All entries for Thursday 15 May 2014

Large narcissus fly forecast

Narcissus fly emergence is likely to start soon in the south-west and central and eastern England:

Once they have emerged, adult large narcissus flies need warm sunny days to mate and lay their eggs. Provided these conditions occur, egg laying will start 4-5 days after emergence at the earliest. Mating, and therefore egg-laying, will be delayed if air temperatures are lower than the activity threshold, which is close to 20^oC. The period between egg-laying and egg hatching, after which the larvae invade bulbs, will be about 9-11 days depending on temperatures.

Rosemary Collier : 15 May 2014 22:19 |  Comments (0) |  Close comments |  Report a problem

Abundant carrot flies at Warwick Crop Centre

Carrot flies on one of the Wellesbourne traps today! There were 1174 carrot flies in total on our 3 traps.

Rosemary Collier : 15 May 2014 20:19 |  Comments (0) |  Close comments |  Report a problem