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Treating hop plants with (Z)-jasmone increases colonization by Phorodon humuli (Hemiptera: Aphididae) spring migrants

Published online by Cambridge University Press:  24 May 2007

T.W. Pope*
Affiliation:
East Malling Research, New Road, East Malling, Kent, ME19 6BJ, UK Imperial College London, Faculty of Natural Sciences, Division of Biology, Silwood Park Campus, Ascot, Berkshire, SL5 7PY, UK
C.A.M. Campbell
Affiliation:
East Malling Research, New Road, East Malling, Kent, ME19 6BJ, UK
J. Hardie
Affiliation:
Imperial College London, Faculty of Natural Sciences, Division of Biology, Silwood Park Campus, Ascot, Berkshire, SL5 7PY, UK
L.J. Wadhams
Affiliation:
Rothamsted Research, Harpenden, Hertfordshire, AL5 2JQ, UK
*
*Address for correspondence: Imperial College London, Faculty of Natural Sciences, Division of Biology, Wye Campus, Ashford, Kent, TN25 5AH, UK Fax: +44 (0)20 7594 2669 E-mail: [email protected]

Abstract

Hop plants were sprayed with (Z)-jasmone, at a rate of 50 g ha−1, during the spring migration of the damson–hop aphid Phorodon humuli (Schrank) in 2002 and 2003. Numbers of P. humuli spring migrants colonizing hop plants, Humulus lupulus L., 2–6 and 7–11 days after applying this treatment were assessed in both years. During the first five-day period, significantly more spring migrants were found on hop plants treated with (Z)-jasmone, in comparison with control plants, in 2002. By contrast, no significant difference was evident in the second five-day period. Although the migration in 2003 was much lighter than in 2002, greater numbers of migrants were again removed from treated plants. Indeed, more spring migrants were removed from plants sprayed with (Z)-jasmone in this year during both five-day periods (11 and 44%, respectively) compared with the 23% greater numbers removed in the first five-day period in 2002. Therefore, unlike some other species of aphid, where numbers were consistently lower on plots sprayed with (Z)-jasmone, spraying the secondary host of P. humuli with this compound appears to increase colonization by spring migrants.

Type
Short Communication
Copyright
Copyright © Cambridge University Press 2007

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