Document Detail

Effect of rice bug Leptocorisa oratorius (Hemiptera: Alydidae) on rice yield, grain quality, and seed viability.
MedLine Citation:
PMID:  15666746     Owner:  NLM     Status:  MEDLINE    
The effect of Leptocorisa oratorius (F.) on the yield, grain quality, and seed viability of four rice, Oryza sativa L., lines was studied. Three of the lines, C2, IR64, and PSBRc20, are grown in the Philippines. The fourth, IR72164-201-1 is an unreleased experimental line of an O. sativa japonica x O. sativa indica cross. Each line was exposed to four infestation densities for 21 d. L. oratorius feeding produced unfilled and partially filled grains, resulting in a negative correlation of yield to rice bug density. When filled grains were sown, germination rates were negatively correlated with rice bug densities. The percentage of discolored grains was positively correlated with L. oratorius density on all rice lines. At the same infestation rates, PSBRc20 and IR64 had higher yields, less damaged grain, and higher germination rates than IR72164-201-1 and C2, suggesting host plant tolerance to rice bug feeding. The economic injury levels (EILs) currently used for rice bug management are based solely on yield loss estimates. The results of this study suggest that EIL for rice bugs should be revised to take into account reductions in grain quality and seed germination rates in addition to yield loss.
Gary C Jahn; Isaias Domingo; M Liberty P Almazan; Jocelyn Pacia
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of economic entomology     Volume:  97     ISSN:  0022-0493     ISO Abbreviation:  J. Econ. Entomol.     Publication Date:  2004 Dec 
Date Detail:
Created Date:  2005-01-25     Completed Date:  2005-02-25     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  2985127R     Medline TA:  J Econ Entomol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1923-7     Citation Subset:  IM    
Entomology and Plant Pathology Division, International Rice Research Institute, DAPO Box 7777, Metro Manila, Philippines.
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MeSH Terms
Agriculture / economics
Hemiptera / physiology*
Oryza sativa / physiology*
Plant Diseases / economics
Quality Control
Seeds / physiology*

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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