All entries for June 2016

Pest update from Wellesbourne

Since last Friday we have captured:

In pheromone traps (2 per species):

• Turnip moth = 2
• Silver Y moth = 0
• Cabbage moth = 0
• Diamond-back moth = 19

On 3 sticky traps:

• Carrot fly = 6

In 3 water traps:

• Cabbage root fly males = 7
• Cabbage root fly females = 23
• Bean seed flies = 120
• Flea beetles = 16
• Pollen beetles = 525
• Cabbage stem weevils = 3

Cabbage root fly eggs = 9 (15 plants)

Rosemary Collier : 28 Jun 2016 16:25 |  Comments (0) |  Close comments |  Report a problem

Brassica aphids and virus News

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

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; Simon Jackson, Allium & Brassica Agronomy Ltd.

Angela Hambidge : 28 Jun 2016 14:33 |  Tags: Aphid Tuyv |  Comments (0) |  Close comments |  Report a problem

The diamond–back moth infestation at Wellesbourne

One of the trials on cabbage at Wellesbourne (focused on aphids) was infested with diamond-back moth and we did a small pre-spray count (4 x 5 plants) before it was treated (with spinosad (Tracer) last Friday). There were an average of 8.7 caterpillars per plant on Friday before the spray was applied and 0.6 caterpillars per plant yesterday.

As the whole trial was treated there is no 'untreated control' so we cannot be certain that the numbers of caterpillars didn't decrease for another reason e.g. the weather - but the results do suggest that they succumbed due to the treatment.

Rosemary Collier : 28 Jun 2016 09:38 |  Comments (0) |  Close comments |  Report a problem

Silver Y moth

There has been some silver Y moth activity over the weekend. We caught 3 moths in our light traps over Saturday nith/Sunday morning and they have also been captured in some of the traps in the network of traps run through AHDB project FV 440.

Rosemary Collier : 27 Jun 2016 07:06 |  Comments (0) |  Close comments |  Report a problem

Brassica pests at Wellesbourne

Pest pressure on the brasica crops at Wellesbourne is currently very high. We have captured very large numbers of aphids in the suction trap - both Myzus persicae and Brevicoryne brassicae - and they can be found on plants. Some of these have been parastised. The plants are also quite heavily infested with diamond-back moth larvae and one pupa was found yesterday. Other pests include flea beetles and small numbers of cabbage whitefly. One of the diamond-back moth larvae is shown below.

Rosemary Collier : 25 Jun 2016 07:39 |  Comments (0) |  Close comments |  Report a problem

Update on trap captures at Wellesbourne

Since Tuesday we have captured:

In pheromone traps (2 per species):

• Turnip moth = 0
• Silver Y moth = 0
• Cabbage moth = 0
• Diamond-back moth = 60

On 3 sticky traps:

• Carrot fly = 9

In 3 water traps:

• Cabbage root fly males = 2
• Cabbage root fly females = 12
• Bean seed flies = 46
• Flea beetles = 88
• Pollen beetles = 445
• Cabbage stem weevils = 4

Cabbage root fly eggs = 7 (15 plants)

Rosemary Collier : 24 Jun 2016 17:08 |  Comments (0) |  Close comments |  Report a problem

Latest update on Rothamsted suction trap captures

The latest edition of AHDB Aphid News has just been published and the counts on which is based (for the week ending 19th June) are here.

• Numbers of the peach–potato aphid were down on last week’s highs, but still with hotspots at Wellesbourne (278) and Kirton (107).
• The cabbage aphid was caught at six sites, with a hotspotat Wellesbourne (108).
• The willow ̶carrot aphid was caught at all sites, with numbers increasing in the North, but generally falling elsewhere. There were hotspots at York (103) and Kirton (105).
• The pea aphid was caught at 11 sites, with highest numbers at Wellesbourne (28) and Kirton (24).
• Starcross continues as a very distinctive hotspot for black bean aphids, elsewhere it has been reluctant to visit the suction traps.
• A single currant-lettuce aphid (Nasonovia ribisnigri) was caught at Wellesbourne.
• Numbers of parsnip aphids were down (Cavariella pastinaceae at Preston 22, Wellesbourne 2, York 12 and Wye 2 plus Cavariella theobaldi at Preston 20 and Starcross 1).
  

Rosemary Collier : 24 Jun 2016 15:39 |  Comments (0) |  Close comments |  Report a problem

Update on pest captures at Wellesbourne

Since Friday we have captured:

In pheromone traps (2 per species):

• Turnip moth = 6
• Silver Y moth = 1
• Cabbage moth = 0
• Diamond-back moth = 34

On 3 sticky traps:

• Carrot fly = 17

In 3 water traps:

• Cabbage root fly males = 1
• Cabbage root fly females = 5
• Bean seed flies = 38
• Flea beetles = 27
• Pollen beetles = 225
• Cabbage stem weevils = 1
• Cabbage seed weevils = 0

Cabbage root fly eggs = 0 (15 plants)

Rosemary Collier : 21 Jun 2016 17:36 |  Comments (0) |  Close comments |  Report a problem

Brassica aphids and virus News

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

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; Simon Jackson, Allium & Brassica Agronomy Ltd.

Angela Hambidge : 21 Jun 2016 14:05 |  Tags: Aphid Tuyv |  Comments (0) |  Close comments |  Report a problem

Update on captures by Rothamsted suction traps

The latest edition of AHDB Aphid News has just been released and the most recent information about aphid captures is here - for captures in the week ending 12th June.

• Numbers of peach–potato aphids rose significantly with big hotspots at Wellesbourne (800) and Hereford (226) and high numbers generally across much of central England.
• The cabbage aphid was caught at 11 sites, with two discrete hotspots at Wellesbourne (1050) and Hereford (907).
• The willow ̶carrot aphid was caught at all sites, with numbers increasing at 11 sites and a big hotspot at Preston (818).
• The pea aphid was caught at ten sites, with numbers increasing at nine sites and a hotspot at Wellesbourne (98).
• Starcross continues as a very distinctive hotspot for black bean aphids, so far elsewhere it has been reluctant to visit the suction-traps.
• The currant-lettuce aphid (Nasonovia ribisnigri) was caught at Dundee and Kirton.
• Numbers of parsnip aphids increased, particularly at Preston (Cavariella pastinaceae at Preston 120, Wellesbourne 20, York 8 and Silwood 2; Cavariella theobaldi at Preston 20).
  

Rosemary Collier : 17 Jun 2016 16:49 |  Comments (0) |  Close comments |  Report a problem