8/14/2019 Adelaide Hills Crop Watch 241209

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CropWatch SA Adelaide Hills is a service provided by the Adelaide Hills Wine Region Inc. DJs Grower Services provide vineyard monitoring data, interpret weather data &compile the messages. Information is general in nature and should not be relied upon. Always seek professional advice specific to your vineyard. All photos (c) JamesHook & Richard McGeachy unless noted. CropWatch acknowledges the support of James Hook & Matthew Wilson in preparing this message.

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www.adelaidehillswine.blogspot.comwww.adelaidehillswine.blogspot.comwww.adelaidehillswine.blogspot.comwww.adelaidehillswine.blogspot.com

A Secondary Downy Mildew Eventdid not occur this morning. Good

news.

The region only received a very smallamount of rainfall in the 4 hoursbefore dawn and humidity did not getto 98%. This means Downy Mildewwill not sporulate and spread.

Event Date

10:10:24 (PrimaryEvent).

28th ofNovember

Primary Oilspots. 7th of

DecemberWarm, wet night(Secondary Event).

8th ofDecember

Secondary Oilspots. 15th ofDecember

Warm wet night(Secondary Event)

18th ofDecember

Where growers have taken actionDowny Mildew levels have largelyremained steady with little secondaryspread. Generally the warnings have

been heard and acted upon in anadequate period.

The main disease issues have beenseen in vineyards that have not beenadequately protected (left). Thesevineyards now have a significant levelof Downy Oilspots and in some rarecases bunch loss (below left).

It is strongly recommended growersinclude Downy Mildew protectants

with their remaining fungicide sprays.The late season options are captan,copper or mancozeb.

8/14/2019 Adelaide Hills Crop Watch 241209

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CropWatch SA Adelaide Hills is a service provided by the Adelaide Hills Wine Region Inc. DJs Grower Services provide vineyard monitoring data, interpret weather data &compile the messages. Information is general in nature and should not be relied upon. Always seek professional advice specific to your vineyard. All photos (c) JamesHook & Richard McGeachy unless noted. CropWatch acknowledges the support of James Hook & Matthew Wilson in preparing this message.

Powdery Mildew

Powdery Mildew has also been spreading again this week. Warm, dewy mornings increase humidity inyour canopy which helps the spread of the disease. Upper leaf infections and bunch infections have

been found this week in CropWatch blocks. Look out for the symptoms of bunch Powdery shown below.

Weed growthWeeds levels have also increased as recent rainfall and dews keep plants fresh and actively growing.Wireweed, especially has thrived in the humid, shaded environments.

Withholding Periods

Berry development is progressing steadily. Shiraz at Meadows and Balhannah has berries that aretouching Pre-Bunch closure (EL 32). Chardonnay, Pinot Noir and Sauvignon Blanc are also at or pastBunch closure.

GRAPEVINE PRODUCTS THAT CANNOT BE USED AFTER BERRIES PEASIZE (EL 31).

Name Withholding Period Target

Proclaim,Avatar

Peasize - EL 31, no later than 56 days before harvest. LBAM

Success2,Entrust

Peasize - EL 31. LBAM

Flint 500 WG,Cabrio

Peasize - EL 31 Powdery & Downy Mildew

Switch Peasize - EL 31 (before bunch closure) but no later than60 days before harvest.

Botrytis

Topas 100EC EL 31, no later than 60 days before harvest. Powdery Mildew

Legend EL 31, no later than 42 days before harvest. Powdery Mildew