June 23, 2017

AHDB Aphid News

The latest edition of AHDB Aphid News has just been released - for the week ending 18 June.

The weather pattern returned to warm and settled after the wet and windy interlude, with it came a revived flush of aphid flight activity. This might be short lived as the subsequent heatwave may be too hot for some to handle, since many aphid species struggle to fly above 25°C. There are field reports of lots of parasitoids about, but fewer aphid predators at present. Monitoring crops is strongly advised as on the ground aphids will be multiplying.

  • The peach–potato aphid (Myzus persicae) numbers increased this week, with highest numbers in the ST (suction traps) across eastern England. Tests continue show that 60-70% of these migrants are carrying Turnip yellows virus. Field reports suggest peach–potato aphids are now leaving maturing OSR to find alternative hosts.
  • The mealy cabbage aphid was caught in both ST and YWT (yellow water traps) in low numbers. Field reports indicate numbers are below the threshold of >4% plants infested before petal fall in spring OSR.
  • No currant-lettuce aphids (Nasonovia ribisnigri) were caught in the ST this week.
  • Numbers of the willow–carrot aphid and the parsnip aphids have gone back up this week.

Pest update from Wellesbourne

Between Tuesday and today we caught:

On 3 sticky traps in each of our carrot plots:

  • 3 carrot flies - overwintered carrots
  • 5 carrot flies - spring-sown carrots

In 3 water traps in a new plot of swedes.

  • 28 male cabbage root flies and 21 females
  • 16 bean seed flies
  • 2741 pollen beetles
  • 20 flea beetles
  • 22 cabbage stem weevils
  • 1 cabbage seed weevil
  • 21 cabbage stem flea beetles

We also recovered 81 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).

We caught 2 turnip moths and one diamond-back moth (2 traps per species) in our pheromone traps.

No narcissus flies!


June 22, 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

05/6-11/6/2017

Suction trap

11

73%

12/6-15/6/2017

Yellow water traps

816

71%

15/6-19/6/2017

Yellow water traps

960

71%

Kirton, Lincolnshire

05/6-11/6/2017

Suction trap

12

42%

Spalding, Lincolnshire

12/6-15/6/2017

Yellow water traps

-

-

15/6-19/6/2017

Yellow water traps

1898

59%

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.


June 20, 2017

Pest update from Wellesbourne

Between Friday and today we caught:

On 3 sticky traps in each of our carrot plots:

  • 1 carrot flies - overwintered carrots
  • 27 carrot flies - spring-sown carrots

In 3 water traps in a new plot of swedes.

  • 25 male cabbage root flies and 17 females
  • 14 bean seed flies
  • 1981 pollen beetles
  • 149 flea beetles
  • 43 cabbage stem weevils
  • 3 cabbage seed weevil
  • 20 cabbage stem flea beetles

We also recovered 27 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).

We caught 4 silver Y moths and 3 turnip moths (2 traps per species) in our pheromone traps.

We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - none caught today!


June 16, 2017

AHDB Aphid News

The latest edition of AHDB Aphid News has just been published - for the week ending 11th June.

The wet and very windy weather in the week ending 11th June greatly restricted aphid flight, with numbers in the traps falling dramatically. Disruption on the ground will have been much less pronounced and aphid populations already in crops will be multiplying as conditions improve. Reports of predators and parasitoids are now coming in. Monitoring crops is strongly advised.

  • The peach–potato aphid (Myzus persicae) numbers fell this week, with highest numbers in the ST (suction trap) at York. Tests continue show that 60-70% of these migrants are carrying Turnip yellows virus.
  • The mealy cabbage aphid was caught in both ST and YWT (yellow water trap) in low numbers and it has also been reported from some OSR crops in several counties across southern England.
  • No currant-lettuce aphids (Nasonovia ribisnigri) were caught in the ST this week.
  • Numbers of the willow–carrot aphid and the parsnip aphids have all substantially declined this week.

Pest update from Wellesbourne

Between Tuesday and today we caught:

On 3 sticky traps in each of our carrot plots:

  • 7 carrot flies - overwintered carrots
  • 33 carrot flies - spring-sown carrots

In 3 water traps in a new plot of swedes.

  • 43 male cabbage root flies and 14 females
  • 36 bean seed flies
  • 1112 pollen beetles
  • 61 flea beetles
  • 47 cabbage stem weevils
  • 4 cabbage seed weevil
  • 6 cabbage stem flea beetles

We also recovered 0 cabbage root fly eggs from the soil around 15 cauliflower plants.

We caught 1 silver Y moth and 2 turnip moths (2 traps per species) in our pheromone traps.

We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - none caught today!


June 15, 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

29/5-04/6/2017

Suction trap

86

64%

05/6-08/6/2017

Yellow water traps

11

82%

08/6-12/6/2017

Yellow water traps

46

79%

Kirton, Lincolnshire

29/5-04/6/2017

Suction trap

45

36%

Spalding, Lincolnshire

05/6-08/6/2017

Yellow water traps

44

59%

08/6-12/6/2017

Yellow water traps

-

-

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.


June 13, 2017

Pest update from Wellesbourne

Between Friday and today we caught:

On 3 sticky traps in each of our carrot plots:

  • 11 carrot flies - overwintered carrots
  • 80 carrot flies - spring-sown carrots

In 3 water traps in a new plot of swedes.

  • 6 male cabbage root flies and 3 females
  • 29 bean seed flies
  • 439 pollen beetles
  • 5 flea beetles
  • 3 cabbage stem weevils
  • 8 cabbage stem flea beetles

We also recovered 1 cabbage root fly egg from the soil around 15 cauliflower plants.

We caught 1 silver Y moth and 4 turnip moths (2 traps per species).

We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - none caught today!


June 09, 2017

Pest update from Wellesbourne

Between Tuesday and today we caught:

On 3 sticky traps in each of our carrot plots:

  • 7 carrot flies - overwintered carrots
  • 55 carrot flies - spring-sown carrots

In 3 water traps in a new plot of swedes.

  • 1 male cabbage root fly and 2 female
  • 35 bean seed flie
  • 244 pollen beetles
  • 9 flea beetles
  • 2 cabbage stem weevils
  • 5 cabbage stem flea beetles

We also recovered 2 cabbage root fly eggs from the soil around 15 cauliflower plants.

We set up pheromone traps for silver Y moth, diamond-back moth and turnip moth on 18th April and caught 7 silver Y moths and 5 turnip moths (2 traps per species).

We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - none caught today!


AHDB Aphid News

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

  • The peach–potato aphid (Myzus persicae) numbers continued to increase this week, with high numbers in the ST (suction trap) at Broom’s Barn and Wellesbourne, as well as very high numbers in the YWT (yellow water trap) in northern England. Tests show that 60-70% of these migrants are carrying Turnip yellows virus.
  • The potato aphid (Macrosiphum euphorbiae) and the glasshouse and potato aphid (Aulacorthum solani) have been caught in above average numbers for the time of year in the ST and in a range of YWT.
  • Black bean aphids are being caught across the country in low numbers.
  • The mealy cabbage aphid was caught in both ST and YWT, with highest numbers in the midlands where it has also been reported from some OSR crops.
  • No currant-lettuce aphids (Nasonovia ribisnigri) were caught in the ST this week.
  • The willow–carrot aphid migration has started to decline this week, with high ST numbers still at Kirton (255). Numbers of parsnip aphids are high at Wellesbourne and Hereford.

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