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Influence of ozone on pea aphid resistance in selected alfalfa strains

Journal Article · · J. Econ. Entomol.; (United States)
DOI:https://doi.org/10.1093/jee/71.2.283· OSTI ID:6682991
; ;

Ozone-treated plants of 5 strains of alfalfa, Medicago sativa L., were compared with untreated plants for resistance to Acyrthosiphon pisum (Harris). Treated plants were exposed to 20 pphm ozone for 4 h at 26/sup 0/C, 92% RH, and an illumination of 21.5 KLx (2000 ft-c). After 48 h, they were scored on a numerical scale for ozone injury. Ozone-treated and untreated plants were then evaluated for pea aphid resistance by caging 4 adult females on each plant for 7 days and then recording adult survival, living nymphs, and dead nymphs. Higher levels of ozone resistance were confirmed in alfalfa entries that had previous cycles of selection in the greenhouse for air pollutant resistance. The variety ''Team'' and the experimental population MSA-CW3An3, 2 of the 3 entries with higher levels of ozone resistance, also displayed higher levels of pea aphid resistance. MSB-CE5An3 also was resistant to ozone but not to the pea aphid. The varieties ''Mesa-Sirsa'' and ''Williamsburg'' were susceptible to both ozone and the pea aphid. Ozone injury had little or no effect on alfalfa resistance to pea aphids as expressed by numbers of surviving adults, living nymphs, and dead nymphs.

Research Organization:
Agriculture Research Service, Beltsville, MD
OSTI ID:
6682991
Journal Information:
J. Econ. Entomol.; (United States), Journal Name: J. Econ. Entomol.; (United States) Vol. 71:2; ISSN JEENA
Country of Publication:
United States
Language:
English

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Related Subjects

560304* -- Chemicals Metabolism & Toxicology-- Invertebrates-- (-1987)
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
AIR POLLUTION
ALFALFA
ANIMALS
APHIDS
ARTHROPODS
BIOLOGICAL ADAPTATION
BIOLOGICAL EFFECTS
BIOMASS
ENERGY SOURCES
HEMIPTERA
INSECTS
INVERTEBRATES
LEGUMINOSAE
OZONE
PLANTS
POLLUTION
POPULATIONS
RENEWABLE ENERGY SOURCES