All entries for July 2015

Aphid and Turnip yellows virus News

Brassica virus and peach potato aphid update from Wellesbourne, Warwickshire:

• 2-6/07/2015, Lots of M. persicae were caught (12 yellow water traps), 81% of those tested were carrying TuYV.
• 6-9/07/2015, Low numbers of M. persicae were caught (12 yellow water traps), 69% of these were carrying TuYV.
• 29-06/05-07/2015, From the Rothamsted Insect Survey suction trap catch, 42 M. persicae were identified, 79% of those tested were carrying TuYV.

Brassica virus and peach potato aphid update from Kirton, Lincolnshire:

• 2-6/07/2015, Lots of M. persicae were caught (12 yellow water traps), 81% of those tested were carrying TuYV.
• 6-9/07/2015, Intermediate numbers of M. persicae were caught (12 yellow water traps), 86% of these were carrying TuYV.
• 29-06/05-07/2015, From the Rothamsted Insect Survey suction trap catch, 110 M. persicae were identified, 93% of those tested were carrying TuYV.

Turnip Yellows Virus (TuYV), formerly known as Beet western yellows virus, is a very important pathogen of vegetable brassicas and oilseed rape. It is spread by the peach potato aphid (Myzus persicae). This data is collected with funding from the BBSRC Horticulture And Potato Initiative (HAPI).

Press release on the new round of HAPI projects involving the University of Warwick

Diana Katschnig and Angela Hambidge, Plant-Virus Interactions Group, University of Warwick

Diana Katschnig : 15 Jul 2015 08:20 |  Tags: Aphid Tuyv |  Comments (0) |  Close comments |  Report a problem

Wellesbourne pest update

Yesterday we found:

• 10 male and 54 female cabbage root flies (3 water traps)
• 14 bean seed flies (3 traps)
• 16 carrot flies (3 traps) in our new carrots
• 94 cabbage root fly eggs (15 cauliflower plants)
• 1 turnip moth (2 traps)
• 6 diamond-back moth (2 traps)
• 58 brassica flea beetles (3 traps)
• 34 pollen beetles (3 traps)
• 3 cabbage stem weevils (3 traps)

Rosemary Collier : 14 Jul 2015 07:40 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Today we found:

• 20 male and 43 female cabbage root flies (3 water traps)
• 29 bean seed flies (3 traps)
• 6 carrot flies (3 traps) in our new carrots
• 65 cabbage root fly eggs (15 cauliflower plants)
• 4 turnip moths (2 traps)
• 1 diamond-back moth (3 traps)
• 47 brassica flea beetles (3 traps)
• 35 pollen beetles (3 traps)
• 3 cabbage stem weevils (3 traps)

Rosemary Collier : 10 Jul 2015 16:53 |  Comments (0) |  Close comments |  Report a problem

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:

• Numbers of the peach–potato aphid (Myzus persicae) are high through much of England, with highest numbers at Kirton and Starcross, plus a first flush of peach–potato aphids in Scottish suction-traps this week.
• The potato aphid (Macrosiphum euphorbiae) was caught at ten sites this week, with small hotspots at Kirton (34) and Starcross (32).
• The willow ̶ carrot aphid (Cavariella aegopodii) was caught in eleven traps this week, but numbers decreased in 8/11 sites. This week numbers were highest at Kirton (280) and Wellesbourne (201).
• The mealy cabbage aphid (Brevicoryne brassicae) was caught at twelve sites this week, with a big hotspot at Wellesbourne (1843).
• The pea aphid (Acyrthosiphon pisum) was caught at thirteen sites this week, with a hotspot at Starcross (202), and with numbers increasing at 10/13 sites. Field reports of pea aphid are becoming more common especially in eastern England.
• Numbers of the black bean aphid (Aphis fabae) increased across England, with numbers highest in central and eastern England. Field reports indicate that despite multiple spray applications, aphids are very quickly re-colonising crops.

ahdb-aphid-news-13-.pdf bulletin_13_2015.pdf

Rosemary Collier : 10 Jul 2015 16:37 |  Comments (0) |  Close comments |  Report a problem

Aphid and Turnip yellows virus News

Brassica virus and peach potato aphid update from Wellesbourne, Warwickshire:

• 25-29/06/2015, Lots of M. persicae were caught (12 yellow water traps), 93% of those tested were carrying TuYV.
• 29-06/2-07/2015, Lots of M. persicae were caught (12 yellow water traps), 73% of these were carrying TuYV.
• 22-28/06/2015, From the Rothamsted Insect Survey suction trap catch, 82 M. persicae were identified, 64% of those tested were carrying TuYV.

Brassica virus and peach potato aphid update from Kirton, Lincolnshire:

• 25-29/06/2015, Lots of M. persicae were caught (12 yellow water traps), 86% of those tested were carrying TuYV.
• 29-06/2-07/2015, Lots of M. persicae were caught (12 yellow water traps), 89% of these were carrying TuYV.
• 22-28/06/2015, From the Rothamsted Insect Survey suction trap catch, 258 M. persicae were identified, 100% of those tested were carrying TuYV.

Turnip Yellows Virus (TuYV), formerly known as Beet western yellows virus, is a very important pathogen of vegetable brassicas and oilseed rape. It is spread by the peach potato aphid (Myzus persicae). This data is collected with funding from the BBSRC Horticulture And Potato Initiative (HAPI).

Press release on the new round of HAPI projects involving the University of Warwick

Diana Katschnig and Angela Hambidge, Plant-Virus Interactions Group, University of Warwick

Diana Katschnig : 08 Jul 2015 08:23 |  Tags: Aphid Yuyv |  Comments (0) |  Close comments |  Report a problem

FV 416b – cabbage root fly egg counts in Cornwall

The egg counts up to Monday 6th July are as follows - they show the mean numbers of eggs per plant per week found around a sample of 20 plants per location:

Rosemary Collier : 07 Jul 2015 21:53 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Yesterday we found:

• 8 male and 20 female cabbage root flies (3 water traps)
• 14 bean seed flies (3 traps)
• 4 carrot flies (3 traps) in our new carrots
• 46 cabbage root fly eggs (15 cauliflower plants)
• 6 turnip moths (2 traps)
• 3 diamond-back moth (3 traps)
• 1 silver Y moth (3 traps)
• 70 brassica flea beetles (3 traps)
• 24 pollen beetles (3 traps)

Rosemary Collier : 07 Jul 2015 08:09 |  Comments (0) |  Close comments |  Report a problem

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

FV 416b – cabbage root fly egg counts in Cornwall

The egg counts up to Monday 29th June are as follows - they show the mean numbers of eggs per week found around a sample of 20 plants per location:

Rosemary Collier : 01 Jul 2015 09:09 |  Comments (0) |  Close comments |  Report a problem