Predation Effect of Sycanus croceovittatus on the 3rd-Instar Larvae of Spodoptera exigua

doi:10.16409/j.cnki.2095-039x.2023.03.001

Abstract

Abstract: Sycanus croceovittatus (Hemiptera: Heteraptera: Reduviidae)，a widely distributed predatory natural enemy in the southern provinces of China, is a potential biological control agent for lepidopteran, coleopteran and hemipteran pests. In order to evaluate the potential of Sy. croceovittatus to control Spodoptera exigua (Lepidoptera: Noctuidae), the 3rd–5th-instar nymphs and adults of Sy. croceovittatus were tested in laboratory condition for their predation functional responses and searching effects on the 3rd-instar larvae of Sp. exigua at different densities, as well as for the effect of conspecific density interference. The results showed that the predation amount of Sy. croceovittatus increased significantly with the increase of prey density, and the 5th-instar nymphs had the highest predation on the 3rd-instar larvae of Sp. exigua. The predation functional responses of Sy. croceovittatus at different stages fitted well with both Holling Ⅱ and Holling Ⅲ models. In the Holling II model, the 3rd-5th-instar nymphs and female and male adults of Sy. Croceovittatus had the daily maximum consumption of 9.12, 11.42, 22.86, 23.74 and 23.09, and the predation capacity of 12.63, 15.56, 29.04, 24.04 and 16.83, respectively. According to the Holling Ⅲ model, the 3rd-5th-instar nymphs and female and male adults of Sy. croceovittatus had the daily maximum consumption of 8.35, 10.06, 17.54, 16.52 and 14.15, and the optimal searching density of 3.92, 4.46, 7.20, 7.87 and 8.69 per box, respectively. The searching effect was negatively correlated with the pest density, and the conspecific density interference effect was positively correlated with the density of natural enemy. In conclusion, the 5th-instar nymphs had the higher predation ability on the 3rd-instar larvae of Sp. exigua than other developmental stages of Sy. croceovittatus..

Key words: Sycanus croceovittatus, Spodoptera exigua, predation functional response, searching effect, conspecific density interference effect

CLC Number:

S476.2

CHEN Suyi, ZHAO Ping, SHI Anxian, SHI Aimin, WANG Chunya, CAI Wanzhi, LI Hu. Predation Effect of Sycanus croceovittatus on the 3rd-Instar Larvae of Spodoptera exigua[J]. Chinese Journal of Biological Control, 2023, 39(2): 289-296.

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