48 www.agrii.co.uk Can’t see what you’re looking for? For more information, contact Agrii T: 0845 607 3322 Thrips There are many species of thrips found in Britain, several of which may occasionally attack crops. The most common species found on protected crops are Thrips tabaci (onion thrips) and more recently Frank- liniella occidentalis (western flower thrips or W.F.T.). Thrips feed on many types of crops causing damage to leaves and scarring to both flowers and fruit. Damage to leaves can be recognised by the appearance of white flecks with black spots (droppings) in them. If the damage is severe, leaves become totally “silvered” and many young and adult thrips can be seen underneath the leaf and in the flowers. Thrips can also transmit viruses such as tomato spotted wilt virus, which is damaging to a range of crops. Some of the biological agents we can supply to control Thrips include: Amblyseius cucumeris Orius laevigatus Hypoaspis miles Steinernema feltiae Vine weevil The Black Vine Weevil (Otiorhynchus sulcatus) is a pest of many crops, and is a major pest where polythene or containers are used. Adults feed at night, and are therefore rarely seen, they leave rounded notches at the edges of leaves and flowers. It is the damage done to the plant roots by larval feeding which causes crop losses. Attacked plants often show few symptoms above ground until they are severely weakened and dying. Some of the Biological agents we can supply to control Vine Weevil include: Steinernema kraussei Heterorhabditis megidis For specific advice and guidance on these and the other biological control options, contact your local Agrii agronomist Biological Control