Managing Late Blight in 2011 SSPGA/SVGA 2010 2010

Managing Late Blight in 2011 SSPGA/SVGA 2010 2010 Late Blight widespread across N. America Arrives in SK in July

Commercial growers (SVGA, SSPGA, SGGA) warned in advance Backyard tomatoes wiped out. Ghse = ?? Potatoes mixed bag Why so much Late Blight in 2010?

Why so much Late Blight in 2010? 2009 - blight arrives across SK late in the season - causes minor crop loss but did it get into the seed potatoes?

Why so much Late Blight in 2010? 2010 - ideal weather for development and spread of blight (cool, windy and wet) - very difficult to maintain a decent spray program

So, what about 2011? So, what about Blight in 2011 ? Pathogen - Late blight overwinters in infected tubers - Disease spreads into next year if .... a) diseased tubers discarded as

culls are not disposed of correctly b) diseased tubers used as seed So, what about Blight in 2011 ? Pathogen Diseased seed - heavily infected tubers ...

- easy to detect - will likely rot after planting = no spread - may spread spores to otherwise healthy seed at cutting time So, what about Blight in 2011 ?

Pathogen Diseased seed - Lightly infected tubers ... - infected late in fall or at cutting time - no visible signs of rot - will likely sprout and develop into diseased plant = starting point of field

infection Al-Mughrabi - 2010 So, what about Blight in 2011 ? Managing the Pathogen - Plant certified seed ... but Late Blight is

not specifically covered in Certification Standards - Ask your supplier about Blight pressure and their blight management program - Grow out test results ? - Check the seed carefully yourself

So, what about Blight in 2011 ? Managing the Pathogen - Blight bioassay - randomly select 50 (100 ?) tubers - cut + hold at 20oC at high RH for 2 weeks - look for Late Blight sporulation (3

days So, what about Blight in 2011 ? Managing the Pathogen Standard conditions for curing cut seed = ideal for sporulation of Blight CUT... then PLANT

Disinfect cutting, handling equipment regularly Cut problem seed lots last So, what about Blight in 2011 ? Managing the Pathogen - need to stop infected seed from sporulating and infecting adjacent

healthy pieces - grade out any diseased pieces - apply seed piece treatments immediately after cutting Immediate application of seed treatments both stops infection

and prevents spore formation So, what about Blight in 2011 ? Managing the Pathogen Seedpiece treatments Poor Easout and Maxim Good Tuberseal, PST, Maxim MZ

Evolve = TBZ + MZ + cymoxanil Seed Piece Treatments Work !! So, what about Blight in 2011 ? Environment - Avoid high risk fields in 2011

- low spots - problem access fields - proximity to problems - Pay attention to weather at emergence - Whats going on next door ?

So, what about Blight in 2011 ? Managing the Pathogen Scout field at emergence Start preventative spray program early High risk fields .... - curzate MZ at 80% emergence, then again 2 weeks later

So, what about Blight in 2011 ? Host - Cultivar sensitivity Sensitive all reds, Shepody Moderate Norkotah, Burbank, Yukon Gold Tough Alpine, Classic, Milva, Yukon Gem

Shepody Y. Gold Burbank Milva

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