Factors determining the distribution of sycamore aphids on sycamore leaves during summer |
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Authors: | A F G DIXON |
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Institution: | School of Biological Sciences, University of East Anglia, Norwich |
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Abstract: | - 1 In summer the sycamore aphid's responses to gravity, light direction and intensity and unidentified features of a leaf's surface result in the aphid settling and feeding on the undersurface of leaves.
- 2 At this time the petioles are a poor source of food and are not colonized.
- 3 Removal of leaf laminae results in premature abscission of the petioles. Prior to abscission the petioles become senescent and a richer food source than the laminae of mature leaves, and are colonized by aphids.
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