All entries for July 2017

July 30, 2017

AHDB Aphid News

The latest edition of AHDB Aphid News has been issued.

  • Black bean aphids were caught at five sites in the ST (suction traps) and across the country in YWT (yellow water traps) this week, with the highest number caught in the ST at Gogarbank (28).
  • The peach–potato aphid (Myzus persicae) was caught in single figures at seven ST sites this week with the highest number being caught at Newcastle (4). Tests show that up to 52% of these migrants are carrying Turnip yellows virus.
  • The mealy cabbage aphid was caught at four sites this week. The highest number caught was at Hereford (10). Mealy cabbage aphids are also still being found in YWT in the Grampian and North of Scotland regions, the latter of which has found them in higher than average numbers.
  • Currant-lettuce aphids (Nasonovia ribisnigri) were caught in ST at York (4), and Kirton (1) this week.
  • Single individuals of the willow ̶ carrot aphid were caught at Gogarbank and Newcastle this week. The highest number of parsnip aphids were caught at York.

Pest update for Wellesbourne 28th July

Between Tuesday 25th July and Friday 28th July we caught:

On 3 sticky traps:

  • 28 carrot flies

In 3 water traps in a plot of swedes.

  • 7 male cabbage root flies and 4 females
  • 44 bean seed flies
  • 166 pollen beetles
  • 42 flea beetles
  • 195 cabbage stem weevils
  • 14 cabbage stem flea beetles

We also recovered 34 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).

We caught 1 silver Y moth in our pheromone traps.


Pest update from Wellesbourne for 25th July

Between Friday 21st July and Tuesday 25th July we caught:

On 3 sticky traps:

  • 28 carrot flies

In 3 water traps in a plot of swedes.

  • 14 male cabbage root flies and 6 females
  • 28 bean seed flies
  • 258 pollen beetles
  • 57 flea beetles
  • 389 cabbage stem weevils
  • 1 cabbage seed weevil
  • 1 cabbage stem flea beetle

We also recovered 22 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).

We caught 1 diamond-back moth and 1 silver Y moth in our pheromone traps.


July 27, 2017

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

10/7-16/7/2017

Suction trap

26

86%

17/7-20/7/2017

Yellow water traps

26

46%

20/7-24/7/2017

Yellow water traps

9

33%

Kirton, Lincolnshire

10/7-16/7/2017

Suction trap

1

0%

Spalding, Lincolnshire

17/7-20/7/2017

Yellow water traps

5

40%

20/7-24/7/2017

Yellow water traps

1

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.


July 21, 2017

AHDB Aphid News

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

  • Black bean aphids have been caught across the country in both ST and YWT this week, the highest number was caught in the ST at York (23).
  • The peach–potato aphid (Myzus persicae) numbers decreased at most ST sites this week with the highest numbers found at Wellesbourne (26). Tests show that up to 62% of these migrants are carrying Turnip yellows virus.
  • The mealy cabbage aphid was caught at seven ST sites this week, decreasing at twelve sites with the highest numbers caught at Wellesbourne (9) and Hereford (9). Lower numbers were also found in YWT compared to the previous two weeks.
  • Currant-lettuce aphids (Nasonovia ribisnigri) were caught in ST at Wellesbourne (1), Hereford (1) and Starcross (1) this week.
  • A single willow–carrot aphid was caught at Kirton and the parsnip aphids were also highest at Kirton.

Pest update from Wellesbourne

Between Friday and today we caught:

On 3 sticky traps:

  • 47 carrot flies

In 3 water traps in a plot of swedes and 1 trap near oil seed rape.

  • 15 male cabbage root flies and 28 females
  • 39 bean seed flies
  • 302 pollen beetles
  • 18 flea beetles
  • 57 cabbage stem weevils
  • 19 cabbage stem flea beetles

We also recovered 55 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).

We caught 3 diamond-back moths in our pheromone traps.


July 20, 2017

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

03/7-09/7/2017

Suction trap

80

86%

10/7-13/7/2017

Yellow water traps

224

72%

13/7-17/7/2017

Yellow water traps

95

47%

Kirton, Lincolnshire

03/7-09/7/2017

Suction trap

16

50%

Spalding, Lincolnshire

06/7-10/7/2017

Yellow water traps

44

77%

10/7-13/7/2017

Yellow water traps

13

46%

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.


July 18, 2017

Pest update from Wellesbourne

Between Friday and today we caught:

On 3 sticky traps:

  • 114 carrot flies

In 3 water traps in a plot of swedes and 1 trap near oil seed rape.

  • 11 male cabbage root flies and 24 females
  • 34 bean seed flies
  • 217 pollen beetles
  • 70 flea beetles
  • 113 cabbage stem weevils
  • 13 cabbage stem flea beetles

We also recovered 25 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).

We caught 7 diamond-back moths in our pheromone traps.


July 14, 2017

AHDB Aphid News

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

  • Monitoring crops is still advised, total numbers for several aphid species have generally increased.

  • Black bean aphids have been caught across England in both ST (suction traps) and YWT (yellow water traps) this week, as well as YWT in central parts of Scotland. The highest number caught in the ST was at York (28).

  • The peach–potato aphid (Myzus persicae) numbers increased at six ST sites with the highest number found at Wellesbourne (80). Tests show that up to 77% of these migrants are carrying Turnip yellows virus.
  • The mealy cabbage aphid was caught at twelve ST sites this week, increasing at ten sites with the highest number at Hereford (44). Very high numbers were found in YWT from the Midlands as well as higher than average numbers in the North of Scotland.
  • Currant-lettuce aphids (Nasonovia ribisnigri) were caught in ST at Wellesbourne (8) and Hereford (10) this week.
  • Numbers of the willow–carrot aphid were highest at Newcastle and parsnip aphids were highest at York and Kirton.

Pest update from Wellesbourne

Between Tuesday and today we caught:

On 3 sticky traps:

  • 36 carrot flies

In 3 water traps in a plot of swedes and 1 trap near oil seed rape.

  • 10 male cabbage root flies and 30 females
  • 34 bean seed flies
  • 307 pollen beetles
  • 24 flea beetles
  • 102 cabbage stem weevils
  • 6 cabbage stem flea beetles

We also recovered 59 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).

We caught 8 diamond-back moths and 3 silver Y moths in our pheromone traps.


July 2017

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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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