The warm, sunny Easter holiday turned nearly all the met stations on themigration start map red; all eyes should now turn to the new migration map,reports Bayer CropScience.
Up to last Friday the migration start map had been in stasis for afortnight with almost half the met stations red and half green. Easter Sundayand Mondays fine weather turned all but five of the remaining met stations redso 95 percent of them are now showing migration started. The five remainingstations situated in Norfolk and Suffolk are yellow indicating migration due tostart within the next few days.
Rothamsted Researchs Dr Sam Cook says this means its now time forgrowers to turn their attention to the new migration map. When your nearest met station has beenyellow (good migration conditions) for three consecutive days or red (optimummigration conditions) for just one day, its the prompt to get into crops andassess average numbers of beetles per plant against thresholds.
Following a veryslow start to migration the outlook now is for a fast finish. On the percentmigration map the most advanced met stations are showing 21 percent migrationand much of the country has 90 percent still to come. Meanwhile BBC weather isforecasting, for the vast majority, several days of fine weather to come withtemperatures up into the mid to high teens.
Dr Cook saysthis would be ideal for pollen beetle migration and could be sufficient to seemigration completed en masse in a matter of days while crops are still growingthrough the damage susceptible green to yellow bud phase.
Access pollenbeetle predictor at: www.bayercropscience.co.uk/pollenbeetlepredictor