Functional response of Eocanthecona furcellata (Wolff) to the larvae of Spodoptera frugiperda (J. E. Smith).
Fall armyworm Spodoptera frugiperda (J. E. Smith) is a dangerous agricultural pest invaded China in 2019, and it has caused serious damage to crops in China. Screening and using local natural enemies to control S. frugiperda is an effective way to achieve sustainable control. The predatory stink bug Eocanthecona furcellata (Wolff) (Hemiptera; Pentatomidae), which is widely distributed in the subtropics and tropics, is a potential biological control agent for lepidopteran, coleopteran, and hemipteran pests. In this paper, the predation efficiency of E. furcellata to the larvae of S. frugiperda was evaluated by the predation functional response method. The results showed that the predation functional responses of the 3rd instar, 5th instar nymphs and female and male adults of E. furcellata to the 3rd and 5th instarrlarvae of S. frugiperda were fitted with the Holling-II equation. Under the condition of saturated prey density? the number of the 3rd instar larvae of S. frugiperda consumed _by E. furcellata were 32.20 (5th instar nymhh) > 19.40 (female adult) > 18.20 (male adult) > 6.60 (3rd instar nymph), and a/Th value (here a is the instantaneous attack rate, Th is the time used to handle a single prey) were 82.25 (5th instar nymph) > 40.39 (female adult) > 36.12 (male adult) > 17.19 (3rd instar nymph). The number of the 5th instar larvae of S. frugiperda consumed by E. furcellata were 7.80 (5th instar nymph) >6.40 (female adult) >5.50 (male adult) >4.60 (3rd instar nymph), and a/Th value were 11.36 (5th instar nymph) > 10.75 (female adult) >9.63 (male adult) > 7.45 (3rd instar nymph). This results indicated that E. furcellata had a strong predation capacity against the larvae of S. frugiperda, especially the 5th instar nymphs, female and male adults, which provides the scientific basis and technical support for the application of E. furcellata to control S. frugiperda.