April 20, 2018

AHDB Aphid News

The first edition of AHDB Aphid News for 2018 has just been released:

  • The switch from weekly to daily suction-trapping commenced on 5 March, before that catches were weekly.
  • The sudden change in weather, including the upturn in air temperature this calendar week, has prompted the beginning of this year’s aphid reporting.
  • No peach–potato aphids (Myzus persicae) or willow-carrot aphids (Cavariella aegopodii) have been caught so far this year.
  • The shallot aphid (Myzus ascalonicus) is the most numerous aphid species in the suction-trap samples to date and has been caught in all of the traps from Kirton south.

April 17, 2018

Pest updates from Wellesbourne

Between 10th April and 17th April our 3 yellow water traps captured:

  • Cabbage root flies - 12 males and 2 females
  • Bean seed flies - 33
  • Pollen beetles - 1224
  • Flea beetles - 3
  • Cabbage stem weevil - 35
  • Cabbage stem flea beetle - 1

We also checked the carrot fly traps and still no flies captured so far in 2018!

We caught 1 diamond-back moth in our 2 traps and no silver Y moths (2 traps).


April 10, 2018

Pest counts at Wellesbourne

Between 3rd and 10th April our 3 yellow water traps captured:

  • Cabbage root flies - 1 female
  • Bean seed flies - 22
  • Pollen beetles - 1375
  • Flea beetles - 1
  • Cabbage stem weevil - 9

We also checked the carrot fly traps and still no flies captured so far in 2018!


April 03, 2018

Trap captures today

Between 27th March and today our 3 yellow water traps captured:

  • Cabbage root flies - 0
  • Bean seed flies - 31
  • Pollen beetles - 10
  • Flea beetles - 0
  • Cabbage stem weevil - 19

We also checked the carrot fly traps and still no flies captured so far in 2018!


First trap captures of the year

We put three yellow water traps out on 20th March and this is what we found in them on 27th March:

  • Cabbage root flies - 0
  • Bean seed flies - 11
  • Pollen beetles - 183
  • Flea beetles - 2
  • Cabbage stem weevil - 19

We also checked the carrot fly traps and no flies captured so far in 2018!


March 22, 2018

Carrot fly activity during the winter

For the last two years we have extended the period when we have carrot fly traps out in the field. In 2016 we put the traps out on 23 February, caught the first fly on 1st March and the last fly by 20th December. Since then traps have been out continuously and in 2017 we caught our first fly on 7th March and our last fly on 28th November. We're still waiting to catch the first fly in 2018!


First aphid forecasts for 2018

Forecasts for three important pest aphids of vegetable and salad crops – peach-potato aphid (Myzus persicae), potato aphid (Macrosiphum euphorbiae) and cabbage aphid (Brevicoryne brassicae) have been released via AHDB Aphid News.

Despite the brief cold snap at the end of February, typical winter temperatures have fallen in line with the long-term average throughout most of England, meaning that first flights of these aphids are likely to occur at the ‘normal’ time – and neither be very early or very late. Temperatures in Scotland, however, were around half a degree lower than the long-term average and the first aphid flights could be around a week later than average in these areas.

The long run of aphid data from the suction-trap network, managed by Rothamsted Research, combined with the long run of weather data available from the Met Office and others, make it possible for the start of aphid flights and aphid abundance in spring and early summer to be forecast. The mean temperature in January and February is critical in driving the results arising from the aphid forecasting service.

Forecasts are available only for aphid species which pass the winter in active stages, rather than as cold-hardy eggs, as they are able to take advantage of warm conditions. Forecasts for the species that overwinter as eggs (willow-carrot aphid, lettuce root aphid, currant-lettuce aphid, black bean aphid) will be available later as part of the AHDB Pest Bulletin.


December 01, 2017

AHDB Aphid News

The last edition of AHDB News for 2017 has just been published.

  • Single Peach–potato aphids (Myzus persicae) were recorded from York and Wellesbourne.
  • No Mealy cabbage aphids (Brevicoryne brassicae) were recorded this week.
  • Female Willow-carrot aphids (Cavariella aegopodii) were found at two sites this week with one male individual recorded from Preston.

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

23/10-29/10/2017

Suction trap

24

14%

30/10-05/11/2017

Suction trap

13

0%

30/10-06/11/2017

Yellow water traps

3

0%

06/11-13/11/2017

Yellow water traps

1

0%

Kirton, Lincolnshire

23/10-29/10/2017

Suction trap

9

100%

30/10-05/11/2017

Suction trap

0

-

Spalding, Lincolnshire

23/10-30/10/2017

Yellow water traps

0

-

30/10-06/11/2017

Yellow water traps

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.


November 18, 2017

AHDB Aphid News

The latest edition of AHDB Aphid News has been published.

Peach–potato aphids (Myzus persicae) were recorded from six suction trap sites, increasing in number at two sites. The highest number was found at Writtle (10).

No Mealy cabbage aphids (Brevicoryne brassicae) were recorded this week.

The willow-carrot aphid (Cavariella aegopodii) was found at three sites this week. Nine male individuals were recorded across the country suggesting that the autumn migration back to willows is continuing.


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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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