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Plant resistance, plant traits, and host plant choice of the leaf‐folding sawfly on the arroyo willow
Author(s) -
FRITZ ROBERT S.,
NOBEL JENNIFER
Publication year - 1989
Publication title -
ecological entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.865
H-Index - 81
eISSN - 1365-2311
pISSN - 0307-6946
DOI - 10.1111/j.1365-2311.1989.tb00941.x
Subject(s) - biology , sawfly , willow , shoot , tenthredinidae , cutting , salicaceae , botany , host (biology) , leaf size , horticulture , woody plant , hymenoptera , ecology
. 1. The hypotheses that genetic variation in host plant resistance of the arroyo willow affected leaf folder ( Phyllocolpa sp.) (Hymenoptera: Tenthredinidae) density and that genetic variation in shoot length and leaf length was correlated with resistance were tested. 2. Willows grown in pots and exposed to ovipojsition by the leaf folding sawfly in cages had significantly different densities among clones, indicating variation in resistance caused by genetic differences among conspecific host plants. 3. There was a general correspondence between leaf folder density on potted cuttings and on the plants in the field that were the sources of cuttings. 4. In behavioural choice experiments, susceptible clones (with highest leaf fold densities) had the highest oviposition activity of female leaf folders compared to clones that were resistant to the leaf folder. 5. Clones differed significantly in shoot length and leaf length among clones grown in pots, among clones in the field, and between shoots with galls and shoots without galls on clones in the field. 6. Leaf folder density was significantly positively correlated with mean shoot length on field clones in 1985 and 1986, but was not correlated with leaf length, although leaf length and shoot length were correlated. 7. Leaf length variation among willow clones accounted for a significant portion of the variation in resistance of potted willows, but shoot length was unimportant.