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Lygus hesperus  Knight and  Lygus lineolaris  (Palisot de Beauvois) (Heteroptera: Miridae) are economically important plant bugs on many crops worldwide. However, these omnivores are also facultative predators on a wide variety of insects. This study was conducted to quantify and compare herbivory and carnivory exhibited among different lifestages of these two insect pests. The feeding activity of a total of 422 individuals was observed for 1 h each in feeding arenas containing a cotton leaf disk and copious amounts of the sweetpotato whitefly,  Bemisia tabaci  (Gennadius) (Hemiptera: Aleyrodidae) eggs, nymphs and adults. The  L. hesperus  and  L. lineolaris  lifestages examined included adults and 3 rd , 4 th  and 5 th  instar nymphs. Plant feeding occupied the majority of both species' time budget, regardless of the species or lifestage examined. There was a tendency for  L. lineolaris  lifestages to feed more often and for longer duration on plant tissue than  L. hesperus.  All lifestages of both species rarely fed on  B. tabaci,  but when they did, they preferred nymphs > adults > eggs. There were only a few cases where there were significant differences in predation rates and prey handling times exhibited among lifestages and between species, but juvenile  L. hesperus  tended to be more predaceous than juvenile  L. lineolaris  on whitefly nymphs and adults and 5 th instar and adult  L. lineolaris  were significantly more herbaceous than their  L. hesperus  counterparts. In addition, the younger individuals of both species tended to have greater prey handling times than their older counterparts. The significance of these findings is discussed.

journal of insect science

Diet Selection Exhibited by Juvenile and Adult Lifestages of the Omnivores Western Tarnished Plant Bug,<i>Lygus hesperus</i>and Tarnished Plant Bug,<i>Lygus lineolaris</i>

Diet Selection Exhibited by Juvenile and Adult Lifestages of the Omnivores Western Tarnished Plant Bug,Lygus hesperusand Tarnished Plant Bug,Lygus lineolaris