Updated aphid bulletins – captures 6–12 July

The latest editions of the Rothamsted Suction Trap Bulletin and AHDB Aphid News are attached. The information of interest to vegetable and salad growers is as follows:

• Numbers of the peach–potato aphid (Myzus persicae) have fallen significantly this week, highest numbers were at Kirton (111).

• The potato aphid (Macrosiphum euphorbiae) was caught in low numbers at eight sites.

• The numbers of the willow ̶ carrot aphid (Cavariella aegopodii) are now low everywhere.

• The mealy cabbage aphid (Brevicoryne brassicae) was caught at eleven sites this week, with numbers highest in central and eastern England.

• The pea aphid (Acyrthosiphon pisum) was caught at eleven sites this week, with numbers decreasing and below the 10yr averages. Field reports of pea aphid are common especially in eastern England.

• Numbers of the black bean aphid (Aphis fabae) remain high, but are slowly decreasing everywhere except Kirton. Field reports indicate that despite multiple spray applications, aphids are very quickly re-colonising crops.

• The currant-lettuce aphid (Nasonovia ribisnigri) was caught in the suction-traps at Dundee, Preston and Hereford.

• Numbers of aphid predators (hoverflies, ladybirds and lacewings) are increasing in our trap samples and field reports suggest are now much more common in the field.

ahdb-aphid-news-14-.pdf bulletin_14_2015.pdf

Rosemary Collier : 17 Jul 2015 16:57 |  Comments (0) |  Report a problem