All entries for July 2014

Pest update from Wellesbourne

Between Friday (25th) and Tuesday (29th) we captured:

• 24 carrot flies on traps in this year's crop of carrots (3 traps).
• Carrot fly numbers still have not increased as 'expected' and it may be that the recent hot weather has caused at least some of the population to aestivate in the pupal stage. A similar thing happened at this time last year and although we captured low numbers of flies over an extended period, damage was high when we harvested our trials in the early autumn.

We collected a total of 96 cabbage root fly eggs from around our 15 newly-planted cauliflower plants.

The 3 yellow water traps caught:

7 male and 33 female cabbage root flies

• 23 bean seed flies
• 8 pollen beetles
• 93 flea beetles
• 1 small white butterfly and we have started to see caterpillar damage on our untreated Brussels sprout plants.

There were 2 silver Y moths, no diamond-back moths and no turnip moths (2 pheromone traps per species).

Rosemary Collier : 29 Jul 2014 17:48 |  Comments (0) |  Close comments |  Report a problem

Rothamsted suction trap captures for the week ending 20th July

A combination of the hot weather and thundery downpours resulted in little significant aphid flight activity in the week ending 20^th July. In Scotland things are later and aphids remain somewhat more active right across the board. 2014webbulletin16.pdfahdb_aphid_news_20140725.pdf

• Numbers of the peach–potato aphid (Myzus persicae), potato aphid (Macrosiphum euphorbiae) and cabbage aphid (Brevicoryne brassicae) flying are now low everywhere.
• The pea aphid (Acyrthosiphon pisum) has been caught at ten sites with hotspots at Wellesbourne (87), Rothamsted (35) and Writtle (20).
• The black bean aphid, (Aphis fabae), was caught at ten sites and numbers are roughly the same as last week or have started to fall.

Rosemary Collier : 25 Jul 2014 16:03 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Between Tuesday (22nd) and Friday (25th) we found:

• 8 carrot flies on traps in this year's carrots (3 traps) (it really looks as if some of the population are aestivating due to the hot weather)
• Total of 87 cabbage root fly eggs from around 15 cauliflower plants.
• There was 1 silver Y moth, no diamond-back moths and no turnip moths (2 traps per species).

The 3 yellow water traps caught:

• 3 male and 30 female cabbage root flies
• 20 bean seed flies
• 6 pollen beetles
• 38 flea beetles
• 2 cabbage stem weevils
• 1 small white butterfly

Rosemary Collier : 25 Jul 2014 15:56 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Between Friday (18th) and Tuesday (22nd) we captured:

• 13 carrot flies on traps in this year's crop of carrots (3 traps).
• Carrot fly numbers have not increased as 'expected' and it may be that the recent hot weather has caused at least some of the population to aestivate in the pupal stage. A similar thing happened at this time last year and although we captured low numbers of flies over an extended period, damage was high when we harvested our trials in the early autumn.

We collected a total of 82 cabbage root fly eggs from around our 15 newly-planted cauliflower plants.

The 3 yellow water traps caught:

2 male and 34 female cabbage root flies

• 15 bean seed flies
• 8 pollen beetles
• 76 flea beetles
• 4 cabbage stem weevils

There were no silver Y moths, 1 diamond-back moth and no turnip moths (2 pheromone traps per species).

Some potted brassica plants in an experiment belonging to one of our MSc students has been heavily damaged by adult cabbage stem weevils - see below.

Rosemary Collier : 23 Jul 2014 10:07 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Between Monday (14th) and Friday (18th) we found:

• 23 carrot flies on traps in this year's carrots (3 traps)
• Total of 167 cabbage root fly eggs from around 15 cauliflower plants.
• There was 1 diamond-back moth, no silver Y moths and no turnip moths (2 traps per species).

