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1 March 2009 Head Capsule Widths and the Rate of Development of the Instars of Codling Moth, Cydia pomonella (Linnaeus) (Lepidoptera: Tortricidae)
T.L. Blomefield, J.H. Giliomee
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Abstract

Head capsule widths of the instars of codling moth, Cydia pomonella (Linnaeus), a severe cosmopolitan pest of apples, were measured for laboratory-reared larvae and two cohorts of field-reared larvae. At the same time the accumulated degree days to reach the various instars was estimated. The results show that there were always five distinct instars. By measuring the head capsule width of larvae found inside infested apples and using the degree day data, pest managers can determine the instar, larvae age, and therefore when the fruit was entered. This information may give important clues towards understanding the reasons for control failure.

T.L. Blomefield and J.H. Giliomee "Head Capsule Widths and the Rate of Development of the Instars of Codling Moth, Cydia pomonella (Linnaeus) (Lepidoptera: Tortricidae)," African Entomology 17(1), 28-33, (1 March 2009). https://doi.org/10.4001/003.017.0104
Accepted: 1 January 2009; Published: 1 March 2009
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KEYWORDS
codling moth
Cydia pomonella
head capsule widths
instars
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