Acta Entomologica Sinica (2006) 49, 302-309

Shu-Jun Wei, Hong-Hai Zheng, Wei-Guo Huangfu, Zu-Hua Shi and Xue-Xin Chen (2006)
[Division of larval instars of the citrus borer, Agrilus auriventris Saunders (Coleoptera: Buprestidae)]
Acta Entomologica Sinica 49 (2), 302-309
Abstract: The citrus borer, Agrilus auriventris Saunders, has caused outbreak on citrus trees in recent years in some areas of Zhejiang Province, China. The larval instar numbers should be determined before further studying on its life history, biology and IMP. In this study, larval samples of different instars were collected from both the field and the laboratory, and four variables were measured, including the width of peristoma, the width of urogomphi, the length of urogomphi and the left lateral length of urogomphi. Based on frequency histograms and Dyar's law, the larvae of citrus borer were divided into 5 instars. Of the four variables measured, the width of peristoma provided the best division of instars. The average width of peristoma of the 1st instar larvae was 0.1196±0.0013 mm, the 2nd instar 0.2008±0.0030 mm, the 3rd instar 0.3304±0.0041 mm, the 4th instar 0.5150±0.0049 mm and the 5th instar 0.7844±0.0040 mm. The best linear regression equation of the width of peristoma against the instar numbers was: y=-0.0766+exp (-1.9883+(0.3675)×x)(R²=0.9876).
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Xue-Xin Chen, Shu-Jun Wei, Zu-Hua Shi

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Agrilus auriventris	Citrus (genus)	China (south)