All entries for July 2013

Aphids on our brassicas

A tour of our plots yesterday showed a recent influx of winged aphids - some Myzus persicae and some Brevicoryne brassicae. There are some small colonies of Brevicoryne brassicae on our swede plot (below).

There are also a few predators about - ladybirds and hover fly larvae (below):

Rosemary Collier : 18 Jul 2013 08:49 |  Comments (0) |  Close comments |  Report a problem

Willow–carrot aphid update from Wellesbourne

The table below shows the total number of willow-carrot aphids on 3 x 0.5 m lengths of row of carrot plants. Numbers of all stages have decreased since last week.

Rosemary Collier : 15 Jul 2013 18:26 |  Comments (0) |  Close comments |  Report a problem

Update from Wellesbourne

Today we found:

• 4 carrot flies (3 traps)
• 5 turnip moths (2 traps)
• 1 diamond-back moth (2 traps)
• 226 cabbage root fly eggs (15 plants) - the second generation is definitely underway now!
• 58 bean seed flies (3 traps)
• 143 pollen beetles (3 traps)
• 2 flea beetles (3 traps)

Rosemary Collier : 15 Jul 2013 18:17 |  Comments (0) |  Close comments |  Report a problem

Rothamsted suction trap captures for week ending 7 July

Writing about web page http://www.rothamsted.ac.uk/insect-survey/Bulletins/2013WebBulletin11.pdf

The latest Bulletin has now been released.

This document provides more detailed information on the pest aphids of vegetable crops aphid_news20130712.pdf.

In summary:

Willow–carrot aphid numbers have increased again in seven suction traps and are above the ten year means for this time of year. Accumulated numbers for 2013 at Hereford and Starcross are also above the ten year means.

Peach–potato aphid suction trap numbers are now slowly increasing, with a hotspot at Broom’s Barn. Numbers of both peach–potato aphid and potato aphid are low for the time of year.

Yellow water trays placed by Broom’s Barn at twenty eight sites in sugar beet areas caught 25 peach–potato aphids and no potato aphids during the period 3/7–9/7.

Currant–lettuce aphids and cabbage aphids were both caught at three sites this week in low numbers.

Pea aphids and black bean aphids were caught throughout the Country in low numbers.

There are field reports of peach–potato aphids, potato aphids, pea aphids and black bean aphids present in small colonies in sugar beet, potatoes, cabbage, peas and beans, but numbers are low despite the warm weather. Alongside these aphid reports are reports of increasing populations of natural enemies, particularly hoverflies and aphid parasitoids.

Rosemary Collier : 13 Jul 2013 07:06 |  Comments (0) |  Close comments |  Report a problem

Wellesbourne update

Today we found:

• 18 carrot flies (3 traps)
• 47 cabbage root fly eggs (15 plants) - the second generation is starting
• 14 bean seed flies (3 traps)
• 7 pollen beetles (3 traps)
• 6 turnip moths (2 traps)

Rosemary Collier : 11 Jul 2013 22:16 |  Comments (0) |  Close comments |  Report a problem

Willow–carrot aphid at Wellesbourne

The willow-carrot aphids on our carrot plot at Wellesbourne are now becoming more heavily-parasitised:

Counts are on 3 x 0.5 m lengths of row.

Rosemary Collier : 10 Jul 2013 07:51 |  Comments (0) |  Close comments |  Report a problem

Wellesbourne update

Today we found:

• 33 carrot flies (3 traps)
• 27 cabbage root fly eggs (15 plants)
• 22 bean seed flies, 19 pollen beetles and 1 brassica flea beetle (3 traps)
• 7 turnip moths (2 traps)
• 1 silver Y moth (2 traps)

Rosemary Collier : 08 Jul 2013 20:04 |  Comments (0) |  Close comments |  Report a problem

Rothamsted suction trap captures

An updated summary of Rothamsted suction trap captures up to 30th June has just been released: bulletin_10_2013.pdf.

More detailed information about the pest aphids of vegetable crops is here:

aphid_news20130705.pdf

Rosemary Collier : 05 Jul 2013 15:49 |  Comments (0) |  Close comments |  Report a problem

Pest update Wellesbourne

Today we found:

• 18 carrot fly (3 traps)
• 4 cabbage root fly eggs (15 plants)
• 1 turnip moth (2 traps)
• 3 silver Y moths (2 traps)
• 1 diamond-back moth (2 traps)
• 23 bean seed flies (3 traps)
• 3 pollen beetles (3 traps)

Rosemary Collier : 04 Jul 2013 15:55 |  Comments (0) |  Close comments |  Report a problem

Willow carrot aphid counts

Marian counted the willow-carrot aphids on 3 x 0.5m lengths of carrot row. All of the counts to date are shown below:

Rosemary Collier : 02 Jul 2013 18:15 |  Comments (0) |  Close comments |  Report a problem