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R424 Matching Blight Fungicides and Cultivar Resistance (LINK)

Publication Date: 
23 August 2011
Author/Contact :
Ruairidh Bain

Contractor :

Full Research Project Title: Sustainable and effective control of potato blight: matching fungicide inputs to cultivar resistance level
Duration: April 2009 - September 2012

Aim: To provide the potato industry with the robust information required to allow substantial use of integrated control without compromising the control of blight.

Industry Challenge

Pesticides usage survey data shows that potato crops in the UK receive, on average, ten blight sprays at close to the full label recommended dose. Control of potato late blight is going to become more difficult in the UK in future because of the impact of climate change and evolution in the P. infestans population towards increased virulence, aggressiveness and fungicide insensitivity. Continuing to rely so heavily on repeated applications of fungicide for control will not be effective and greater use will need to be made of cultivar resistance in an integrated control strategy, which does not compromise control and offers economic benefits. The work of this project will be equally relevant to ware and seed crop, for early and main crop production and for processing and non-processing crops. The outcomes from the work would help the UK potato industry meet the requirements of the EU Thematic Strategy on the sustainable use of pesticides.


ADAS, Branston, Bayer Crop Sciences, Greenvale AP, Higgins Agriculture, SAC, JHI, Syngenta Crop Protection.


This project further develops the work of project R293 which examined the effect of fungicide inputs on cultivars with different resistance ratings. 

a) Model the interaction of host resistance with fungicide product, dose and spray interval.

b) Evaluate the performance of different levels of integrated blight control against a routine standard during growing seasons with different levels and patterns of risk.

c) Provide robust information on the resistance of important varieties to the contemporary UK population of P. infestans.

d) Determine the impact of cultivar resistance to foliar blight on the persistence of protection afforded by doses of different products.

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