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Your Position :Home->Past Journals Catalog->2020年57 No.5

Determination of larval instars of Holotrichia oblita (Coleoptera: Melolonthidae)
Author of the article:LU Jun-Jiao;REN Mei-Feng;LI Da-Qi;GAO Xiao-Yun;YANG Jing;DONG Jin-Ming
Author's Workplace:College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan 030031, China;College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan 030031, China;College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan 030031, China;College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan 030031, China;College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan 030031, China;College of Plant Protection, Shanxi Agricultural University, Shanxi Key Laboratory of Integrated Pest Management in Agriculture, Taiyuan 030031, China
Key Words:Holotrichia oblita; instar number; instar duration; head capsule width; eye spacing; antenna spacing
Abstract:
[Objectives]  Holotrichia oblita is a kind of serious subterranean pest with long larval stage, which is difficult to distinguish the instar. In order to clarify the development status of the larva and accurately classify the instar, the theoretical basis is provided for the prediction and prevention measures. [Methods]  Instars of H. oblita were studied by measuring 8 indexes of body width, head length, head capsule width, antenna length, antenna distance, ocellus distance, upper lip width and body weight. A frequency distribution analysis and the Dyar’s rule were used to determine the number of larval instars, which was tested using Crosby’s growth rule and linear regression and exponential regression. [Results]  We found that the larvae of H. oblita could separated by head capsule width, eye spacing and antenna spacing into 3 instars. The range of head capsule width from the 1st to 3th instar was 1 496-4 260 μm, 4 261-6 631 μm, 6 631-9 000 μm. The range of antenna spacing from the 1st to 3th instar was 500-2 840 μm, 2 841-3 880 μm, 3 881-5 700 μm. The range of eye spacing from the 1st to 3th instar was 1 000-4 120 μm, 4 121-6 070 μm, 6 071-8 800 μm. [Conclusion]  The results indicated that head capsule width, eye spacing and antenna spacing could be used for the separation of instars, and that the larvae of H. oblita have 3 instars.
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