Home' The River News : March 12th 2015 Contents 10 -- The River News, Thursday, March 12, 2015
Citrus Australia - SA Regional Wrap
IN PREPARATION FOR THE NEW
Internal fruit maturity: Good internal quality
standards are paramount to consumer satisfac-
tion and sales.
Three key factors that encourage consumers
to come back for repeat fruit purchases include
the level of sweetness, juiciness and a good bal-
ance between sweetness (brix) and acidity.
Small changes in acid levels have a large
effect on taste.
To ensure fruit with consistently good internal
quality is packed, compliance with the Austra-
lian Citrus Quality Standards (ACQS) is strongly
encouraged (refer to www.citrusaustralia.com.
au or email Sam Rogers (sam.rogers@citrusau-
stralia.com.au), who is also available for testing
Snail control: Snails become more active in
Implement a baiting program to comply with
export conditions, particularly the USA.
Apply good quality baits at label rates in prob-
lem patches, orchard perimeters, bin bays and
remove any areas where snails could harbour.
Continue weed control, as trees should have
already been skirted.
Copper: Pre colour break/autumn copper
application is essential for the control of diseas-
es such as septoria, anthracnose, greasy spot
and phytophthora (brown, fruit and collar/black
It is a fungicide protectant that kills bacteria
and stops the development of mould spores.
It also aids in pushing any snail infestations
out of the canopy.
Copper is not systemic and good, even cover-
age of smaller particle size droplets is required to
achieve a better spread.
Cuprous oxide (red copper) is reported to
result in less darkening of blemishes and does
not wash off as easily as copper oxychloride (blue
copper), helping packout.
Additional copper applications will be required
if we have a very wet start to winter.
Water pH should be >0.6 to avoid copper
Do not apply to unhealthy, water stressed or
logged trees or in hot/wet/dew conditions.
Allow drying time.
Do not mix with other chemicals (the only
exception is oil). Do not apply copper within
seven days before or after GA sprays.
EXPORT PROGRAM (KCT)
Registration: Grower and packer registrations
have been submitted to the Department of of
Agriculture (DoA) by CAL on the industry's behalf.
DoA will make packer contact to arrange site
audits of the packing process and set percentag-
es for growers annually.
Red Scale & Mealy Bug (KCT)
Oil application: Summer is the preferred
timing for oil applications as later applications
need to be considered carefully as this could
result in delayed colouration of the fruit.
Late applications should only be applied to
red scale affected patches that exceed thresh-
olds of 10-15 per cent and have crawlers and
white caps present.
Do not apply to early navel varieties.
Biological control: The natural enemy of
mealy bugs are ladybirds and cacewing larvae
and aphytis for red scale.
Aphytis has two or three generations for each
scale generation making it an effective natural
Consider an autumn aphytis release to replen-
ish orchard numbers.
Do not apply any sprays within four weeks of
Contact Biological Services for further infor-
mation (phone 8584 6977).
Chemical applications: Selected chemical
applications to control red scale and control/sup-
press mealy bug could be considered by applying
Movento (21 day WHP) or Lorsban (14 day WHP).
Any applications after this could affect har-
IMP programs could be disrupted if these
chemicals are applied.
Fuller's rose weevil (FRW) (KCT)
Peak egg laying occurs from late summer to
Maintain good weed control and trunk band
spraying for Thailand.
Nutrients and foliar sprays: Application of
nitrogen and potassium should cease by the end
Excessive and or late application of N and K
can cause fruit quality problems (rough skins)
and delay colour development.
Excess nitrogen promotes late flushes which
are susceptible to frost.
Navels can suffer rind staining and re-green-
ing could increase in valencias.
Lemons seem unaffected.
If required, phosphorous (P) sprays can assist
in counteracting some of the negative effects of
high nitrogen or potassium levels.
Calcium nitrate sprays may assist in rind qual-
ity. Apply a micronutrient spray on new autumn
Leaf analysis: Reminder: Leaf analysis is an
effective technique for monitoring the nutrient
status so ensure leaf samples are taken by mid-
The Fruit Doctors offer a leaf analysis service
(phone 8584 6977).
Excellent nutrient information and leaf analy-
sis standards for citrus can be found at: http://
Autumn GA: This application can be used
as a harvest management tool on winter navels
@10pm GA applied as follows:
Colour break: Apply to half of large blocks for
maximum delay of rind aging.
