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Cabbage stem flea beetle snapshot assessment - September 2014

Project Report No. 546 - Extension

Cabbage stem flea beetle snapshot assessment - incidence and severity at end September 2014

by

Sarah Wynn, Steve Ellis and Lottie Alves

ADAS UK Ltd

 

Background

On 1 December 2013, a restriction on the use of the neonicotinoids, clothianidin, imidacloprid and thiamethoxam, was enforced by the European Commission. Autumn 2014 is the first season since the restriction was enforced in which neonicotinoid seed treatments have not been available for protecting winter oilseed rape crops during establishment.

Neonicotinoid seed treatments were previously used to reduce the damage to seedlings caused by early attacks by cabbage stem flea beetle (CSFB) thereby improving crop establishment. This report provides a snapshot assessment across England and Scotland, at county level, of the level of CSFB damage in winter oilseed rape and the requirement for insecticide treatment at the end of September. It also provides an estimation of the number of pyrethroid treatments applied from the crop emergence period until the end of September.

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