Powder dery y Mildew Mildew Cur Curativ tive e Trial rial - PowerPoint PPT Presentation

Powder dery y Mildew Mildew Cur Curativ tive e Trial rial 2014 2014 Presented by: Chris Herries,

OP’s / Carbar Carbaryl ( yl (June 2013) une 2013)

Wha hat ar t are g e grower ers s using using Cabrio + Spreadwet Lime Sulphur 1% Citrox (0.5%) Lime Sulphur 3% Citrox (1.5%) Nimbus (sulphur) + Protector Nordox (copper) + Nimbus (sulphur) + Citrox (1%) + Sulphur Protector 0.5% 100% leaf removed from fruit zone Nordox (copper) + Protector 0.5% Control Nordox Copper Excel Oil 2% Pendant + Nimbus (sulphur) + Spreadwett Excel Oil Plus 2% Pendant + Spreadwet HML32 + Nordox Phosgard HML32 + Potassium Bicarb + Nimbus (sulphur) Phosphoric Acid + Molassas HML32 + Potassium Bicarb + Nordox Potassium Bicarb + Spreadwet Teracep Pristine + Spreadwet JMS Stylet Oil (1%) + Duwet Prostar + Spreadwet JMS Stylet Oil 2% Proxima + Spreadwet

Applica pplications tions day 0 day 7 day 14 day 21 20 th Jan 27 th Jan 3 rd Feb 10 th Feb Assess trial 1 st application 2 nd application Photo’s taken made made All applications made with high water rate to the point of run off (1000lt/Ha)

Co Cover erage ge (E (Excel cel oil) oil) Front of Bunch Back of Bunch

Leaf Leaf Scor Score Ef e Effect ect 0 10 Phosgard HML32 + Pot Bicarb + Nordox

Ber Berry S y Scor core Ef e Effect ect 0 10 Cabrio + Spreadwet Excel Oil Plus

Nor Nordo dox

Nor Nordo dox

Results esults

HML3 HML32 + P 2 + Pot ot Bica Bicarb rb + Nor + Nordo dox

HML3 HML32 + P 2 + Pot ot Bica Bicarb rb + Nor + Nordo dox

Con Contr trol ol

Con Contr trol ol

Con Contr trol ol

Wetta ettable ble Sulphur Sulphur + Pr + Protec otector tor

Should no Should not be u t be used a sed as cur s curativ tive Pendant (Penconazole)

Should no Should not be u t be used a sed as cur s curativ tive Prostar Proxima (Myclobutanil) (Quinoxyfen)

Should no Should not be u t be used a sed as cur s curativ tive Cabrio Pristine (Pyraclostrobin) (Boscalid + Pyraclostrobin)

Cur Curativ tive Trial R rial Results esults Leaf Control Berry Control 10 9 8 7 6 5 4 3 2 1 0 Yellow indicates do not use curative use as a protectant only

Con Conclusion lusion • good curative chemistry – Oils (Excel oil, Excel Plus oil, JMS Stylet oil) – HML32 (in particular mixed with Potassium Bicarbonate and Nordox) – Nordox (label claim for powdery mildew control) • Do not over use chemistry prone to resistance, always use as protectants and minimize use under high disease pressure.

Con Conclusion lusion • Coverage is essential the best curative will not work if it has not reached the target. Poor coverage just allows surviving spores to reinfect treated tissue • Understand the differences of curative and protectant chemistries, and target to what you are trying to achieve.

Inf Infectio ection timing n timing Level of infection risk dependent on Overwintering overwintering inoculant from Powdery mycelium causing flag-shoot infection Mildew infection pervious season. Use curative chemistry to prevent Powdery Cleistothecia releasing ascospores ? Mildew establishment to land on susceptible tissue causing infection Powdery Mildew infections producing conidial spores and infecting susceptible tissue (flowers, berries, leaves, soft cane tissue) Providing protection preventing new Sexual stage Cleistothecia production infections. Use a curative if infections are present to stop further infection and cleistothecia production You are buggered need to have tight preventative program next spring

Timing is critical Timing is critical Too late for Critical period to prevent over- Protectants must be prevention. If present wintering Ascospores or maintained to prevent use a curative to try mycelium from establishment conidial spores from and reduce the and then producing conidial establishment on leaf, flowers production of which can then spread to and berries cleistothecia for next flowers and berries season Critical Important Too late

Right pr Right products oducts at right time t right time Curative only if Protectant Protectant Protectant Protectant Protectant Protectant Protectant Curative Curative Curative Curative required to reduce cleistothecia production Curative Protectant Lime Sulphur Wettable Sulphur – Sulclean, Nimbus HML32 Penconazole – Topas, Pendant Nordox Pristine Oil’s - Excel Oil, Excel plus, JMS Quinoxyfin – Proxima -Qintec

Winter inter – Fla lag sho g shoot de ot developme elopment nt Flag shoot Winter Advanced bud development No green tissue swell Critical timing for nil risk of Critical timing for curative spray infection no curative spray spraying required Lime Sulphur Lime Sulphur OR OR Excel Oil Excel Oil

Powdery Mildew in Organic’s • 2013 – 2014 organic vineyards maintained good levels of powdery control. • Plenty of chemistry available to maintain good control of powdery mildew. – Lime Sulphur – Wettable Sulphur – HML32 – Nordox – Excel Oil – Protector – Potassium Bicarbonate