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

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Show simple item record Michaud, J. P. Grant, Angela K. Jyoti, J. L. 2011-10-27T19:00:47Z 2011-10-27T19:00:47Z 2011-10-27
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 en_US
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 Article (publisher version) en_US 2007 en_US
dc.citation.issue 21 en_US
dc.citation.jtitle Journal of Insect Science en_US
dc.citation.volume 7 en_US
dc.contributor.authoreid jpmi en_US

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