All entries for Saturday 20 July 2013

Rothamsted suction trap captures up to 14th July

Writing about web page http://www.rothamsted.ac.uk/insect-survey/Bulletins/2013WebBulletin12.pdf

Information on suction trap captures up to 14th July is now available. More detailed information about the pest aphids of vegetables is here.

The unusually late flight of willow–carrot aphid continues with numbers in-creasing at four suction trap sites. Accumulated numbers for 2013 at Here-ford and Starcross are above the ten year means. However in the field willow–carrot aphid numbers have apparently decreased since last week. 

Peach–potato aphid suction trap numbers are increasing, with a hotspot at Writtle. Accumulated numbers of both peach–potato aphid and potato aphid are low for the time of year. There are field reports of peach–potato aphid numbers building in potato crops in the Midlands with winged individuals starting to move off onto brassica crops as the plants wilt in the heat.

Yellow water trays placed by Broom’s Barn at twenty eight sites in sugar beet areas caught 18 peach–potato aphids and no potato aphids during the period 10/7–16/7.

Pea aphid and cabbage aphid numbers are building in southern England.

Black bean aphids were caught throughout the Country, with numbers high-est in the south west.

Currant–lettuce aphids were caught at five sites in low numbers.

Rosemary Collier : 20 Jul 2013 12:45 |  Comments (0) |  Close comments |  Report a problem