All entries for Friday 21 June 2019
June 21, 2019
- Peach–potato aphids decreased to half of that of last week, but with numbers still rising at sites in Northern Britain, as well as at Starcross.
- Potato aphid numbers also halved across much of Britain, apart from Dundee, Newcastle and Kirton
- Cabbage aphid numbers increased at five sites, but total numbers are down to a third of last week.
- Single currant–lettuce aphids were captured at Rothamsted and Starcross.
- Willow–carrot aphid numbers declined to around 40% of last week across all sites, except Starcross
- Pea aphid numbers increased at seven sites, reaching double figures at three.
- Black bean aphid numbers have increased substantially at seven sites, with a hotspot at Silwood Park.
When the water traps in the swede plot were checked today there were:
- 4 male and 3 female cabbage root flies
- 25 bean seed flies
- 0 flea beetles
- 3650 pollen beetles
- 25 cabbage stem weevils
- 0 cabbage stem flea beetles
- 0 cabbage seed weevils
There were 15 carrot flies on the 3 sticky traps in the new plot for 2019.
59 cabbage root fly eggs were laid between 18 and 21 June (around 15 plants).
6 diamond-back moths and 1 turnip moth were captured. No moths were captured in our other pheromone traps (silver Y moth, cabbage moth, diamond-back moth). There are 2 traps for each species.
We also caught 12 diamond-back moths on 6 carrot fly traps, 3 of which are in our carrots (above) and 3 are in the swede plot and are baited with a pheromone lure (experimental).