Winter cereals WINTER wheat crops are now rapidly reaching GS 31 and winter barleys are at GS 31 in most cases. PGRís will be required now on all crops at risk of lodging.
Beware overnight frosts when spraying, especially when applying mixtures of products. Ensure doses of herbicide are adequate when spraying over-wintered weeds.
Septoria is very obvious in wheat crops and there are reports of yellow rust infections developing on susceptible varieties in those areas where it was seen last year. Autumn/winter conditions were suitable for eyespot infection and all crops at risk should be checked now. Rhynchosporium is easily found in winter barleys and brown rust is reported on susceptible varieties.
Continue to monitor wheat and barley crops for all diseases and plan appropriate treatments. Plan fungicide programmes taking into account the new FRAC strobilurin guidelines and consult your Distributor before using products containing tridemorph.
Oilseed rape AS crops move into green and yellow bud, check for pollen beetle. Spray if numbers reach an average of more than 15 per plant. On backward crops the threshold for treatment is 5 per plant. Once crops are flowering spraying for this pest is no longer justified.
Field beans NOTCHING caused by pea and bean weevils can be found on many winter bean crops but generally at levels below those which justify spraying except on very late emerging crops. Spring beans are more susceptible and should be monitored as they emerge.
Information supplied by: Profarma Limited, Cambridge House, Nottingham Road, Stapleford, Nottingham, NG9 8AB