All entries for June 2017
June 30, 2017
AHDB Aphid News
The latest edition of AHDB Aphid News has just been released.
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Black bean aphids have been caught across the country in both ST (suction traps) and YWT (yellow water traps) this week.
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The peach–potato aphid (Myzus persicae) numbers increased at seven ST sites with highest numbers at York (454), Kirton (142) and Newcastle (125). Tests show that up to 75% of these migrants are carrying Turnip yellows virus.
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Field reports confirm peach–potato aphids are leaving rapidly maturing OSR to find alternative summer hosts.
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The mealy cabbage aphid was caught at ten ST sites this week, increasing at five sites with the highest numbers at Preston (12) and Wellesbourne (12), and in YWT in low numbers.
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Two currant-lettuce aphids (Nasonovia ribisnigri) were caught at Wellesbourne and one at York ST this week.
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Numbers of the willow–carrot aphid are highest at Newcastle and the parsnip aphids are highest at Kirton.
Rosemary Collier
30 Jun 2017 17:03
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June 29, 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 |
|||
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12/6-18/6/2017 |
Suction trap |
58 |
93% |
|
19/6-22/6/2017 |
Yellow water traps |
4472 |
88% |
|
22/6-26/6/2017 |
Yellow water traps |
1036 |
60% |
|
Kirton, Lincolnshire |
|||
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12/6-18/6/2017 |
Suction trap |
93 |
71% |
|
Spalding, Lincolnshire |
|||
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19/6-22/6/2017 |
Yellow water traps |
1092 |
69% |
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22/6-26/6/2017 |
Yellow water traps |
160 |
73% |
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
29 Jun 2017 13:57
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Tags: Aphid Tuyv
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June 27, 2017
Pest update from Wellesbourne
Between Friday and today we caught:
On 3 sticky traps in each of our carrot plots:
- 3 carrot flies - overwintered carrots
- 9 carrot flies - spring-sown carrots
In 3 water traps in a plot of swedes and 1 trap near oil seed rape.
- 48 male cabbage root flies and 52 females
- 31 bean seed flies
- 2603 pollen beetles
- 13 flea beetles
- 5 cabbage stem weevils
- 0 cabbage seed weevil
- 30 cabbage stem flea beetles
We also recovered 125 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).
We caught 2 turnip moths and 4 silver Y moths (2 traps per species) in our pheromone traps.
No narcissus flies!
Rosemary Collier
27 Jun 2017 17:28
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June 23, 2017
AHDB Aphid News
The latest edition of AHDB Aphid News has just been released - for the week ending 18 June.
The weather pattern returned to warm and settled after the wet and windy interlude, with it came a revived flush of aphid flight activity. This might be short lived as the subsequent heatwave may be too hot for some to handle, since many aphid species struggle to fly above 25°C. There are field reports of lots of parasitoids about, but fewer aphid predators at present. Monitoring crops is strongly advised as on the ground aphids will be multiplying.
- The peach–potato aphid (Myzus persicae) numbers increased this week, with highest numbers in the ST (suction traps) across eastern England. Tests continue show that 60-70% of these migrants are carrying Turnip yellows virus. Field reports suggest peach–potato aphids are now leaving maturing OSR to find alternative hosts.
- The mealy cabbage aphid was caught in both ST and YWT (yellow water traps) in low numbers. Field reports indicate numbers are below the threshold of >4% plants infested before petal fall in spring OSR.
- No currant-lettuce aphids (Nasonovia ribisnigri) were caught in the ST this week.
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Numbers of the willow–carrot aphid and the parsnip aphids have gone back up this week.
Rosemary Collier
23 Jun 2017 16:43
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Pest update from Wellesbourne
Between Tuesday and today we caught:
On 3 sticky traps in each of our carrot plots:
- 3 carrot flies - overwintered carrots
- 5 carrot flies - spring-sown carrots
In 3 water traps in a plot of swedes and 1 trap near oil seed rape.
- 28 male cabbage root flies and 21 females
- 16 bean seed flies
- 2741 pollen beetles
- 20 flea beetles
- 22 cabbage stem weevils
- 1 cabbage seed weevil
- 21 cabbage stem flea beetles
We also recovered 81 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).
