All entries for Saturday 27 July 2019
July 27, 2019
- Peach–potato aphid numbers have decreased to half of the previous week. A hotspot at Dundee remains but numbers are declining.
- Potato aphid numbers have decreased to 60% of last week, increasing at only three sites.
- Cabbage aphid numbers also declined to two thirds of last week, with a further decline in the hotspot at Writtle.
- Single currant–lettuce aphids were captured at Writtle and Starcross.
- Willow–carrot aphid numbers decreased to a quarter of last week, increasing at only Silwood Park and Starcross.
- Pea aphid numbers decreased to around 20% of last week, increasing at only Newcastle.
- Total numbers of black bean aphids have decreased to around 40% of last week. There was, however, an increase at York and a hotspot at Starcross.
When the water traps in the swede plot were checked yesterday there were:
- 10 male and 54 female cabbage root flies
- 61 bean seed flies
- 28 flea beetles
- 453 pollen beetles
- 92 cabbage stem weevils
- 270 cabbage stem flea beetles
- 0 cabbage seed weevils
There were 360 carrot flies on the 3 sticky traps in the new plot for 2019.
122 cabbage root fly eggs were laid between 23 and 26 July (around 15 plants).
2 diamond-back moths, no turnip moths, no silver Y moths and no cabbage moths were captured in pheromone traps. There are 2 traps for each species.
We also caught 4 diamond-back moths on 5 carrot fly traps.