This will delay colour for 20-30 days and
could cause uneven colouration if harvested
Apply GA to the other half of the block at 10
per cent hard green, 50 per cent colour break GA
This will delay colour for 10-15 days (note this
is too immature for degreening).
Avoid applying GA on early navels.
Factors to consider/avoid when applying
early autumn GA sprays: May further delay
colour development in blocks with high nitrogen
and potassium levels.
More prone to developing oleocellosis.
Fruit needs to be picked and handled care-
fully.Do not apply to unhealthy, water stressed or
logged trees or in hot/wet/dew conditions. Allow
Do not apply with other chemicals (the only
exception is stop-drop sprays).
Do not apply GA for 3 -- 4 weeks after copper
or oil sprays.
Always calibrate your sprayer to ensure good
Water application rates for tree size are: small
5000 L/ha, medium 7500 L/ha and large 10
For autumn sprays raise the pH to 5 -- 5.5.
Test the pH before adding GA to the tank. Buffer
Do not add additional spreader if you used
an acidifying agent which normally contains a
Irrigation: Below average fruit size at this
time of year could indicate under irrigation.
Mandarins and tangelos need 30% more
water than oranges.
Water stress during March and April could
also result in Albedo breakdown.
Over irrigation could leach nutrients and aid
iron chlorosis and disease such as collar rot.
The use of a soil moisture monitoring device
to manage irrigation is particularly important at
this time of year when weather conditions are
Fertiliser calculator: This calculator was de-
veloped for free by the Department of Agriculture
and Food WA and available on the department
It is a simple tool which compares 1500 com-
mercially-available fertilisers for their nutrient
content, compatibility and price.
Growers can customise the calculator, creat-
ing their own fertiliser schedule to keep track of
the nutrients applied to each crop.
This information can be stored or printed.
Thank you to Rabobank for their kind sponsor-
ship of these important events.
Rabobank appreciates the challenges facing
Australia's rural sector. Contact: 08 8580 1900
Important diary dates:
March 16-17, 2015: Citrus Technical Work-
shop in Mildura 2015.
April 8, 2015: Citrus Australia's SA Regional
If you have questions about anything in this
week's column or an issue that you would like
to discuss please contact CASAR Chairman
Con Poulos firstname.lastname@example.org or
CASAR IDO Sam Rogers 0477 110 933 | sam.
Kevin's giant tomato a record hopeful
KEVIN Myers has grown a
1.715kg tomato that could be a
new South Australian record.
The Cadell man picked the
tomato about two weeks ago and
said he wanted to enter it in the
Diggers Tomato Festival at the
Adelaide Botanic Gardens.
"Growing giant vegetables is
all about having the correct feed,"
Mr Myers said.
"It is also about the genetics of
the tomato seeds. I use European
carp and manure on my plants.
tomato festival but they cancelled
it."Mr Myers is the co-ordinator
of the Murray River Giant Pump-
kin Competition at the annual
Cadell Harvest Festival on Easter
He said it was nearing the
end of the tomato season, and
he would now grow pumpkins to
enter the competition.
"You never really know what
the sizes will be like," the keen
"With my giant tomato I nor-
mally look for the biggest flower
and then pick off the rest of the
flowers so everything goes into
Mr Myers has entered the
tomato with the Giant Pumpkin
and Vegetable Association and
is waiting to hear if his 1.715kg
tomato is a new state record.
Meanwhile, preparations are
continuing for the Murray River
Giant Pumpkin Competition.
Event sponsors MGA Insur-
ance brokers managing director
Paul George said each year the
entries continued to increase.
"We have been supporting the
Murray River Giant Pumpkin
Competition for five years now
and we are amazed each year as to
the entries," he said.
"With the introduction of
other giant vegetables such as the
gourds and the tomatoes, it gives
the opportunity for many people
to have a go at growing the big
"Let's hope we can see those
giant pumpkin weights return
from the early years but as we
know, it all depends on the grow-
ing season ahead."
The Cadell Harvest Festival
will be on April 2, at the Cadell
Oval from 2pm to 7pm.
Cost is $3, with children under
For more information on
the Cadell Harvest Festival and
Murray River Giant Pumpkin
Competition people can call Kevin
Myers on 0428 518 944 or visit CADELL'S Kevin Myers with the 1.715kg tomato he grew.
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