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The influence of plant age on tolerance of rice to injury by the rice water weevil, Lissorhoptrus oryzophilus (Coleoptera: Curculionidae)

Published online by Cambridge University Press:  09 March 2007

M.J. Stout ,
W.C. Rice  and
D.R. Ring
M.J. Stout*
Affiliation:
Department of Entomology, Louisiana State University Agricultural Center, 402 Life Sciences Building, Louisiana State University, Baton Rouge, LA 70803, USA
W.C. Rice
Affiliation:
USDA-ARS, Louisiana State University Rice Research Station, Box 1429, Crowley, LA 70527, USA
D.R. Ring
Affiliation:
Louisiana Cooperative Extension Service, Louisiana State University Agricultural Center, PO Box 25100, Baton Rouge, LA 70894-5100, USA
*
*Fax: (225) 578 1643 E-mail: mstout@agctr.lsu.ed
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Abstract

For most plant species, tolerance to many types of herbivory increases as plants age, but the applicability of this pattern to root herbivory has not been tested. Injury to roots of rice plants by larvae of the rice water weevil, Lissorhoptrus oryzophilus Kuschel, causes severe reductions in yields in the United States. It is generally thought that young rice plants, because their root systems are smaller, are less tolerant than older plants of root feeding by L. oryzophilus. Field experiments were conducted to test this hypothesis. Plots of rice (4.7 to 6.5 m2) were established and subjected to natural infestations of L. oryzophilus larvae. A soil insecticide was applied to plots at different times during the tillering phase of rice in order to manipulate the timing of weevil infestation. The impact of these treatments (timings of insecticide applications) was assessed by comparing relationships between yield loss and larval pressure for each treatment using analysis of covariance. Yield losses ranged from 13% to over 40% in plots not treated with insecticide. Patterns of yield losses from plots treated with insecticide at different times were best explained by the hypothesis that yield loss is determined both by the age of plants infested and by the size of larvae infesting plants. Young plants appear to be less tolerant than older plants, and feeding by large larvae appears to be more deleterious than feeding by smaller larvae. Management practices that delay infestation of rice by L. oryzophilus until plants are older may be an important component of management programmes for this pest.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 92 , Issue 2 , April 2002 , pp. 177 - 184
Copyright
Copyright © Cambridge University Press 2002

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