Powdery Mildew Curative Trial Presented by: Chris Herries,
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1 Powdery Mildew Curative Trial 2014 Presented by: Chris Herries,
2 OP s / Carbaryl (June 2013)
3 What are growers using Cabrio + Spreadwet Lime Sulphur 1% Citrox (0.5%) Lime Sulphur 3% Citrox (1.5%) Nimbus (sulphur) + Protector Citrox (1%) + Sulphur Nordox (copper) + Nimbus (sulphur) + Protector 0.5% 100% leaf removed from fruit zone Nordox (copper) + Protector 0.5% Control Excel Oil 2% Excel Oil Plus 2% HML32 + Nordox Nordox Copper Pendant + Nimbus (sulphur) + Spreadwett Pendant + Spreadwet Phosgard HML32 + Potassium Bicarb + Nimbus (sulphur) Phosphoric Acid + Molassas HML32 + Potassium Bicarb + Nordox Teracep JMS Stylet Oil (1%) + Duwet JMS Stylet Oil 2% Potassium Bicarb + Spreadwet Pristine + Spreadwet Prostar + Spreadwet Proxima + Spreadwet
4 day 0 20 th Jan Applications day 7 27 th Jan day 14 3 rd Feb day th Feb 1 st application made 2 nd application made Assess trial Photo s taken All applications made with high water rate to the point of run off (1000lt/Ha)
5 Coverage (Excel oil) Front of Bunch Back of Bunch
6 Leaf Score Effect 0 10 Phosgard HML32 + Pot Bicarb + Nordox
7 Berry Score Effect 0 10 Cabrio + Spreadwet Excel Oil Plus
8 Nordox
9 Nordox
10 Results
11 HML32 + Pot Bicarb + Nordox
12 HML32 + Pot Bicarb + Nordox
13 Control
14 Control
15 Control
16 Wettable Sulphur + Protector
17 Should not be used as curative Pendant (Penconazole)
18 Should not be used as curative Prostar (Myclobutanil) Proxima (Quinoxyfen)
19 Should not be used as curative Pristine (Boscalid + Pyraclostrobin) Cabrio (Pyraclostrobin)
20 Curative Trial Results Leaf Control Berry Control Yellow indicates do not use curative use as a protectant only
21 Conclusion 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.
22 Conclusion 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.
23 Infection timing Overwintering mycelium causing flag-shoot infection Cleistothecia releasing ascospores to land on susceptible tissue causing infection? Level of infection risk dependent on overwintering inoculant from Powdery Mildew infection pervious season. Use curative chemistry to prevent Powdery Mildew establishment Powdery Mildew infections producing conidial spores and infecting susceptible tissue (flowers, berries, leaves, soft cane tissue) Providing protection preventing new infections. Use a curative if infections are present to stop further infection and cleistothecia production Sexual stage Cleistothecia production You are buggered need to have tight preventative program next spring
24 Timing is critical Critical period to prevent overwintering Ascospores or mycelium from establishment and then producing conidial which can then spread to flowers and berries Protectants must be maintained to prevent conidial spores from establishment on leaf, flowers and berries Too late for prevention. If present use a curative to try and reduce the production of cleistothecia for next season Critical Important Too late
25 Curative Curative Protectant Protectant Curative Protectant Protectant Protectant Protectant Curative Protectant Right products at right time Curative only if required to reduce cleistothecia production Curative Lime Sulphur HML32 Nordox Oil s - Excel Oil, Excel plus, JMS Protectant Wettable Sulphur Sulclean, Nimbus Penconazole Topas, Pendant Pristine Quinoxyfin Proxima -Qintec
26 Winter Flag shoot development Winter No green tissue nil risk of infection no spraying required Advanced bud swell Critical timing for curative spray Lime Sulphur OR Excel Oil Flag shoot development Critical timing for curative spray Lime Sulphur OR Excel Oil
27 Powdery Mildew in Organic s 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
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