Elm leaf beetle performance on ozone-fumigated elm
1992
Barger, Jack H. | Hall, Richard W. | Townsend, Alden M.
S2Leaves harvested in 1986 from clonally propagated elm hybrids ('Pioneer', 'Homestead', '970') previously fumigated in open-top chambers with ozone at 15 parts per hundred million (pphm) or with charcoal-filtered air (CFA) were evaluated for water and nitrogen content or were fed to adult elm leaf beetles (ELB), Xanthogaleruca = (Pyrrhalta) luteola (Muller), to determine host suitability for beetle fecundity and survivorship. For all three hybrids, EL9 females fed ozone-fumigated leaves laid significantly fewer eggs than females fed CFA-fumigated leaves. Fecundity of females fed '970' leaves was higher than for females fed 'Pioneer' or 'Homestead' foliage. Fumigation treatment had no significant effect on leaf nitrogen or water content. There was a significant positive linear relationship between leaf nitrogen content and beetle fecundity for all hybrids combined. In 1988, hybrid '970' was fumigated with CFA, 15, 30, or 45 pphm ozone to determine concentration effects on EL9 fecundity, leaf consumption, and survivorship. Significantly fewer eggs were laid only at the higher concentration of ozone. Mean leaf area consumed by beetles did not vary among fumigation treatments. For both years, beetle survivorship was unaffected by hybrid or ozone concentration.S3.
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