OSR crops are now flowering in earnest and mostly past the risk of pollen beetle damage, reports Bayer.
The Bayer Pollen Beetle Predictor per cent migration map is showing a clear north-south divide in pollen beetle migration this season. Met stations inEngland now range from ten to 50% complete with migration most advanced in the southern counties. There has been hardly any movement in Scotland over the last week where met stations still sit at eight to 19% migration.
Rothamsted researcher Dr Sam Cook says: Reports back from all 19 trapping volunteers in the pollen beetle IPM project are that their crops have reached the end of the damage susceptible period marked by BBCH 61 thresholds have not been breached and none have had to spray.
However,any grower with a backward crop should keep an eye on it as pollen beetle are now easy to find in the tens to twentys per main raceme. While pollen beetle in these numbers do a good job of pollinating flowering plants they can cause damage in crops still passing through the green to yellow bud stage.
As the majority of crops are now home and dry this is the last bulletin for 2016.
To access Bayer Pollen Beetle Predictor click on: http://www.bayercropscience.co.uk/tools-and-services/agronomy-online-tools-and-services/pollen-beetle-predictor