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Chinese Journal of Biological Control ›› 2023, Vol. 39 ›› Issue (2): 346-354.DOI: 10.16409/j.cnki.2095-039x.2023.03.004

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Effect of Different Host Plants on the Growth and Development of Spodoptera exigua (Hübner) and Its Host Selection

WANG Kai1, CHENG Yuming1,2, SUN Qingming3, YANG Yizhong1, SU Honghua1   

  1. 1. College of Plant Protection, Yangzhou University, Yangzhou 225009, China;
    2. Lianyungang Customs, Lianyungang 222000, China;
    3. Institute of Fruit Tree Research, Guangdong Academy of Agricultural Sciences/Key Laboratory of South Subtropical Fruit Biology and Genetic Resource Utilization (MOA), Guangzhou 510640, China
  • Received:2021-06-04 Published:2023-04-13

Abstract: Spodoptera exigua (Hübner) is a polyphagous pest that causes serious damage to crops, vegetables and flowers. In this paper, we investigated the effects of different host plants on the growth, development and reproduction of S. exigua after feeding on different host plants, and the host selection behavior of S. exigua adults for oviposition and larval feeding on different host plants, using celery Apium graveolens, amaranth Amaranthus retroflexus, split onion Allium fistulosum L. var. caespitosum Makino and bok choy Brassica chinensis as subjects. The results showed that S. exigua larvae developmental epochs, pupae weight, egg number and other parameters differed significantly among host plants. S. exigua larvae that fed on split onion had the longest developmental duration and those that fed on Amaranthus had the shortest developmental duration. The heaviest pupae and the highest egg number were found in those feeding on bok choy, while the lowest egg number was found in those feeding on celery and the lightest pupae were found in those feeding on split onion. It was found that the S. exigua were able to reproduce on all four host plants, among which, amaranth and bok choy were more favorable host plants than celery and split onion. The order of egg number on the four host plants was: amaranth (222.1 eggs/♀), split onion (181.6 eggs/♀), celery (96.3 eggs/♀), bok choy (26.2 eggs/♀). In the larval host selection test, the S. exigua had the highest feeding selection rate on bok choy and the lowest on split onion; and the 3rd instar larvae were the most selective and the 5th instar larvae were relatively less selective. The results showed that the egg-laying selection of adults and larval feeding selection were not consistent, while the larval feeding selection was consistent with their growth and development trends, which provides scientific support for the use of push-pull strategy to prevent and control S. exigua.

Key words: Spodoptera exigua, host plant, growth and development, host selection

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