Ontogeny of Cotesia ruficrus, a Parasitoid of Spodoptera frugiperda

doi:10.16409/j.cnki.2095-039x.2023.01.003

Abstract

Abstract: The fall armyworm, Spodoptera frugiperda (Lepidoptera: Noctuidae), is a major invasive pest worldwide. Since its invasion into China in 2019, S. frugiperda has posed a serious threat to China’s agricultural production and food security. It is of great importance to excavate, screen and evaluate domestic dominant natural enemy resources for the biological control of this insect pest. In 2020, the larvae of S. frugiperda parasitized by Cotesia ruficrus were first collected in the main corn producing areas of Shaanxi Province, and this is also the first report in China that the native parasitoid C. ruficrus parasitizes S. frugiperda larvae. In this paper, the ontogenetic history and developmental time of C. ruficrus were reported in detail to aid the development of biological control program of S. frugiperda by utilizing C. ruficrus in the future. The developmental stages of C. ruficrus include egg, larva, pupa and adult. The egg has a stalk and hatches 3 days after oviposition. The larva has three instars; the 1^st instar larva has keratinized jaws; the 2^nd instar larva has developed tail sacs; and the 3^rd instar larva has degenerated tail sacs. The 3^rd instar larva bits through body wall of S. frugiperda larva and climbs out from S. frugiperda larva, and cocoons and pupates nearby. The pupa emerges 3 days after pupation. The mean developmental durations of egg, first instar, second instar, third instar, pupa, and egg-adult of C. ruficrus are 3.1 d, 2.1 d, 3.2 d, 1.0 d, 3.0 d, and 12.4 d, respectively.

Key words: Cotesia ruficrus, Spodoptera frugiperda, ontogenetic history, parasitoid, biological control

CLC Number:

S476.3

HE Pengyang, LI Xian, LIU Tongxian, ZHANG Shize. Ontogeny of Cotesia ruficrus, a Parasitoid of Spodoptera frugiperda[J]. Chinese Journal of Biological Control, 2023, 39(6): 1488-1494.

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