Cutworms

We still haven’t captured any male turnip moths in our pheromone traps at Wellesbourne. Several years ago, data on trap captures in 2005-7 were used to estimate a day-degree sum for the start of flight activity. This was 340 D^o above a base of 7^oC. The graph below shows accumulated day-degrees for these 3 years compared with accumulated day-degrees to date for 2013 (lower line in black) and shows that this year we have not hit 340 D^o yet, so perhaps shouldn’t be expecting to catch moths. This is yet another indication of the impact of a very cold spring.

In future weeks, output from the turnip moth forecast model will be found here: http://www3.syngenta.com/country/uk/en/AgronomyTools/HDCPestBulletin/Pages/HDCPestBulletin.aspx

Rosemary Collier : 30 May 2013 11:20 |  Comments (0) |  Report a problem