All entries for Friday 02 June 2017

Pest update from Wellesbourne

Between Tuesday and today we caught:

On 3 sticky traps in each of our carrot plots:

• 8 carrot flies - overwintered carrots
• 108 carrot flies - spring-sown carrots

In 3 water traps in a new plot of swedes.

• 6 male cabbage root flies and 0 female
• 9 bean seed flies
• 793 pollen beetles
• 40 flea beetles
• 16 cabbage stem weevils
• 5 cabbage seed weevils
• 2 cabbage stem flea beetles

We also recovered 8 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 1 silver Y moth and 2 turnip moths (2 traps per species).

We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - one more caught today!

Rosemary Collier : 02 Jun 2017 23:29 |  Comments (0) |  Close comments |  Report a problem

AHDB Aphid News

The latest edition of AHDB Aphid News has been released.

• The peach–potato aphid (Myzus persicae) is a big mover this week, with high numbers in the STs (suction traps) at Broom’s Barn and Wellesbourne, as well as very high numbers in the YWTs in south west England. Tests show these migrants are carrying high levels of Turnip yellows virus.
• The mealy cabbage aphid was caught in both STs and YWTs (yellow water traps) and has been reported from some OSR crops causing direct feeding damage. The threshold for control is >13% plants infested before petal fall in winter OSR and >4% plants infested before petal fall in spring OSR.
• No currant-lettuce aphids (Nasonovia ribisnigri) were caught in the STs this week.
• The willow–carrot aphid migration continues to build throughout England, with highest ST numbers at Kirton (448), Wellesbourne (621) and Hereford (406) and very high numbers in YWTs in northern England.
• Numbers of parsnip aphids also increased, particularly C. pastinaceae at Hereford.

Rosemary Collier : 02 Jun 2017 23:25 |  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; Carl Sharp, Allium & Brassica Agronomy Ltd.

Angela Hambidge : 02 Jun 2017 09:21 |  Tags: Aphid Tuyv |  Comments (0) |  Close comments |  Report a problem