All entries for Saturday 04 July 2015

Updated aphid bulletins

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:

The large migration of the peach–potato aphid (Myzus persicae) in England has continued this week. It is strongly suspected that they are moving away from oilseed rape crops and tests show they are carrying high levels of Turnip Yellows Virus. This week’s big mover is the black bean aphid (Aphis fabae) looking for younger, fresher plant material to feed on. Some suction trap catches this week have notably high numbers of parasitoids, and field reports indicate numbers of aphid predators and parasites are rapidly increasing.

• Numbers of the peach–potato aphid (Myzus persicae) are high through much of England, with highest numbers in central and eastern England. Field reports received of high numbers in some ware potatoes triggering treatment, and extra vigilance is needed in seed crops next to maturing oilseed rape.
• The potato aphid (Macrosiphum euphorbiae) was caught at eleven sites this week, with small hotspots at Hereford (34), Wellesbourne (25) and Preston (20).
• The willow ̶carrot aphid (Cavariella aegopodii) was caught in all our traps this week. This year’s very big migration is finally starting to decline. This week numbers were highest at Kirton (769) and Broom’s Barn (350).
• The mealy cabbage aphid (Brevicoryne brassicae) was caught at ten sites this week, with a big hotspot at Wellesbourne (945), and smaller hotspots at Kirton (384) and Hereford (230). The pea aphid (Acyrthosiphon pisum) was caught at ten sites this week, with a hotspot at Kirton (35), and with numbers increasing at seven sites.
• Numbers of the black bean aphid (Aphis fabae) markedly increased across central and southern England, with hotspots at Writtle (686), Broom’s Barn (361) and Wellesbourne (255).

ahdb-aphid-news-12-.pdf bulletin_12_2015.pdf

Rosemary Collier : 04 Jul 2015 12:23 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Yesterday we found:

• 12 male and 14 female cabbage root flies (3 water traps)
• 24 bean seed flies (3 traps)
• 8 carrot flies (3 traps) in our new carrots
• 6 cabbage root fly eggs (15 cauliflower plants)
• 12 turnip moths (2 traps)
• 1 silver Y moth (2 traps)
• 2 diamond-back moths (2 traps)
• 127 brassica flea beetles (3 traps)
• 21 pollen beetles (3 traps)

Rosemary Collier : 04 Jul 2015 12:13 |  Comments (0) |  Close comments |  Report a problem