Methods to measure performance of Grapholitha molesta on apples of five varieties

Yi Wang, Wei Na Kong, Long Long Zhao, Hui Ming Xiang, Li Jun Zhang, Jie Li, James Ridsdill-Smith, Rui Yan Ma

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

Host plants will affect the performance and population dynamics of the polyphagous insect pest Grapholitha molesta (Busck) (Lepidoptera: Tortricidae). Cultivar-level variability needs to be considered in assessing the performance of G. molesta. We evaluated the fitness of G. molesta on five apple varieties in the laboratory by placing eggs on apples and observing their performance including survival, development, and fecundity of the adult insect. Our results demonstrated differences between indices such as larval duration, pupal weight, egg production, length of tunnel, and exiting rate of larvae, which gave similar host rankings. Variety Danxia was less suitable than Jinqing and Shuohong, and more suitable than Empire and Jinxing. However, other indices such as pupal duration, total pre-oviposition time, and the estimated population parameters resulted in a different host ranking. We calculated weighted fitness scores to overcome the problem of inconsistent rankings. Empire changed from being the second highest ranking variety based on all population parameters to the second lowest using weighted fitness scores. The difference in ranking observed between apple varieties demonstrates the care needed in predicting population performance in the field using single traits.

Original languageEnglish
Pages (from-to)162-170
Number of pages9
JournalEntomologia Experimentalis et Applicata
Volume166
Issue number3
DOIs
Publication statusPublished - 1 Mar 2018

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