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Lookup NU author(s): Dr Gordon Port,
Emeritus Professor Alan Davison
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A large proportion of leaf fluoride consists of surface deposits and a sucking herbivore would be expected to take in a smaller load of fluoride in its food than a chewing herbivore. In these experiments, fluoride was applied aerially, through the leaves, and systemically, via the roots, to compare uptake by aphids and effects on their fecundity. Fluoride applied via roots was taken up by both the plants and the aphids, but at high treatment rates the aphids had much lower concentrations than the foliage. When the plants and aphids were fumigated with HF the aphids had much greater loads than the plant shoots, which was due to deposition of F on the insect surfaces. There were no effects of the treatments on aphid reproduction or development time. The aphids obtained some fluoride through their diet which suggests that fluoride is present in the phloem sap, previously thought to be of minor importance.
Author(s): Davies MT, Port GR, Davison AW
Publication type: Article
Publication status: Published
Journal: Environmental Pollution
Print publication date: 08/09/1998
ISSN (print): 0269-7491
ISSN (electronic): 1873-6424
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