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Controlled-release of Chlorine Dioxide in a Perforated Packaging System to Extend the Storage Life and Improve the Safety of Grape Tomatoes

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Grapevine downy mildew control using reduced copper amounts in organic viticulture.

A La Torre¹, V Pompi, C Mandalà

¹Agricultural Research Council (CRA), Plant Pathology Research Center, Via C.G. Bertero 22, IT-00156 Rome, Italy. anna.latorre@entecra.it

Communications in Agricultural and Applied Biological Sciences

|June 19, 2012

Summary

New copper formulations effectively control downy mildew in organic vineyards, significantly reducing copper input and soil residues. This offers a sustainable solution for organic farming practices. (29 words)

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Area of Science:

Agricultural Science
Environmental Science
Plant Pathology

Background:

Copper is an essential micronutrient but its accumulation in soil from plant protection products poses environmental risks.
Organic farming regulations limit copper use, prompting research into more sustainable alternatives.
The European Commission is reassessing permitted copper quantities due to new evidence.

Purpose of the Study:

To evaluate new copper formulations for reducing copper application rates in organic viticulture.
To assess the impact of these new formulations on copper soil residues.
To determine the efficacy of reduced copper dosages against Plasmopara viticola (downy mildew).

Main Methods:

A two-year field trial was conducted using randomized block design with four replicates.
New low-metallic copper formulations (Glutex CU 90, Labicuper) were tested against a standard product and an untreated control.
Efficacy was evaluated by monitoring downy mildew on leaves and bunches; copper residues were analyzed in leaves, grapes, and soil at different depths.

Main Results:

Tested copper formulations demonstrated effectiveness in controlling downy mildew at lower dosages than the standard.
Annual copper input was substantially reduced: Glutex CU 90 by over two-thirds, Labicuper by four-fifths to five-sixths compared to the standard.
Copper levels in grapes were below the residue limit (50 mg/kg), and no significant increase in soil copper residues was observed compared to the control.

Conclusions:

New cupric formulations can significantly minimize the environmental impact of copper use in organic viticulture.
Reduced copper application rates are achievable without compromising disease control efficacy.
These findings support the adoption of innovative copper formulations for sustainable organic farming.