We caught 2 turnip moths and one diamond-back moth (2 traps per species) in our pheromone traps.
No narcissus flies!
Rosemary Collier
23 Jun 2017 16:38
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June 22, 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 |
|||
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05/6-11/6/2017 |
Suction trap |
11 |
73% |
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12/6-15/6/2017 |
Yellow water traps |
816 |
71% |
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15/6-19/6/2017 |
Yellow water traps |
960 |
71% |
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Kirton, Lincolnshire |
|||
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05/6-11/6/2017 |
Suction trap |
12 |
42% |
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Spalding, Lincolnshire |
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12/6-15/6/2017 |
Yellow water traps |
- |
- |
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15/6-19/6/2017 |
Yellow water traps |
1898 |
59% |
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
22 Jun 2017 15:47
| Tags: Aphid Tuyv
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June 20, 2017
Pest update from Wellesbourne
Between Friday and today we caught:
On 3 sticky traps in each of our carrot plots:
- 1 carrot flies - overwintered carrots
- 27 carrot flies - spring-sown carrots
In 3 water traps in a plot of swedes and 1 trap near oil seed rape.
- 25 male cabbage root flies and 17 females
- 14 bean seed flies
- 1981 pollen beetles
- 149 flea beetles
- 43 cabbage stem weevils
- 3 cabbage seed weevil
- 20 cabbage stem flea beetles
We also recovered 27 cabbage root fly eggs from the soil around 15 cauliflower plants (new plants).
We caught 4 silver Y moths and 3 turnip moths (2 traps per species) in our pheromone traps.
We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - none caught today!
Rosemary Collier
20 Jun 2017 16:32
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June 16, 2017
AHDB Aphid News
The latest edition of AHDB Aphid News has just been published - for the week ending 11th June.
The wet and very windy weather in the week ending 11th June greatly restricted aphid flight, with numbers in the traps falling dramatically. Disruption on the ground will have been much less pronounced and aphid populations already in crops will be multiplying as conditions improve. Reports of predators and parasitoids are now coming in. Monitoring crops is strongly advised.
- The peach–potato aphid (Myzus persicae) numbers fell this week, with highest numbers in the ST (suction trap) at York. Tests continue show that 60-70% of these migrants are carrying Turnip yellows virus.
- The mealy cabbage aphid was caught in both ST and YWT (yellow water trap) in low numbers and it has also been reported from some OSR crops in several counties across southern England.
- No currant-lettuce aphids (Nasonovia ribisnigri) were caught in the ST this week.
- Numbers of the willow–carrot aphid and the parsnip aphids have all substantially declined this week.
Rosemary Collier
16 Jun 2017 15:43
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Pest update from Wellesbourne
Between Tuesday and today we caught:
On 3 sticky traps in each of our carrot plots:
- 7 carrot flies - overwintered carrots
- 33 carrot flies - spring-sown carrots
In 3 water traps in a plot of swedes and 1 trap near oil seed rape.
- 43 male cabbage root flies and 14 females
- 36 bean seed flies
- 1112 pollen beetles
- 61 flea beetles
- 47 cabbage stem weevils
- 4 cabbage seed weevil
- 6 cabbage stem flea beetles
We also recovered 0 cabbage root fly eggs from the soil around 15 cauliflower plants.
We caught 1 silver Y moth and 2 turnip moths (2 traps per species) in our pheromone traps.
We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - none caught today!
Rosemary Collier
16 Jun 2017 15:19
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June 15, 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 |
|||
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29/5-04/6/2017 |
Suction trap |
86 |
64% |
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05/6-08/6/2017 |
Yellow water traps |
11 |
82% |
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08/6-12/6/2017 |
Yellow water traps |
46 |
79% |
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Kirton, Lincolnshire |
|||
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29/5-04/6/2017 |
Suction trap |
45 |
36% |
|
Spalding, Lincolnshire |
|||
|
05/6-08/6/2017 |
Yellow water traps |
44 |
59% |
|
08/6-12/6/2017 |
Yellow water traps |
- |
- |
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
15 Jun 2017 12:19
| Tags: Aphid Tuyv
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