The products, both esfenvalerates, are now recommended for the control of aphids in potatoes; for the control of pea and bean thrips in vining peas; and for the control of caterpillars and midges in cabbage, Chinese cabbage, kale, Brussels Sprouts, cauliflower, broccoli/calabrese and Kohlrabi.
Dr David Stormonth, technical manager for Interfarm UK, which markets the product on behalf of Sumitomo Chemicals, said: "Now more growers will be able to benefit from their excellent persistence and strong repellancy on aphids and other pests."
Koppert's insecticide Savona, which is made from the potassium salts of fatty acids, has received a SOLA (Specific Off-label Approval) for a range of horticultural crops including garlic, salad onions, cress, spinach and winter squash. For a full list of crops, visit the Chemicals Regulation Directorate (CRD) website, www.pesticides.gov.uk.
Syngenta's in-furrow insecticide treatment Actara has gained approval in time for this season's potato seed crop planting in Scotland and the north of England. The product could give more than five weeks of post-emergence aphid control.
Syngenta warns that seed potato plants can be rapidly infected with non-persistent viruses, such as PVA and PVY, by aphids migrating through the crop. Cereal aphids are known to be important vectors for these viruses, though control with Actara can prevent them moving on to infect other plants.
An Actara trial organised by Scottish Agronomy in 2009 reported high levels of infection in untreated plots, but more than 40 per cent less in plots treated with Actara at planting and supported with a foliar treatment from six weeks after first emergence.