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) |  Report a problem