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Combating insecticide resistance in the peach potato aphid - LK0903

The research was aimed at investigating the biology and control of M.persicar carrying various combinations of all known resistance mechanisms both in the presence and absence of insecticides. The primary aim was to assess the implications of these mechanisms and generate information that could be rapidly used to influence present and future crop protection practices, and to provide guidance for delaying the increase of insecticide resistance.

Specifically, the project not only aimed to extend the scope and precision of aphid monitoring programmes but also to investigate the effectiveness, in the laboratory and the field, of established and novel aphicides. Furthermore, it also aimed to explore possible fitness drawbacks and associated with these mechanisms that cold contribute to a natural reduction in resistance frequencies. Emphasis was placed on managing M.persicate on potatoes and vegetable brassicas; but many results are relevant to other crops attached by this highly polyphagous pest.

The Main objectives of research were:

· Investigate the incidence of the kdr mechanism in the UK and
use the information to influence current decisions on the use of
pyrethroids to circumvent the MACE mechanism.
· Investigate imidacloprid resistance in the UK to anticipate its
likely impact on the performance of the neonicotinoid class of
· Establish the interaction of the MACE, kdr-and esterase-based
mechanisms, and how this will affect insecticide choice.
· Establish potential fitness drawbacks suffered by kdr forms in the
absence of insecticides under sub-optimal conditions associated with
the winter climate, either in their own right or through association
with high esterase-based resistance.
· Assess forms of resistance of pirimicarb, trizamate and pyrethroids
in Aphis gossypii and Aphis nasturtii which can both be important
pests on potatoes and horticultural crops.

Carry out field trials to assess options for aphid control by insecticides
Project Documents
• Abstract : LK0903 Combating Insecticide Resistance in Peach-Potato Aphids in the UK Abstract   (10k)
• Information Leaflet : Combating Insecticide Resistance in Peach-Potato Aphids in the UK (LK0903)  Leaflet   (212k)
Time-Scale and Cost
From: 1998

To: 2001

Cost: £258,272
Contractor / Funded Organisations
Rothamsted Research (BBSRC)
LINK Programme              
Pest and Weed Control              
Sustainable Farming and Food              
Sustainable Production              
Fields of Study
Pesticide Safety