All entries for Friday 13 October 2017

October 13, 2017

AHDB Aphid News

The latest edition of AHDB Aphid News has just been released.

  • Peach–potato aphids (Myzus persicae) were caught at six suction trap sites and increasing in number at the southernmost sites. The highest number caught was at Wye (47).
  • A single Mealy cabbage aphid (Brevicoryne brassicae) was caught at Wye this week.
  • The willow-carrot aphid (Cavariella aegopodii) was caught in seven suction traps, being found additionally at Broom’s Barn, Wellesbourne and Starcross this week. As well as this; four male individuals were caught at Broom’s Barn this week suggesting that the autumn migration back to willows is continuing.

Pest update from Wellesbourne

Between Tuesday and yesterday we found the following:

On 3 sticky traps:

  • 75 carrot flies

In 3 water traps in a plot of swedes.

  • 20 male cabbage root flies and 5 females
  • 28 bean seed flies
  • 3 pollen beetle
  • 2 flea beetles

We have stopped sampling for cabbage root fly eggs.

We caught 2 silver Y moths in our pheromone traps.


Brassica aphids and virus News

The proportion of peach potato aphid (M. persicae) carrying Turnip yellows virus (TuYV)

Date

Type of trap

Numbers of M. persicae caught

% of those tested carrying TuYV

Wellesbourne, Warwickshire

25/9-01/10/2017

Suction trap

11

25%

02/10-05/10/2017

Yellow water traps

0

-

05/10-09/10/2017

Yellow water traps

6

17%

Kirton, Lincolnshire

25/9-01/10/2017

Suction trap

24

50%

Spalding, Lincolnshire

02/10-05/10/2017

Yellow water traps

1

0%

05/10-09/10/2017

Yellow water traps

2

0%

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 as part of project ‘Developing integrated approaches for pest and disease control in horticultural field crops’ with funding from the BBSRC Horticulture And Potato Initiative (HAPI).

Diana Katschnig and Angela Hambidge, Plant-Virus Interactions Group, University of Warwick; Alex Greenslade, Rothamsted Research & Rothamsted Insect Survey; Carl Sharp, Allium & Brassica Agronomy Ltd.


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  • Update – Wellesbourne, 09–15/10/2017, Suction, 12 caught, 0% carrying TuYV Kirton, 09–15/10/2017, Su… by Angela Hambidge on this entry
  • Update Spalding 28/9 02/10/2017 YWT 12 caught, 25% carrying TuYV. by Angela Hambidge on this entry
  • Update – Wellesbourne 02 – 08/10/2017 Suction, 11 caught, 14% carrying TuYV 09 – 12/10/2017 YWT, 1 c… by Angela Hambidge on this entry
  • Update – Wellesbourne 11/9 – 17/9/2017 Suction trap 1 aphid 0% carrying TuYV Wellesbourne 21/9 – 25/… by Angela Hambidge on this entry
  • Update – Kirton, Lincolnshire 28/8–03/09/2017 Suction trap 4 aphids 33% carrying TuYV Spalding, Linc… by Angela Hambidge on this entry

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