The 3 yellow water traps caught:

3 male and 67 female cabbage root flies

• 16 bean seed flies
• 6 pollen beetles
• 42 flea beetles
• 3 cabbage stem weevils

Rosemary Collier : 18 Jul 2014 17:22 |  Comments (0) |  Close comments |  Report a problem

Rothamsted suction trap captures for week ending 13 July

In the week ending 13^th July, aphid flight activity, as monitored by the suction-traps, continued to decline slowly in England, with the exception of the grain aphid coming off ripening cereals. In Scotland things were somewhat more active right across the board.

• Numbers of the peach–potato aphid (Myzus persicae) fell almost everywhere this week.

• The potato aphid (Macrosiphum euphorbiae) was caught in low numbers at four sites.

• The pea aphid (Acyrthosiphon pisum) has been caught at ten sites with hotspots at Writtle (64) and Dundee (23).

• The mealy cabbage aphid (Brevicoryne brassicae) was caught at eight sites in low numbers.

• The black bean aphid, (Aphis fabae), was caught at ten sites and numbers are generally increasing with a hotspot at Writtle (33).

• The currant-lettuce aphid (Nasonovia ribisnigrii) was caught in low numbers at 3 sites (maximum 3 at Elgin).
• The willow carrot aphid was caught at eight sites this week, with numbers low everywhere.

2014webbulletin15.pdfahdb_aphid_news_20140718.pdf

Rosemary Collier : 18 Jul 2014 17:02 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Between Friday (11th) and Monday (14th) we captured:

• 7 carrot flies on traps in this year's crop of carrots (3 traps)

We collected a total of 125 cabbage root fly eggs from around our 15 newly-planted cauliflower plants.

The 3 yellow water traps caught:

8 male and 79 female cabbage root flies

• 5 bean seed flies
• 8 pollen beetles
• 55 flea beetles
• 3 cabbage stem weevils

There were no silver Y moths, diamond-back moths or turnip moths (2 pheromone traps per species).

Rosemary Collier : 14 Jul 2014 17:04 |  Comments (0) |  Close comments |  Report a problem

Onion thrips and leek moth

Things are just starting to happen on our leek trial (for the SCEPTRE project) and we have spotted damage by thrips and leek moth.

Leek moth damage is shown below:

Rosemary Collier : 14 Jul 2014 13:45 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Between Tuesday (8th) and Friday (11th) we found:

• 18 carrot flies on traps in this year's carrots (3 traps)

In the 3 water traps in the 'new' cauliflower plot:

• 4 male and 62 female cabbage root flies
• 14 bean seed flies
• 11 pollen beetles
• 53 flea beetles
• 4 cabbage stem weevil

We collected a total of 25 cabbage root fly eggs from around 15 cauliflower plants.

There were no diamond-back moths, no silver Y moths and 2 turnip moths (2 traps per species).

Rosemary Collier : 12 Jul 2014 19:11 |  Comments (0) |  Close comments |  Report a problem

Rothamsted suction trap captures – week ending 6 July

The most recent bulletin has just been released.

Generally aphid flight activity as monitored by the suction-traps was down this week, with the exception of the cereal aphids.

• Numbers of the peach–potato aphid (Myzus persicae) fell almost everywhere this week, with just a minor hotspot persisting at Wellesbourne.

• The potato aphid (Macrosiphum euphorbiae) was caught in low numbers at seven sites.

• The pea aphid (Acyrthosiphon pisum) has been caught at nine sites with a hotspot at Wellesbourne. Field reports indicate colonies present in many pea and bean crops.

• The cabbage aphid (Brevicoryne brassicae) was caught at eight sites in central and southern England.

• The black bean aphid, (Aphis fabae), was caught in nine suction-traps this bulletin week with a hotspot at Writtle (13).

• The currant-lettuce aphid (Nasonovia ribisnigri) was caught at 4 sites in low numbers.

• Numbers of willow-carrot aphid (Cavariella aegopodii) are low.

2014webbulletin14.pdf

ahdb_aphid_news_20140711.pdf

Rosemary Collier : 11 Jul 2014 20:36 |  Comments (0) |  Close comments |  Report a problem