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Interactions between Bactra verutana and the Development of Purple Nutsedge (Cyperus rotundus) Grown Under Three Temperature Regimes

Published online by Cambridge University Press:  12 June 2017

K. E. Frick ,
R. D. Williams  and
R. F. Wilson
K. E. Frick
Affiliation:
South. Weed Sci. Lab., Sci. Ed. Admin., Fed. Res., U.S. Dep. Agric, Stoneville, MS 38776
R. D. Williams
Affiliation:
South. Weed Sci. Lab., Sci. Ed. Admin., Fed. Res., U.S. Dep. Agric, Stoneville, MS 38776
R. F. Wilson
Affiliation:
South. Weed Sci. Lab., Sci. Ed. Admin., Fed. Res., U.S. Dep. Agric, Stoneville, MS 38776
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Abstract

For effective biological control through augmentation, Bactra verutana Zeller, would have to be released against purple nutsedge (Cyperus rotundus L.) in May and June when temperatures are cooler than they are from late July through September when maximal natural populations of this biological control agent occur. Bactra larvae exposed to simulated mid-May (24/13 C) and mid-June (29/18 C) temperature regimes developed more slowly than larvae exposed to the mid-July (32/26 C) temperature regime, but nutsedge plant growth was also slower. Thus, the relative amounts of feeding injury were similar at all three regimes. Larval feeding generally increased the number of shoots slightly, but not significantly, reduced significantly the production of inflorescences, and reduced the weight of total dry matter produced between 28 and 49%.

Keywords

Augmentationplant injuryseasonal developmentbiological control
Type
Research Article
Information
Weed Science , Volume 26 , Issue 6 , November 1978 , pp. 550 - 553
Copyright
Copyright © 1978 by the Weed Science Society of America 

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References

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