Effects of Plant Spacing and Interplanting with Oilseed Rape on Colonisation of Dwarf Hops by the Damson-hop Aphid, Phorodon Humuli

Campbell, C.A.M. and Ridout, Martin S. (2001) Effects of Plant Spacing and Interplanting with Oilseed Rape on Colonisation of Dwarf Hops by the Damson-hop Aphid, Phorodon Humuli. Entomologia Experimentalis et Applicata, 99 (2). pp. 211-216. ISSN 0013-8703. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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The pattern of colonisation of dwarf hops (Humulus lupulus) by damson-hop aphid (Phorodon humuli (Schrank)) migrating from Prunus spp. was investigated at six plant spacings and where some of the hops were replaced by oilseed rape (Brassica napus L.), a non-host of the aphid. The number of migrant aphids that accumulated on hop stems (bines) increased with increasing bine size and density. The numbers of aphids that colonised hops interplanted with oilseed rape reflected the density of the hop plants only and not the overall plant density. As the physical size of the wind shadow within which flying aphids can manoeuvre and land was unimportant unless provided by a host plant, the finding supports the theory that flying aphids respond to olfactory stimuli associated with their hosts. Variation in bine height (as a measure of plant size) explained 29–93% of the variance in aphid counts during the 3 years' study and bine density 1–14%. Standardising the data as the numbers of aphids per metre of bine and taking a square-root transformation of these standardised counts improved the precision of the analyses and, by stabilising variances, facilitated comparisons between years as growth became more vigorous as the plants matured. Each year, the rate of increase in numbers of aphids settling on plots of hops declined curvilinearly with increasing bine density. Maximum colonisation by P. humuli occurred at a bine density of five per metre row, a density similar to that used commercially by growers of dwarf hops.

Item Type: Article
Subjects: Q Science > QH Natural history > QH301 Biology
Divisions: Faculties > Science Technology and Medical Studies > School of Mathematics Statistics and Actuarial Science > Statistics
Depositing User: Martin S Ridout
Date Deposited: 06 Nov 2008 18:57
Last Modified: 04 Jun 2014 11:09
Resource URI: https://kar.kent.ac.uk/id/eprint/9374 (The current URI for this page, for reference purposes)
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