All entries for Thursday 18 April 2013

Pest bulletin currently unavailable

There are some problems with the Syngenta web pages and we apologise for the fact that the pest bulletin is currently unavailable. We hope it will be restored by Monday at the latest.

Rosemary Collier : 18 Apr 2013 17:48 |  Comments (0) |  Close comments |  Report a problem

Pest sitings

Active pollen beetles (in picture) were seen in south-east England on 14 April, the same day they were seen in Gloucestershire (see previous blog). Infestations of thrips have been observed on overwintered onions - also in south-east England.

When we checked our traps at Wellesbourne at the beginning of the week there were a few bean seed flies. We have not captured any carrot flies or cabbage root flies yet.

Rosemary Collier : 18 Apr 2013 17:46 |  Comments (0) |  Close comments |  Report a problem

Updated day–degree graph

Now that it's a bit warmer we're starting to accumulate a few more day-degrees at Wellesbourne. The first graph shows accumulated day-degrees above 0°C. The second graph uses a higher threshold of 4.4°C, which is close to the low temperature threshold for development of many pest species. This emphasises how slowly most pests will have been developing over the last two months or so. Howevcer, the last few days have been much 'better' for pest development!

Rosemary Collier : 18 Apr 2013 17:33 |  Comments (0) |  Close comments |  Report a problem