All entries for Friday 16 June 2017
June 16, 2017
AHDB Aphid News
The latest edition of AHDB Aphid News has just been published - for the week ending 11th June.
The wet and very windy weather in the week ending 11th June greatly restricted aphid flight, with numbers in the traps falling dramatically. Disruption on the ground will have been much less pronounced and aphid populations already in crops will be multiplying as conditions improve. Reports of predators and parasitoids are now coming in. Monitoring crops is strongly advised.
- The peach–potato aphid (Myzus persicae) numbers fell this week, with highest numbers in the ST (suction trap) at York. Tests continue show that 60-70% of these migrants are carrying Turnip yellows virus.
- The mealy cabbage aphid was caught in both ST and YWT (yellow water trap) in low numbers and it has also been reported from some OSR crops in several counties across southern England.
- No currant-lettuce aphids (Nasonovia ribisnigri) were caught in the ST this week.
- Numbers of the willow–carrot aphid and the parsnip aphids have all substantially declined this week.
Rosemary Collier
16 Jun 2017 15:43
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Pest update from Wellesbourne
Between Tuesday and today we caught:
On 3 sticky traps in each of our carrot plots:
- 7 carrot flies - overwintered carrots
- 33 carrot flies - spring-sown carrots
In 3 water traps in a plot of swedes and 1 trap near oil seed rape.
- 43 male cabbage root flies and 14 females
- 36 bean seed flies
- 1112 pollen beetles
- 61 flea beetles
- 47 cabbage stem weevils
- 4 cabbage seed weevil
- 6 cabbage stem flea beetles
We also recovered 0 cabbage root fly eggs from the soil around 15 cauliflower plants.
We caught 1 silver Y moth and 2 turnip moths (2 traps per species) in our pheromone traps.
We have also caged some areas planted with narcissus in order to record emergence of large narcissus fly - none caught today!
Rosemary Collier
16 Jun 2017 15:19
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