Abstract
A postal questionnaire survey of recipients of the Rothamsted Insect Survey Aphid Commentary showed that the interpretations of aphid-monitoring data were used widely to assist in aphid control on arable crops, especially cereals, but were used less for control on apples and hops. Potentially, the information in one form or another could reach all farmers, and in reality the actual number reached is thought to be large. Ministry of Agriculture advisers make most use of available aphid forecasts and economic thresholds and on all crops, except seed potatoes, recommend that the decision to control aphids should be based on population levels on crops. The majority of consultants and commercial advisers give advice similat to that of Ministry advisers, but fever make use of available forecasts and economic thresholds and a larger proportion advise routine aphid control. The possible effects of these differences between advisers on overall pesticide usage are discussed.
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