Viticulture

Table Grapes & Vine Grapes

Maintain the typical spray protocol for the grape vines.

Grapevines are susceptible to vascular diseases such as the fungal Eutypa dieback or bacterial canker that causes dieback symptoms. REMEDiAg OCC can help mitigate these vascular diseases while improving productivity and quality.

For Eutypa dieback,  REMEDiAg OCC  together with a 3% concentration of hydrogen peroxide or fungicide, should be included in the spray mix

Over a single harvest cycle, applications of  REMEDiAg OCC may vary from 2 to 5 times per cycle according to nutrient and protection sprays that may be needed for the vines.

For robust growth, spray REMEDiAg OCC at the following stages:

  • After post dormancy pruning**

  • Before fruit development

  • After midseason trimming**

  • Latter stages of fruit set

  • After harvest**

REMEDiAg OCC can also be integrated with the spray mixes of nutrient and protection sprays at all of the above stages.

Dosage concentration rate is 1 : 3000
1 part REMEDiAg OCC to 3,000 parts spray solution  (by volume)

By combining REMEDiAg OCC with Hydrogen Peroxide or fungicides, growers can mitigate the onset of vascular, fungal and viral diseases on grapevines.

The first spray after post-winter pruning is the most critical and must ensure complete coverage of the canopy, the trunk system, and the rootstock area.

The rationale of this approach is that Eutypa dieback is a condition of the xylem, which begins from the root zones and flows to the canes.

Complete coverage with the spray will ensure that the generated free oxygen molecules can effectively cleanse the infected xylem, providing a thorough and reliable solution to the problem.

For the control of dieback

Grapevine trunk diseases are becoming an increasing threat to the sustainability of the Australian wine industry. The pathogen Eutypa lata, (E.lata), is the primary cause of the serious Eutypa dieback disease that attacks the woody components of the vine and is hard to control. Another similar disease caused by Diplodia seriata,(D.Seriata), is Botryosphaeriacae dieback.

In June 2020, an in-vitro experiment was conducted in Australia to evaluate the efficacy of REMEDiAg OCC mixed with a range of concentrations of hydrogen peroxide (H202) for controlling Eutypa lata and Diplodia seriata (Botryosphaeria spore germination and mycelial growth).

Colony growth of Eutypa lata and Diplodia seriata after 7 and 4 days incubation, respectively, under fluorescent light 12h each day and 25ºC on potato dextrose agar amended with REMEDiAg OCC and H₂O₂ treatments, compared with Gelseal (tebuconazole) and an unamended control.

Result:

Results showed that REMEDiAg OCC added to H₂O₂ at 3% and 5% inhibited spore germination and mycelial growth of E. lata and D. seriata on amended agar. The REMEDiAg OCC and H₂O₂ treatments were more effective than an industry-standard fungicide (Gelseal) at inhibiting spore germination and had similar efficacy for inhibiting mycelial growth. The result indicates that REMEDiAg OCC and H₂O₂ treatments can potentially control Eutypa and botryosphaeria dieback in grapevines. In evaluation, the spray protocol's design, particularly on timing and application method, is vital to accurately assess the treatments' efficacy in controlling Eutypa dieback in the fields.

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