Document Detail

Tillage impacts cereal-aphid (Homoptera: Aphididae) infestations in spring small grains.
MedLine Citation:
PMID:  14977117     Owner:  NLM     Status:  MEDLINE    
We compared infestation levels of cereal aphids (Homoptera: Aphididae) in spring-seeded wheat and barley grown with and without preplant tillage for 8 site yr in eastern South Dakota. Crop residue covered approximately 25% of the soil surface with preplant tillage, whereas without preplant tillage 50% or more of surface residue was conserved. Rhopalosiphum padi (L.) comprised nearly 90% of all cereal aphids sampled, and R. maidis (Fitch), Schizaphis graminum (Rondani), and Sitobion avenae (F.) collectively comprised the remainder. R. padi routinely infested lower parts of tillers and were generally concealed by surface residue in plots with no preplant tillage. Across 7 site yr, R. padi were more abundant in plots with no preplant tillage than with preplant tillage (272.6 +/- 54.4 versus 170.1 +/- 37.2 aphid days per 25 tillers). However, in comparisons at individual site years, R. padi were greater in no-preplant tillage plots only once. For all cereal-aphid species combined, infestations were greater in plots with no preplant tillage for 1 of 8 site yr, but did not differ with tillage when compared across all site years. Cereal aphids were never more abundant in plots with preplant tillage. Our results show that conservation tillage leads to greater infestations of R. padi in spring small grains, as increased surface residue provides a favorable microhabitat for this aphid.
L S Hesler; R K Berg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of economic entomology     Volume:  96     ISSN:  0022-0493     ISO Abbreviation:  J. Econ. Entomol.     Publication Date:  2003 Dec 
Date Detail:
Created Date:  2004-02-23     Completed Date:  2004-03-17     Revised Date:  2006-04-17    
Medline Journal Info:
Nlm Unique ID:  2985127R     Medline TA:  J Econ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1792-7     Citation Subset:  IM    
Northern Grain Insects Research Laboratory, United States Department of Agriculture-Agricultural Research Service, 2923 Medary Avenue, Brookings, SD 57006, USA.
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MeSH Terms
Agriculture / methods*
Aphids / physiology*
Hordeum / growth & development
Population Density
Triticum / growth & development
Reg. No./Substance:

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