Abstract
Apterous Chaetosiphon Fragaefolii (Cockerell) reared on excised discs from mature leaves of Fragaria vesca (L.) were larger and produced more alate offspring than aphids reared on intact leaves. Intact leaves contained 3.8 nig soluble N/g, compared with five-day-old excised tissue which contained 6.0 mg soluble N/g dried tissue. Aphids reared on discs floated on N6Benzyladenine were smaller and produced fewer alate offspring than those reared on discs floated on water. Discs receiving 10 ppm of the cytokinin contained 2.7 mg soluble N/g after five days. Forty ppm of N6B added to the artificial diet of Myzus persicae (Sulzer) had no effect on growth or uptake. Results support hypothesis that excision enhances senescence. The associated increase in soluble N suggests quantitative and/or qualitative improvement in phloem sap which favors aphid growth. Cytokinin (N6B) inhibited senescence and opposite effect occurred. Discs treated with N6B produced deterrent effect on large teneral adults but not on smaller adults of random age.
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