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Effect of host plant ozone stress on Colorado potato beetles

Effect of host plant ozone stress on Colorado potato beetles

Environmental entomology 30(5): 824-831

ISSN/ISBN: 0046-225X

DOI: 10.1603/0046-225x-30.5.824

Effects of ozone (O3) stress of potato, Solanum tuberosum L., on fecundity, larval growth and survival of Colorado potato beetles, Leptinotarsa decemlineata (Say), were measured in greenhouse and field experiments. Chronic O3 exposure caused moderate to severe foliar injury on an O3-sensitive cultivar ('Red Norland') but caused only minor injury an O3-resistant cultivar ('Superior'). Foliar injury caused by O3 was greater on old than on young leaves but feeding by adult beetles was greater on young leaves in all experiments. Foliar analyses of the five uppermost leaves (nodes 1-5) showed higher carbon (C) and higher nitrogen (N) concentration in Superior than in Norland. There were no significant O3 effects on C or N and no cultivar X O3 interactions. Egg production by newly emerged adult beetles feeding on plants exposed to high O3 levels was not significantly different from egg production on plants exposed to low O3 levels, regardless of cultivar O3 sensitivity. Feeding and energy conversion efficiency of neonates and survival of larvae to the adult stage were not significantly affected by the O3 treatment. Although present levels of tropospheric O3 are high enough to significantly affect yield of sensitive potato cultivars, our results indicate no significant effect of ambient O3 concentrations on Colorado potato beetle populations.

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Accession: 003729573

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