Claim · model-written summary
Insecticides did not improve confection sunflower yield in either year.
- Taxon
- Helianthus annuus
Helianthus annuuse0 - Treatment
- insecticidese2
- Outcome
- yielde2
- Direction
- did not improvee2
- Qualifier
- in either yeare2
Not reportedMaterialGeneCompoundOrgan / stageInteractorInteractor roleSecond interactorSecond interactor roleComparatorSettingValue
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“infestation of cultivated sunflower plants, Helianthus annuus LeConte (Asterales: Asteraceae) by Dectes texanus LeConte”
e2“Yield of confection hybrids was improved by a systemic fungicide (thiophanate methyl) in 2005, but insecticides did not improve yield in either year”
Title
Impact of the Stem Borer,Dectes texanus, on Yield of the Cultivated Sunflower,Helianthus annuus.
J.P. Michaud; Angela K. Grant; J.L. Jyoti Journal of Insect Science 2007. doi:10.1673/031.007.2101
Other claims from this paper (11)
- Intervention effect Insecticide treatments improved oilseed sunflower yield in 2004.
- Intervention effect Insecticide treatments did not improve oilseed sunflower yield in 2005.
- Intervention effect A systemic fungicide (thiophanate methyl) improved confection sunflower yield in 2005.
- Intervention effect Both insecticide treatments gave good control of the stalk-boring insects Cylindrocopturus adspersus and Mordellistena sp.
- Intervention effect Neither insecticide treatment gave better than 50% control of Dectes texanus.
- Intervention effect Presence of Dectes texanus larvae did not reduce total seed weight, seed size or oil content of sunflower.
- Observation Mature Dectes texanus larvae girdle sunflower stalks at the base before overwintering.
- Association Girdling by Dectes texanus larvae reduced stalk breakage force by 34-40%.
- Mechanism Girdling by Dectes texanus larvae causes sunflower yield losses through lodging.
- Observation Cultivars and treatments differed in the proportions of Dectes texanus larvae that had girdled their plants at harvest in 2005.
- Recommendation Research on reducing Dectes texanus losses in sunflower should focus on delaying stalk desiccation and deterioration.