All entries for Friday 12 July 2019
July 12, 2019
- Peach–potato aphid numbers have decreased to around 38% of the previous week's.
- Potato aphid numbers have also decreased to a third of previous week's.
- There was a hotspot of cabbage aphids at Writtle.
- Two currant–lettuce aphids were captured at York.
- Willow–carrot aphids decreased to just under half of those in the previous week.
- Pea aphid numbers halved compared with the previous week across much of Britain but rose at Dundee.
- Total numbers of black bean aphid have decreased to 44% of those in the previous week, with a substantial reduction inumbers at Wellesbourne and Starcross.
When the water traps in the swede plot were checked today there were:
- 139 male and 50 female cabbage root flies
- 50 bean seed flies
- 9 flea beetles
- 713 pollen beetles
- 51 cabbage stem weevils
- 2 cabbage stem flea beetles
- 1 cabbage seed weevil
There were 59 carrot flies on the 3 sticky traps in the new plot for 2019.
594 cabbage root fly eggs were laid between 9 and 12 July (around 15 plants).
1 diamond-back moth and 1 turnip moth were captured. No moths were captured in our other pheromone traps (silver Y moth, cabbage moth). There are 2 traps for each species.
We also caught 11 diamond-back moths on 5 carrot fly traps.