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Chilo partellus (Lepidoptera: Pyralidae) moth and larval response to levels of antixenosis and antibiosis in sorghum inbred lines under laboratory conditions

Published online by Cambridge University Press:  10 July 2009

J. van den Berg  and
M.C. van der Westhuizen
J. van den Berg
Affiliation:
ARC–Grain Crops Institute, Private Bag X1251, Potchefstroom, 2520 South Africa
M.C. van der Westhuizen
Affiliation:
Department of Zoology and Entomology, University of the Orange Free State, South Africa
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Abstract

Two experiments were conducted to determine Chilo partellus (Swinhoe) moth and larval response on sorghum lines differing in levels of antibiosis and antixenosis. The inbred lines were E 302, IS 2205, IS 2122 and SA 2681, all reportedly varying in levels of antibiosis and ovipositional and larval antixenosis to C. partellus. Ovipositional antixenosis was evaluated in choice tests under cage conditions and significant differences were observed in the average number of egg batches per line. E 302 received the greatest number of egg batches. Antibiosis and larval antixenosis was evaluated with artificial infestation in a greenhouse. Significant differences occurred in larval numbers and mean larval mass on different lines, with E 302 possessing the greatest level of antibiosis resistance. This study indicates that resistant genotypes such as E 302 may exhibit high levels of antibiosis or larval antixenosis, but may also be preferred for oviposition. The size of egg batches was not influenced by ovipositional antixenosis. The potential effect of ovipositional antixenosis mechanisms on pest populations under field conditions is discussed.

Type
Research Article
Information
Bulletin of Entomological Research , Volume 87 , Issue 5 , October 1997 , pp. 541 - 545
Copyright
Copyright © Cambridge University Press 1997

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