Download Managing anthracnose in mangoes

Managing anthracnose in mangoes
Anthracnose (Colletotrichum gloeosporioides and occasionally C. acutatum) is the major fungal disease of mangoes. Anthracnose can cause significant
postharvest losses and can ruin an otherwise high quality crop.
The disease lifecycle
Octave®
The critical stages for infection in mangoes are flowering and early fruit
development. Anthracnose spores are harboured in dead leaves and twigs, which
are washed onto the flowers or fruit by rainfall, dew or irrigation. In the presence of
free water the spores germinate and infect leaves, flowers and fruit. Refer to Figure
1 on the lifecycle of anthracnose in mangoes
Octave is highly effective against anthracnose blossom blight in mangoes. The
active ingredient of Octave, prochloraz, possesses locally systemic properties and
has strong contact and some translaminar mobility. It therefore exhibits both
protectant and eradicant activity. Where conditions favour disease development, the
strategic use of Octave will help to ensure optimum fruit set and pack-out.
FIGURE 1: Anthracnose lifecycle
Source: Rowland Holmes, Queensland Department of Primary Industries
When to use Octave
Octave should only be used over the flowering period from first pink flower to
fruit set (thumbnail size fruit).
Apply on a 3 to 4 week schedule, using the shorter interval when weather
conditions favour disease development.
How to get the Best out of Octave
While Octave offers 2-3 days kick-back (eradicant) activity, it should be applied
preventatively, prior to or soon after infection.
For longer residual control and as a part of a resistance management strategy,
Octave must be applied in a mixture with mancozeb.
Apply the mixture using high volume spray equipment or low volume misters
ensuring thorough coverage of blossoms. Spray volumes will vary depending on
age and size of the trees.
If wet weather prevails during flowering, the disease can build up causing severe
blossom blight destroying inflorescences and reducing fruit set. Developing fruit that
are infected may show symptoms soon after infection, or the infection may become
‘latent’ – meaning that symptoms do not develop until after harvest, as the fruit ripen.
Postharvest symptoms of anthracnose are sunken black spots, (see Figure 2) which
appear on the surface of the fruit during ripening.
FIGURE 2: Anthracnose disease symptoms
Source: Rowland Holmes, Queensland Department of Primary Industries
Bayer CropScience Contacts
Tony Fitzgerald
Horticulture Area Manager – Far North Qld
Mobile: 0418 226 529
Tim Murphy
Horticulture Area Manager – Burdekin/Mackay
Mobile: 0408 772 405
Tony McDermott
Horticulture Area Manager – Wide bay/Burnett
Mobile: 0417 221 421
Tim O’Grady
Horticulture Area Manager – Northern NSW
Mobile: 0419 533 994
Chris Themsen
Horticulture Support Manager
Mobile: 0408 768 593
Mitchell Faint
RDS – Far North Qld
Mobile: 0408 264 539
Pat English
RDS – Burdekin/Mackay
Mobile: 0417 404 966
Rob Vitelli
RDS – Wide bay/Burnett
Mobile: 0419 495 101
Don Biffin
RDS – Northern NSW
Mobile: 0417 370 798
Maree Scherer
Technical Information Co-ordinator
Phone: 1800 804 479
ANTHRACNOSE SPRAY PROGRAM FOR MANGOES
Bud initation
Bud swelling
Early flowering
Mid flowering
Late flowering
Fruit set
Copper hydroxide / Mancozeb
OCTAVE
®
+ MANCOZEB
Amistar *
NOTES:
1: Early flowering is a critical application timing for the prevention of anthracnose.
2: This program is a guide for controlling anthracnose during the flowering and early fruit set period.
3: Further applications of protectant fungicides will be required leading up to harvest.
®
Octave is a registered trademark of Bayer.
Amistar* is a registered trademark.
www.bayercropscience.com.au
Bayer CropScience Pty Ltd ABN 87 000 226 022
391 - 393 Tooronga Rd. East Hawthorn Vic 3123.
Telephone: 03 9248 6888 Facsimile: 03 9248 6800
The information and recommendations set out in this brochure are based on tests and data believed to be reliable at the time of publication. Results may vary, as the use and application of the products is beyond our control and may be subject to
climatic, geographical or biological variables, and/or developed resistance. Any product referred to in this brochure must be used strictly as directed, and in accordance with all instructions appearing on the label for that product and in other
applicable reference material. So far as it is lawfully able to do so, Bayer CropScience Pty Ltd accepts no liability or responsibility for loss or damage arising from failure to follow such directions and instructions.