Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/9553
Title: Contradictions in host plant resistance to pests: spider mite ('Tetranychus urticae' Koch) behaviour undermines the potential resistance of smooth-leaved cotton ('Gossypium hirsutum' L.)
Contributor(s): Reddall, Anthony A (author); Sadras, Victor O (author); Wilson, Lewis J (author); Gregg, Peter  (author)orcid 
Publication Date: 2011
DOI: 10.1002/ps.2075
Handle Link: https://hdl.handle.net/1959.11/9553
Abstract: Background: Two-spotted spider mites ('Tetranychus urticae' Koch) oviposit near leaf veins or in leaf folds on the undersides of cotton ('Gossypium hirsutum' L.) leaves where the humid boundary layer offers protection from desiccation. The authors predicted that the boundary layer of glabrous cotton leaves should be shallower than that of hairy leaves, providing some resistance to mites. The dynamics of mite populations, leaf damage, leaf gas exchange and crop yield on two leaf hair isolines (smooth versus hairy) in two genetic backgrounds was assessed. Results: Mite colonies developed faster on the hairy leaf isolines, but leaf damage per mite was higher in smooth leaf isolines, indicating more intense damage. A 50% reduction in photosynthesis on the hairy isolines required 1.8 times more mites than smooth leaves. The yield of cotton was reduced in + mite treatments, but the magnitude of reduction was similar for hairy and smooth isolines. Conclusion: Paradoxically, the relative inhospitality of glabrous leaves may have induced mites to concentrate in protected leaf sections, causing more localised and more severe damage, negating the yield benefits from fewer mites. These results highlight interactions between leaf microenvironment, pest behaviour and plant productivity that may have implications for other instances of plant resistance.
Publication Type: Journal Article
Source of Publication: Pest Management Science, 67(3), p. 360-369
Publisher: John Wiley & Sons Ltd
Place of Publication: United Kingdom
ISSN: 1526-4998
1526-498X
Fields of Research (FoR) 2008: 070308 Crop and Pasture Protection (Pests, Diseases and Weeds)
Socio-Economic Objective (SEO) 2008: 820301 Cotton
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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