Science into practice predator shows appetite for raspberry mite

The insecticide Dynamec (abamectin) and the predatory mite Amblyseius andersoni both showed potential as control measures for raspberry leaf and bud mite during trials in HDC project SF 81.

Dynamec performed well in trials on tunnel-grown crops and is currently only approved for use under protection. A. andersoni performed well in laboratory tests and in small-scale trials. This biological approach could be tested by growers as a control option.

In trials on two commercial tunnel-grown crops, the researchers resorted to a Dynamec treatment because there were large numbers of leaf and bud mite in the crop and more in the predator-treated tunnels than in the tunnels subjected to the grower's own standard practice.

However, in smaller-scale trials in a mesh-covered tunnel, plants treated with predators had far fewer leaf and bud mites, suggesting that in certain conditions this predator is successful at controlling the pest.

With such a limited choice of control measures, growers are recommended to consider raspberry varietal susceptibility when planting in areas prone to leaf and bud mites. The final report can be accessed online via the HDC website.

New publications

Lettuce & Celery Crop Walkers Guide is available from Kirsty Nichols. Email kirsty.nichols@hdc.ahdb.org.uk.

Herb Best Practice Guide is now available online at www.hdc.org.uk.

Dates for your diary

Herbaceous Perennials Technical Discussion Group, London, 22 February. This meeting will showcase crop protection projects relevant to the sector.

Horticultural Development Company

For details on all HDC activities, visit www.hdc.org.uk.


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