TMMF Ltd
Farminguk
29 May 2016 | Online since 2003
Scrutton Bland


23 April 2014 04:31:50|

Super-early OSR brings forward the Sclerotinia risk


According to Dr Caroline Young from ADAS, this year's oilseed rape crops are up to a month ahead of the same time last year, with some plants flowering super-early.
The advanced crop state is borne of the recent unseasonably warm weather, Dr Young suggests, and accompanying it is a significantly earlier Sclerotinia risk compared to spring 2013.
Dr Young says: "The map colours indicate how close we are to the expected appearance of the Sclerotinia fungal fruiting bodies (an apothecium).”
“Red areas on the map indicate that apothecia are already present, or expected to appear imminently. This is in stark contrast to what was seen even as late as May last year.” In general the South West of England warms up first and the North East the latest. So, apothecia tend to be seen earliest in the South West, and latest in the North. The colour map broadly reflects this. However there will be variation with local topography and conditions."
She recommends that growers in all areas need to review their crop risk and plan their fungicide strategies accordingly.
“Most areas on the predictive map are now red, which agrees with what we are observing at BASF’s Sclerotinia monitoring sites, where germination has now started in all depots.”
“Any crops at early or mid-flower, which are in red areas, should be considered at risk from infection and it is likely that foliar fungicide applications now may be justified. Crops in the remaining orange areas will also be at risk shortly, so fungicide treatment now will also be beneficial, assuming a three week protection window for fungicides, under normal conditions.“
“Crops at late flower may also benefit from fungicide treatment; they are still at risk, but late infection tends to affect more of the lateral branches and therefore not be so damaging to yield as infection that occurs early and affects the main stems."
She adds that if lodging occurs however, infection occurring at any flowering phase can then spread rapidly through a crop by plant to plant spread.
In terms of timing, she advises that the main difference for growers this year, compared with 2013, is the calendar dates for early flower fungicide applications - growers will need to be applying fungicides now, or have already applied them, rather than the more usual time of later in April or into May.
“The usual guidelines for fungicide timing according to susceptible crop stage (open flowers), inoculum risk (sclerotial germination observations and predictions, and/or petal tests) and weather conditions (warm, light rain) will still apply.“
“However 2014 conditions have seen fungicides being applied earlier, where, if no other guidelines are taken into account, oilseed rape flowering began early and continues to progress earlier than in most years. Flowering onset is variable from year to year, but, for example in most years, ADAS Herefordshire trial sites have reached yellow bud in early- to mid-April.“
BASF's Sarah Mountford-Smith recommends that for applications targeted at Sclerotinia, growers should use Filan (boscalid) at 0.3-0.5 kg/ha, applied ideally before petal fall. "Both Filan and prothioconazole-based fungicides give excellent control of Sclerotinia, but, importantly, HGCA trials have shown that Filan consistently contributes a yield increase in the absence of disease.”
“It is also a different mode of action for resistance management of Light Leaf Spot, at a time when triazole resistant strains of Light Leaf Spot exist, and since spores will still be present in the crop. And finally, Filan is 'Bee-safe'; it can be mixed with pyrethroids for seed weevil control at flowering when bees are not foraging."

Download





0 Comment


loginuserlogo
Name

Please enter your name


Email

Comment

Please enter your comment


Post Comment

Your comment submitted successfully.Please wait for admin approval.


Comments

No comments posted yet. Be the first to post a comment

World News

Canada | 27 May 2016
Southern Ontario farmers launch their own weather network

Southern Ontario farmers are building their own weather network to more accurately record how conditions will affect their crops. The AG Grower Daily Dashboard project is designed to give farmers h...


Australia | 27 May 2016
National Australia sees farmers seeking loans to weather crisis

National Australia Bank Ltd., the nation’s largest lender to farmers, is expecting its dairy clients to seek short-term credit to assist them as slumping milk prices have thrown the industry into a cr...


USA | 27 May 2016
Central Indiana county approves livestock farm restrictions

A central Indiana county has approved new restrictions on big livestock farms limiting where those farms with hundreds or thousands of animals can be built. The ordinance approved this week by the ...


Ireland | 27 May 2016
Dairy farmers' income plight in spotlight

IFA president Joe Healy, who met with EU Agriculture Commissioner Phil Hogan in Brussels, said the majority of dairy farms will be in the red this month. He urged the Commissioner to act without de...


Canada | 27 May 2016
The changing face of Canada's farm industry

Mapping the evolution of Canada's farm industry is not as simple as just examining the numbers. Every five years, Canada's federal government asks us to provide details on who lives in our househol...



Trending Now

Viewed
Discussed

Farms and Land for sale

PropertyLocation
PropertyAgent
PropertyMinimumPrice
PropertyMaximumPrice
PropertyCategory

Holiday Rentals search

AccommodationKeyword
AccommodationType
AccommodationCounty
AccommodationStarRating


Top stories you may have missed
closeicon
Username
Password