All entries for May 2016

May 31, 2016

Diamond–back moth migration

Several tweets - mainly retweeted by @MigrantMothUK indicate that there was quite a large migration of diamond-back moths into the UK last night.


Pest counts at Wellesbourne

Today there were 90 carrot flies on traps in newly-emerged carrots (3 traps).

In the water traps (3) there were:

  • 2 male and 0 female cabbage root flies
  • 16 bean seed flies
  • 10 pollen beetles
  • 2 flea beetles
  • 2 turnip moths (2 traps)
  • no silver Y moths, no diamond-back moths and no cabbage moths (2 traps each species)

There were 23 cabbage root fly eggs (15 cauliflower plants).


May 27, 2016

Aphid captures by Rothamsted suction traps

The latest edition of AHDB Aphid News has just been published and the Rothamsted suction trap records are here. This is for the week ending 22 May.

  • The peach–potato aphid was caught at nine sites, with hotspots at Writtle (58) and Broom’s Barn (36).
  • The pea aphid was caught at nine sites, including a first arrival at York (18/5) and hotspots at Writtle (41), Broom’s Barn (24) andWellesbourne (19).
  • The willow ̶carrot aphid was caught at all sites, with hotspots at Kirton (137), Broom's Barn (97) and Writtle (81).
  • The cabbage aphid was caught at five sites this week, withhotspots at Kirton (35) and Wellesbourne (24).
  • Single black bean aphids were caught at four sites.
  • A single currant-lettuce aphid (Nasonovia ribisnigri) was caught in theHereford suction-trap.
  • Sycamore aphids are beginning to dominate our current suction-trap samples.

Today's pest counts at Wellesbourne

Today there were 66 carrot flies on traps in newly-emerged carrots (3 traps).

In the water traps (3) there were:

  • 0 male and 2 female cabbage root flies
  • 56 bean seed flies
  • 8 pollen beetles
  • 7 flea beetles
  • 1 cabbage stem weevil
  • 3 turnip moths (2 traps)
  • no silver Y moths, no diamond-back moths and no cabbage moths (2 traps each species)

There were 33 cabbage root fly eggs (15 cauliflower plants).


Parsnip aphids update

In addtion to willow-carrot aphid (Cavariella aegopodii) and Myzus persicae it is possible that two species of parsnip aphid also transmit viruses to carrot - see Adrian Fox's report for FV 382b.

Of these, so far this year just one Cavariella theobaldi has been caught in the suction traps run by the Rothamsted Insect Survey - at Broom’s Barn on 14thMay - and no Cavariella pastinaceae have been captured so far.


May 25, 2016

Aphid and Turnip yellows virus News


Brassica virus and peach potato aphid update

Date

Type of trap

Numbers of M. persicae caught

% of those tested carrying TuYV

Wellesbourne, Warwickshire

09-15/05/2016

Suction trap

4

75%

12-16/05/2016

Yellow water traps

203

44%

16-19/05/2016

Yellow water traps

52

57%

Kirton, Lincolnshire

09-15/05/2016

Suction trap

1

100%

16-19/05/2016

Yellow water traps

6

25%


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).

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


May 24, 2016

Today's pest counts

Today there were 3 carrot flies on traps in our overwintered carrots (3 traps) and 244 carrot flies on traps in newly-emerged carrots (3 traps).

In the water traps (3) there were:

  • 36 male and 19 female cabbage root flies
  • 182 bean seed flies
  • 115 pollen beetles
  • 10 flea beetles
  • 2 cabbage stem weevils

There were 71 cabbage root fly eggs (15 cauliflower plants).


May 21, 2016

Moth migration?

Several tweets from light trappers @MigrantMothUK indicate that there may have been a small influx of silver Y and diamond-back moths but this is not borne out by captures in the network of pheromone traps being run as part of AHDB project FV 440.


May 20, 2016

Aphid activity

The latest edition of AHDB Aphid News has just been published and the Rothamsted suction trap records are here.

FIELD BRASSICAS and LEAFY VEGETABLES

Low numbers of peach–potato aphid are flying in central and southern England. Cabbage aphid has overwintered on some oilseed rape crops and is now flying in low numbers. The first currant-lettuce aphids (Nasonovia ribisnigri) have been caught in the Hereford and Wye suction-traps this week.

CARROTS

The willow–carrot aphid is flying throughout England, with numbers highest in eastern England and the south west. Yellow water trap catches are also picking up the peach–potato aphids in some Yorkshire carrot fields.

PEAS and BEANS

Field reports of aphids in peas and beans in relatively high numbers have been received with many peas and spring beans still at early crop growth stages. Both pea aphid and black bean aphid are present, and while both are virus vectors, the pea aphid is the primary vector for most viruses in both peas and beans. Viruses are often transmitted into crops by low numbers of aphids prior to flowering. The risk for this may be high in 2016. The pea aphid was caught at eight ST sites this week, increasing at six sites with hotspots at Hereford (21) and Rothamsted (21).


  • The peach–potato aphid was caught at ten sites this week, including a first arrival York (15/5), and hotspots at Writtle (27) and Starcross (23).

  •  The pea aphid was caught at eight sites this week, increasing at six sites with hotspots at Hereford (21) and Rothamsted (21).

  •  The willow ̶ carrot aphid was caught at 11 sites this week, with highest numbers in southern and eastern England.

  •  The cabbage aphid has started flying and was caught in low numbers at seven sites this week.

  •  Six black bean aphids were caught at Starcross this week, and also a first arrival at Kirton (15/5).

  •  The first currant-lettuce aphids (Nasonovia ribisnigri) have been caught in the Hereford and Wye suction-traps this week.

  •  Sycamore aphids are beginning to dominate our current suction-trap samples.


Today's pest counts

Today there were 6 carrot flies on traps in our overwintered carrots (3 traps) and 144 carrot flies on traps in newly-emerged carrots (3 traps).

In the water traps (3) there were:

  • 16 male and 15 female cabbage root flies
  • 292 bean seed flies
  • 22 pollen beetles
  • 3 flea beetles

There were 22 cabbage root fly eggs (15 cauliflower plants).



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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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