Skip to main content

Vertical dispersal of the two-spotted spider mite Tetranychus urticae, and the predatory mite Phytoseiulus persimilis on dwarf hops

Buy Article:

$51.00 plus tax (Refund Policy)



1 The pattern of dispersion within plants of the two-spotted spider mite, Tetranychus urticae, and its predator, the phytoseiid Phytoseiulus persimilis, was studied on the dwarf hop variety First Gold from May to September in 1997 and 1998.

2 Spider mite populations developed on the lower leaves initially but, by late July, as the numbers of mites increased, most were found towards the top of plants. From early August, the numbers of spider mites decreased most rapidly on the upper parts of plants.

3 Where P. persimilis was released, the predator maintained the numbers of T. urticae below those found on non-release plots throughout the season.

4 By early August, the predator’s pattern of dispersion was similar to that of the pest.

5 Predators spread to non-release plots by 20 June in 1997 and 24 July in 1998 and eventually became more numerous than on the plots where they had been released.

Keywords: Biocontrol; Phytoseiulus persimilis; dispersion; hop; spider mite

Document Type: Research Article


Affiliations: Horticulture Research International, East Malling, West Malling, Kent. ME19 6BJ, U.K.

Publication date: May 1, 1999


Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
ingentaconnect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more
Real Time Web Analytics