for nymphs of  D .  citri  compared to corn leaf aphid  Rhopalosiphum maidis  (Hemiptera: Aphididae) a global pest of cereal crops and prey for many predaceous insects. We also compared development and reproduction of  A .  bipunctata  on these two species with frozen eggs of the Mediterranean flour moth  Ephestia kuehniella  (Lepidoptera: Pyralidae) at 25°C. Initially, more  D .  citri  than  R .  maidis  nymphs were consumed in the no-choice tests although final consumption by larva and adult of  A .  bipunctata  did not differ in the choice and no-choice tests. Larval development was prolonged by one day on  D .  citri  compared to  R .  maidis  nymphs but did not differ between either of these diets and  E .  kuehniella . Larval survival to adult averaged 93–100% and was not impacted by diet. Adult life span did not differ between diets although those on  D .  citri  and  R .  maidis  nymphs weighed less and produced fewer but more fertile eggs than on  E .  kuehniella  eggs. Significant reduction of  D .  citri  nymphs averaging 54% was observed in colonies caged with adult  A .  bipunctata  on field planted citrus. R° (net reproductive rate) was least for beetles fed  R .  maidis , but otherwise there were no significant differences in demographic parameters. Successful feeding, development and reproductive performance of  A .  bipunctata  suggest its usefulness as biological control agent of  D .  citri  as well as aphid species exemplified by  R .  maidis .

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Two-Spotted Ladybeetle Adalia bipunctata L. (Coleoptera: Coccinellidae): A Commercially Available Predator to Control Asian Citrus Psyllid Diaphorina citri (Hemiptera: Liviidae)