All entries for May 2017
May 12, 2017
AHDB Aphid News
The latest edition of AHDB Aphid News has just been published.
- Peach–potato aphids were caught at six suction-trap sites, with highest numbers at Wye and Starcross. The aphid has also been found in yellow water-traps in south western England (moderate virus pressure) and East Anglia (low virus pressure).
- Willow–carrot aphids were caught at Edinburgh and all sites from Preston southwards, with a hotspot at Starcross (28). Parsnip aphid counts were: Cavariella pastinaceae Wye 1 and Cavariella theobaldi Preston 1, Kirton 1, Wellesbourne 1, Writtle 2, Silwood 3, Wye 4 and Starcross 9.
- Black bean aphids were caught at five suction-trap sites and in the yellow water-traps samples from the south west.
- This year’s first currant–lettuce aphid was caught at Wellesbourne this week.
Pest update from Wellesbourne
Between Tuesday and today we caught:
On 3 sticky traps in each of our carrot plots:
- 39 carrot flies - overwintered carrots
- 154 carrot flies - spring-sown carrots
In 4 water traps - 3 near our overwintered swede plot and 1 near some oil seed rape:
- 4 male cabbage root flies and 3 females
- 5 bean seed flies
- 149 pollen beetles
- 35 flea beetles
- 7 cabbage stem weevils
- 1 cabbage seed weevil
We also recovered 20 cabbage root fly eggs from the soil around 15 cauliflower plants.
We caught one diamond-back moth (2 pheromone traps).
We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - none so far.
May 11, 2017
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 |
|||
24/4-30/4/2017 |
Suction trap |
1 |
100% |
02/5-04/5/2017 |
Yellow water traps |
8 |
75% |
04/5-08/5/2017 |
Yellow water traps |
22 |
77% |
Kirton, Lincolnshire |
|||
24/4-30/4/2017 |
Suction trap |
0 |
- |
Spalding, Lincolnshire |
|||
01/5-04/5/2017 |
Yellow water traps |
0 |
- |
04/5-08/5/2017 |
Yellow water traps |
1 |
100% |
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.
May 10, 2017
Aphid counts in carrot plots
We have been monitoring the numbers of aphids on some young carrot plants at Wellesbourne. They are the total numbers of aphids on 3 x 0.5 m lengths of row.
Date |
Winged adults |
Wingless adults and nymphs |
Parasitised aphids |
4 May |
1 |
3 |
0 |
10 May |
4 |
1 |
0 |
May 09, 2017
Pest update from Wellesbourne
Between Friday and today we caught:
On 3 sticky traps in each of our carrot plots:
- 78 carrot flies - overwintered carrots
- 206 carrot flies - spring-sown carrots
In 4 water traps - 3 near our overwintered swede plot and 1 near some oil seed rape:
- 5 male cabbage root flies and 2 females
- 23 bean seed flies
- 215 pollen beetles
- 27 flea beetles
- 16 cabbage stem weevils
- 3 cabbage seed weevils
- 4 cabbage stem flea beetle
We also recovered 45 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 but none caught so far.
We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - none so far.
May 05, 2017
AHDB Aphid News – for week ending 30th April
The latest edition of AHDB Aphid News has just been published.
- Peach–potato aphids were caught at four sites this bulletin week (Broom’s Barn 1, Rothamsted 4, Wye 1 and Starcross 2), including first arrivals at three sites (five to ten days earlier than forecast).
- Willow ̶carrot aphids were caught at seven sites (Preston 1, Kirton 2, Broom’s Barn 3, Writtle 2, Silwood 8, Wye 1 and Starcross 4). Three of these individuals were first arrivals (Preston, Kirton and Wye) and were close to the ten-year means. Parsnip aphid counts were: Cavariella pastinaceae Wye 1 and Cavariella theobaldi Broom’s Barn 1, Silwood 16 and Starcross 1.
- A single pea aphid was caught at Silwood and a single black bean aphid at Writtle this bulletin week.
Pest update from Wellesbourne
Between Tuesday and today we caught:
On 3 sticky traps in each of our carrot plots:
- 90 carrot flies - overwintered carrots
- 167 carrot flies - spring-sown carrots
In 4 water traps - 3 near our overwintered swede plot and 1 near some oil seed rape:
- 34 male cabbage root flies and 1 female
- 54 bean seed flies
- 96 pollen beetles
- 8 flea beetles
- 4 cabbage stem weevils
- 2 cabbage seed weevils
- 1 cabbage stem flea beetle
We also recovered 61 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 but none caught so far.
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 |
|||
17/4-23/4/2017 |
Suction trap |
0 |
- |
24/4-27/4/2017 |
Yellow water traps |
0 |
- |
27/4-02/5/2017 |
Yellow water traps |
61 |
75% |
Kirton, Lincolnshire |
|||
17/4-23/4/2017 |
Suction trap |
1 |
100% |
Spalding, Lincolnshire |
|||
24/4-27/4/2017 |
Yellow water traps |
1 |
0% |
27/4-02/5/2017 |
Yellow water traps |
6 |
33% |
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.
May 02, 2017
Pest update from Wellesbourne
Between Friday and today we caught:
On 3 sticky traps in each of our carrot plots:
- 164 carrot flies - overwintered carrots
- 52 carrot flies - spring-sown carrots
In 4 water traps - 3 near our overwintered swede plot and 1 near some oil seed rape:
- 41 male cabbage root flies and 7 females
- 55 bean seed flies
- 94 pollen beetles
- 8 flea beetles
- 4 cabbage stem weevils
- 1 cabbage seed weevil
- 1 cabbage stem flea beetle
We also recovered 104 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 but none caught so far.