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.
Lettuce & Celery Crop Walkers Guide is available from Kirsty Nichols. Email firstname.lastname@example.org.
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.