Selection ofAzolla forms resistant to the water lily aphid,Rhopalosiphum nymphaeae Life history of Rhopalosiphum nymphaeae |
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Authors: | Th Hance D Nibelle Ph Lebrun G Van Impe and C Van Hove |
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Institution: | (1) Department of Plant and Forest Protection, Swedish University of Agricultural Sciences, P.O. Box 7044, S-75007 Uppsala, Sweden |
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Abstract: | Genotypic and environmentally determined differences inSalix viminalis L. suitability forDasineura marginemtorquens (Bremi) (Diptera: Cecidomyiidae) growth and survival were investigated in laboratory and field experiments. Earlier studies
have documented high neonate larval mortality on certainS. viminalis genotypes. Here we present results from laboratory experiments which show no difference in larval establishment behaviour
on resistant and susceptible willow genotypes. These data indicate that larvae are not able to detect the plant characteristic
responsible for resistance. In a field study insect performance was measured on willow shoots of dissmilar size. Adult body
size was positively correlated to willow shoot length. In turn, body size was positively correlated to potential fecundity.
These results are discussed in relation to observed high densities ofD. marginemtorquens in vigorously growing willows cultivated for biomass production. |
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Keywords: | resistance Dasineura marginemtorquens gall midge willow gall initiation shoot length fecundity |
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