Adelaide Hills Crop Watch 201109

8/14/2019 Adelaide Hills Crop Watch 201109

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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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Friday,Friday,Friday,Friday, NovemberNovemberNovemberNovember 22220000thththth 2009200920092009and will be updatedand will be updatedand will be updatedand will be updated

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More Pest and Disease information is availableMore Pest and Disease information is availableMore Pest and Disease information is availableMore Pest and Disease information is available

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

CCCCCCCCCCCCrrrrrrrrrrrrooooooooooooppppppppppppWWWWWWWWWWWWaaaaaaaaaaaattttttttttttcccccccccccchhhhhhhhhhhh00%% AAPPFFAALLLL FFLLOOWWEERRIINNGG EELL Conditions have been ideal for a successful floweringand berry set. Capfall has occurred rapidly in allvarieties in all locations. Later blocks and varieties will

complete flowering over the coming days. SauvignonBlanc and Shiraz Blocks should finish flowering over theweekend. Chardonnay, Pinot Noir and Pinot Gris willbegin setting berries this week.

Powdery Mildew

Powdery Mildew is a creeping disease. It hides deep inthe canopy. Under humid overcast conditions Powderymultiples more quickly. Powdery doesnt need rain tospread, but it does do well in the humid conditionsbefore and after rain showers.

Many hours during recent days and nights have hadtemperatures between 20 and 28oC - this means thatthe temperature for Powdery has been ideal favouringmaximum production of spores.

In the CropWatch vineyards Powdery Mildew has beenkept in check.

The good news is good spray coverage = good diseasecontrol. Effective sprays now, before the canopy getstoo big, are worth more than trying to kill Powdery

before harvest.

Downy Mildew

Downy Mildew is a wet disease and needs rain to startits lifecycle. No Downy Mildew has been seen in anyAdelaide Hills vineyards. This confirms CropWatchsrecommendations, that canopies were not suitable forDowny Mildew infection when 10:10:24 Primary Eventconditions were recorded in mid-October.

Berries that are bigger than peasize (EL 31) are

resistant though the bunch stalks and the leaves remainsusceptible. At present there is no need to spray forDowny and the risk of Downy affecting harvest isdecreasing with each week without significant rain.

Full Flowering


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Light Brown Apple Moth

Light Brown Apple Moth caterpillars

have been seen this week, as expected;after flights of adult Light Brown AppleMoth were noted in monitored blocks inprevious weeks.

Check your vineyard for signs of AppleMoth in your bunches as shown below.

There is a link between LBAM grazingdamage in bunches and the spread ofBotrytis spores. When consideringcontrol LBAM assess your history of

bunch Botrytis. LBAM spread Botrytisand damage your developing berries.

Remember hot weather naturallycontrols small apple moth. Sustainedtemperatures above 32-35oC can cookthe caterpillars. Apple moth in coolerclimate vineyards do not have thisnatural control and a summergeneration can develop in large enoughnumbers to affect harvest. Apple Mothlevels tend to be higher in the AdelaideHills at harvest.

Botrytis

Botryis Bunch Rot needs rain ormoisture to spread. Any Botrytis presentin your vineyard now is dormant insideyour berries or present in small amountson any flower caps or dead plant

material trapped inside bunches as theyclose. No rain before harvest = nobotrytis.

Registered Light Brown Apple Moth Insecticides

Tradename Active AWRI

WithholdingPeriod

2009

Activity

Group

Prodigytm

Methoxyfenozide Use no later than

80% Capfall EL 25.

16A

Mimictm

Tebufenozide 16A

Success2

Natralytetm

EntrustNatralyte

tm

Spinosad Use no later than

EL Stage 31

(before bunchclosure).

5A

Proclaimtm

Emamectin Use no later than

EL Stage 31

(before bunch

closure) but do not

use later than 56days before

harvest.

6A

Avatartm

Indoxacarb 22A

Various Bacillus

thuringiensis

May be used until

harvest

n/a

Isomate

Pheromone

Tetradecentyl

Acetate +

Tetradecadienyl

Acetate

n/a

Trichogrammanza

careraeParasitic Wasp n/a


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Beneficial Insects

The importance ofpredatory insects in

vineyards is often talkedabout, but are they areal help? Where highnumbers of tough ordamaging pests likeGarden Weevil orWingless Grasshopperson their own they maynot be enough to controlthese pests.

However if the vineyard

has a balanced insectecosystem thenpredators do the hardwork for you andplagues of pests maynever develop.

Predator numbers inyour canopy willincrease at the start ofspring as insects moveonto the vines from

outside host plants. Theweather conditions andwhat you spray in thevineyard will thenchange the rate at whichthe population breeds.

Sulphur at high rateshas been shown to havean effect on the lifecycleof lacewings and otherbeneficial bugs.

Predators have troublesurviving summer ifcertain chemicals areoverused.

The Centre forEnvironmental Stressand AdaptationResearch (CESAR) hasa system which helpsrate the effects onbeneficial insects of

your spray programme.Visit the CESARwebsite here.

Above: A Lace Wing junk bug. Use of broad-spectrum insecticides decimatesthe natural predator population in a vineyard.

Below: A ladybird adult on the lookout for insects in the vineyard.

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Adelaide Hills Crop Watch 201109