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Showing posts from January, 2010

Weevils - look out in Kuitpo vineyards

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Garden Weevils are being found in Kuitpo. They are being found in canopies and bunches.

Adult weevils emerge from the soil in mid to late October and are most numerous between November and December. Many adults survive until April with some being present through winter. Adult garden weevils attack foliage, buds and fruit. Grapes can be scarred, while leaves usually have distinctive round holes and ragged edges. Adult weevils can weaken grape bunches by ringbarking the stalk – so look out for bunch damage in the coming weeks.

C Grade

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Why we consider this vineyard to have a lower quality in the field.
1) Short shoots which haven't lignified and have bunches on them ripening slower than the main crop (below).
2) More shaded fruit; especially on the lower cordon.
3) Moderate to large berry size.


A/B Grade Shiraz.

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What we consider to field grade an A/B Grade.
1) Open canopy with good light exposure.
2) Even fruit development - all bunches ripening at the same rate.
3) Fruit all on main 'count' shoots which have lignified up. No short shoots with fruit.
4) No sunburnt fruit or fruit that is mushy or cooked.
5) Healthy functioning leaves.
6) Small to moderate berry size.

Vine Balance - A/B Grade Shiraz Photos

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Above- Shiraz this week has fully coloured and completed verasion (EL 35). Note the dappled light on the fruit.
Below- Balanced Shiraz at harvest (2004 Vintage).


A vine can be described as ‘balanced’ when vegetative growth and fruit load are in equilibrium. Other indicators of balance include early maturity, ability to store good reserves of carbohydrate, low shoot variability and cessation of shoot growth by veraison. In order to achieve balance in the current season, vines must have an adequate number of active leaves (shoot to fruit ratio) to sufficiently ripen fruit.

Vine balance can be assessed by a number of methods. The most common is the measurement of fruit weight to pruning weight ratio. Balanced vines have a pruning weight ratio in the range of 5 to 10:1(Dry et al, 2004).

The second method is the measurement of active leaf area per gram of fruit, expressed as cm2/g. The optimum active leaf area for balanced vines varies and may range from 6 to 25 depending on variety, climate…

Botrytis

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The first signs of Botrytis bunch rot were found yesterday by James and Sam. In both cases the fruit had been damaged and Botrytis had developed. The photo (above) shows the link between Light Brown Apple Moth caterpillars and Botrytis. In this case the Apple Moth had damaged the berry skin triggering Botrytis expression, then the Apple Moth caterpillar has transferred Botrytis around the bunch to infect new berries (below).

Bunch Powdery Mildew in the Adelaide Hills - ID Photo

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Matthew Wilson reports from the Adelaide Hills - Cooler weather this week has allowed the continued spread of Powdery Mildew (above). Some blocks throughout the district are now presenting very high levels of bunch powdery. Heavy canopies have provided ample protection and cover for powdery to flourish. Most leaf infections have been controlled, but in many cases, bunches deep within the canopies are still showing devastating levels of active powdery mildew (below).

Buttshoot removal and leaf plucking are being employed in some chardonnay blocks. This helps increase fruit exposure and airflow which can naturally help control powdery. Low levels of bunch powdery is now being detected on bunches in Sauvignon Blanc blocks. There is still time to control this effectively, before withholding periods limit control strategies.

Sunburn is drying out and shrivelling up.

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Sunburnt fruit from last week is drying up (above) and will drop out before harvest. This fruit should not affect the quality of your harvest - although some yield loss will have occurred where high amount of sun scorching and heat damage have occurred.
Vines have survived the heatwave of 2010 in much better condition than the late January heatwave of 2009. Be alert for further heatwaves and try to get as much water into your subsoil as possible in the days leading up to the heat. Anti-stress or sunscreen products may help but seek your wineries permission first before applying.
In the medium term post harvest care of vineyards takes on an increased importance. Vineyards have experienced tough, dry growing conditions for 4 out of the last 5 years (2007, 2008, 2009 and 2010). Many vineyards have been reduced in vigour compared to the middle of this decade 2005/06.

CropWatch Adelaide Hills.

Heat and sunburn - ID Photos

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Heatburn has been observed on some vineyards. Only a small percentage of fruit has been burnt (turned pink). This will turn shrivel, turn hard and fall out of bunches before harvest. The heat also scorched leaves as shown (below).
However despite the high temperatures vines are in better condition than Vintage 2009. Good news.
Monitor soil profiles to ensure they have adequate soil moisture before and during any further heatwaves. Experience from Vintage 2009 showed that it was best to water before heat stress rather than during heatwave conditions.
Remember vines use the most water during veraison. Avoid water stress to vines when berries soften and colour. Do not perform RDI (regulated deficit irrigation) during veraison.

Climate change article from the Age Newspaper.

Grape growers first to harvest a bunch of changes

JENI PORT - January 10, 2010
''SNOW'' Barlow's 2010 vintage is still an idea, the wine grapes formed but not ready to turn in colour or give up fleshy juice.
Two months after flowering and still in a dreamy pre-pubescence, they're about to get a nasty awakening, a major test of stamina, with temperatures destined to hit about 40 degrees today and tomorrow in Central Victoria.
Professor Barlow's Baddaginnie Run Wines and Seven Sisters Vineyard, 24 hectares of vines set against a backdrop of granitic outcrops that make up the Strathbogie Ranges north of Melbourne, are already feeling the effects of an unusual burst of hot weather that occurred in early November.
The dams are evaporating fast, and water is rationed to sustain some grapes through to harvest. Others will have to fend for themselves.
Recurring extreme weather, the face of climate change, is altering the nature of Victoria's - and Australia…

CropWatch Adelaide Hills

Maurivin Yeast Range

DJ's are getting their wine range ready for the vintage (below).

Attributes of Maurivin Yeast