All entries for Friday 14 July 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.
  

Rosemary Collier : 14 Jul 2017 17:33 |  Comments (0) |  Close comments |  Report a problem

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.

Rosemary Collier : 14 Jul 2017 16:41 |  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; Carl Sharp, Allium & Brassica Agronomy Ltd.

Angela Hambidge : 14 Jul 2017 08:40 |  Tags: Aphid Tuyv |  Comments (0) |  Close comments |  Report a problem