Impact of the stem borer, Dectes texanus, on yield of the cultivated sunflower, Helianthus annuus.

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dc.contributor.author Michaud, J. P.
dc.contributor.author Grant, Angela K.
dc.contributor.author Jyoti, J. L.
dc.date.accessioned 2011-10-27T19:00:47Z
dc.date.available 2011-10-27T19:00:47Z
dc.date.issued 2007-04-12
dc.identifier.uri http://hdl.handle.net/2097/12450
dc.description Citation: Michaud, J., Grant, A., & Jyoti J. (2007). Impact of the stem borer, Dectes texanus, on yield of the cultivated sunflower, Helianthus annuus. Journal of Insect Science, 7(21), 1-14. https://doi.org/10.1673/031.007.2101
dc.description.abstract Foliar and soil-drench insecticide treatments were used in attempts to manipulate infestation of cultivated sunflower plants, Helianthus annuus LeConte (Asterales: Asteraceae) by Dectes texanus LeConte, (Coleoptera: Cerambycidae) a serious pest of sunflowers in the High Plains of the USA. Seed yields were assessed on a per-plant basis for both oilseed and confection type sunflower hybrids in two years. Both insecticide treatments (foliar λ-cyhalothrin and soil-drench carbofuran) improved yield of oilseed sunflowers in 2004, but not in 2005. Yield of confection hybrids was improved by a systemic fungicide (thiophanate methyl) in 2005, but insecticides did not improve yield in either year. Both insecticide treatments gave good control of various stalk-boring insects such as Cylindrocopturus adspersus (Coleoptera: Curculionidae), Mordellistena sp. (Coleoptera: Mordellidae), and Pelochrista womanana (Lepidoptera: Tortricidae), but neither gave better than 50% control of D. texanus. Plants were sorted according to the presence or absence of D. texanus larvae and no reduction was found in total seed weight, seed size, or oil content as a result of infestation. However, mature larvae of D. texanus girdle stalks at the base in preparation for overwintering, a behavior that reduced stalk breakage force by 34–40%, leading to yield losses through lodging. At harvest in 2005, there were differences between cultivars and among treatments in the proportions of D. texanus larvae that had girdled their plants at harvest. It was concluded that further research aimed at reducing crop losses to D. texanus should focus on means of delaying stalk desiccation and/or deterioration, factors that appear to trigger girdling behavior. en_US
dc.relation.uri https://doi.org/10.1673/031.007.2101 en_US
dc.rights © 2006 The Authors. This is an open access paper. We use the Creative Commons Attribution 2.5 license that permits unrestricted use, provided that the paper is properly attributed.
dc.rights https://creativecommons.org/licenses/by/2.5/
dc.subject Ataxia hubbardi en_US
dc.subject Cylindrocopturus adspersus en_US
dc.subject Girdling en_US
dc.subject Mordellistena sp. en_US
dc.subject Lodging en_US
dc.subject Insects en_US
dc.subject Pelochrista womanana en_US
dc.title Impact of the stem borer, Dectes texanus, on yield of the cultivated sunflower, Helianthus annuus. en_US
dc.type Text en_US
dc.date.published 2007 en_US
dc.citation.doi 10.1673/031.007.2101
dc.citation.epage 14
dc.citation.issn 1536-2442
dc.citation.issue 21 en_US
dc.citation.jtitle Journal of Insect Science en_US
dc.citation.spage 1
dc.citation.volume 7 en_US
dc.citation Michaud, J., Grant, A., & Jyoti J. (2007). Impact of the stem borer, Dectes texanus, on yield of the cultivated sunflower, Helianthus annuus. Journal of Insect Science, 7(21), 1-14. https://doi.org/10.1673/031.007.2101
dc.contributor.authoreid jpmi en_US
dc.description.version Article: Version of Record


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