All entries for May 2014

Pest update from Wellesbourne

Between Tuesday (27th) and Friday (30th) we found:

• 73 carrot flies on traps in this year's carrots (3 traps)
• 6 winged willow-carrot aphids on 3 x 0.5 m lengths of carrot row (29 May)

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

• 1 male and 12 female cabbage root flies
• 53 bean seed flies
• 11 pollen beetles
• 1 flea beetle

We collected a total of 15 cabbage root fly eggs from around 15 cauliflower plants (planted 15 April).

There were no diamond-back or silver Y moths, but we caught two turnip moths (cutworm).

Rosemary Collier : 31 May 2014 11:21 |  Comments (0) |  Close comments |  Report a problem

Rothamsted suction trap samples for the week ending 25th May

Aphid flight activity continued in between the showers. Temperatures were about average for the time of year, so aphid numbers on the ground have the potential to increase.

• Numbers of peach–potato aphid (Myzus persicae) have increased in the west midlands and south west England, and remain high in the east, but none yet north of the border.

• The potato aphid (Macrosiphum euphorbiae) was caught across the Country in low numbers.

• The pea aphid (Acyrthosiphon pisum) was caught at six sites in low number.

• The cabbage aphid (Brevicoryne brassicae) was caught at five sites in low numbers

• The willow carrot aphid (Cavariella aegopodii) migration continued, with highest numbers at Preston and Kirton.

• One black bean aphid (Aphis fabae) was caught at Hereford.

• The currant lettuce aphid (Nasonovia ribisnigri) was caught in low numbers at 3 sites.

Rosemary Collier : 30 May 2014 16:09 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Between Friday (23rd) and Tuesday (27th) we captured:

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

We collected a total of 54 cabbage root fly eggs from around 15 cauliflower plants (planted 15 April). The 3 water traps caught:

• 2 male and 13 female cabbage root flies
• 58 bean seed flies
• 1 pollen beetle
• 9 flea beetles

There were no diamond-back moths or silver Y moths and 10 turnip moths (cutworms) (2 pheromone traps per species).

Rosemary Collier : 28 May 2014 22:12 |  Comments (0) |  Close comments |  Report a problem

Large narcissus fly forecast update

The updated forecast for large narcissus fly is here: narcissus_fly_template_23_may_2014.pdf

Rosemary Collier : 24 May 2014 14:57 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Between Tuesday (20th) and Friday (23rd) we found:

• 226 carrot flies on traps in this year's carrots (3 traps)
• 1 winged willow-carrot aphid on 3 x 0.5 m lengths of carrot row (21 May)

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

• 2 male and 15 female cabbage root flies
• 42 bean seed flies
• 32 pollen beetles
• 72 flea beetles - these have increased in number since the last sample was taken
• 4 cabbage stem weevils - also an increase in numbers

We collected a total of 76 cabbage root fly eggs from around 15 cauliflower plants (planted 15 April).

There were no diamond-back or silver Y moths, but we caught one turnip moth (cutworm) the first of the year!

Rosemary Collier : 24 May 2014 11:45 |  Comments (0) |  Close comments |  Report a problem

Rothamsted suction trap samples for the week ending 18 May

Information on captures during the week ending 18 May has been released.

Aphid flight activity rose significantly as the weather warmed up, with both total numbers and diversity increasing this week. Aphid natural enemies are also increasing, particularly ladybirds.

• Numbers of peach–potato aphid (Myzus persicae) have increased dramatically this week, particularly in eastern and south eastern England, but none yet at Newcastle or north of the border.
• The potato aphid (Macrosiphum euphorbiae) was caught across the country in low numbers.
• The pea aphid (Acyrthosiphon pisum) was caught at eleven sites this week, with numbers highest in eastern England.
• The cabbage aphid (Brevicoryne brassicae) was caught at five sites this week in low numbers
• The willow carrot aphid (Cavariella aegopodii) migration increased substantially this week, with highest numbers at Kirton and Broom’s Barn.
• The currant-lettuce aphid (Nasonovia ribisnigri) was caught at 3 sites.
• The black bean aphid (Aphis fabae) was caught at 2 sites.
  

Rosemary Collier : 24 May 2014 09:07 |  Comments (0) |  Close comments |  Report a problem

Pest update

Between Friday (16th) and Tuesday (20th) we captured:

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

We collected a total of 70 cabbage root fly eggs from around 15 cauliflower plants (planted 15 April). The 3 water traps caught:

• 12 male and 26 female cabbage root flies
• 25 bean seed flies
• 44 pollen beetles
• 48 flea beetles
• 13 cabbage stem weevils

There were no diamond-back or silver Y moths.

Rosemary Collier : 20 May 2014 18:37 |  Comments (0) |  Close comments |  Report a problem

Pest update from Wellesbourne

Between Tuesday (13th) and Friday (16th) we found:

• a whopping 1174 carrot flies on traps in this year's carrots (3 traps) (see yesterday's blog)
• 10 winged and 2 wingless willow-carrot aphids on 3 x 0.5 m lengths of carrot row

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

• 24 male and 36 female cabbage root flies
• 110 bean seed flies
• 26 pollen beetles
• 25 flea beetles - these have increased in number since the last sample was taken
• 9 cabbage stem weevils - also an increase in numbers

We collected a total of 184 cabbage root fly eggs from around 15 cauliflower plants (planted 15 April).

There were no diamond-back or silver Y moths

We have pheromone traps out for European tarnished plant bug and common green capsid - and caught 1 European tarnished plant bug.

Rosemary Collier : 16 May 2014 15:31 |  Comments (0) |  Close comments |  Report a problem

Rothamsted suction trap samples for the week ending 11 May

The 6th issue of AHDB Aphid News has just been released.

Aphid flight activity decreased temporarily this week because of a period of adverse weather, but is sure to be picking up soon. This is still looking like an early, large start to the aphid season.

• The peach–potato aphid (Myzus persicae) was caught at five sites. Field reports of this species on untreated sugar beet and on baby leaf brassicas were received from eastern England.

• Two potato aphids (Macrosiphum euphorbiae) were caught, including a first arrival at Preston.

• Two pea aphids (Acyrthosiphon pisum) were caught at Elgin but none elsewhere this week.

• No cabbage aphids (Brevicoryne brassicae) were found in the UK traps this week, but a field report from eastern England of large numbers on game cover kale was received.

• The willow carrot aphid (Cavariella aegopodii) was caught at six sites in low numbers.
• One currant lettuce aphid (Nasonovia ribisnigri) was caught at Writtle - the first of the year.

Rosemary Collier : 16 May 2014 15:09 |  Comments (0) |  Close comments |  Report a problem

Large narcissus fly forecast

Narcissus fly emergence is likely to start soon in the south-west and central and eastern England:

Once they have emerged, adult large narcissus flies need warm sunny days to mate and lay their eggs. Provided these conditions occur, egg laying will start 4-5 days after emergence at the earliest. Mating, and therefore egg-laying, will be delayed if air temperatures are lower than the activity threshold, which is close to 20^oC. The period between egg-laying and egg hatching, after which the larvae invade bulbs, will be about 9-11 days depending on temperatures.

Rosemary Collier : 15 May 2014 22:19 |  Comments (0) |  Close comments |  Report a problem