Predation of Orius sauteri on Spodoptera frugiperda larva.
In order to investigate the predation potential of Orius sauteri on larvae of Spodoptera frugiperda, predatory capacity of 3rd to 5th instar nymphs and female adults of O. sauteri on 1st to 3rd instar larvae of S. frugiperda and predation behavior were studied in laboratory. The results showed that O. sauteri just attacked 1st instar S. frugiperda larvae, and there was no significant difference in predation number between the predator nymph and adult within 24 hours (7-9 individuals). When S. frugiperda 1st instar larvae were used as the prey, feeding duration of the predator's 5th instar nymphs and female adults were 18.48 min and 18.29 min, respectively, which were significantly shorter than those of the 3rd and 4th instar nymphs (45.94 min and 43.79 min, respectively). No predation of S. frugiperda 2nd instar larvae was observed in 72 hours. In predation, O. sauteri pierced their stylets into any body part of S. frugiperda, such as head, thorax or abdomen. After finishing sucking one part, O. sauteri would quickly transfer to another part for suction, finally leaving only the empty skeletons of S. frugiperda. The study indicates that O. sauteri can attack newly hatched larvae of S. frugiperda and has great potential as a biological control agent for S. frugiperda.