Botrytis is a widespread fungal phytopathogen that causes grey mould on most fruits and vegetables often leading to the rapid loss of commercially viable crops.
The average losses from affected crops account for 20% of the total harvest, costing in the region of 10-100 billion euros worldwide.
Eden's encapsulated terpene products have antifungal activity and they confer several advantages over existing chemical anti-Botrytis treatments:
Vineyard field trials were designed to regulatory standards to assess both the protective and curative efficacy of Eden product 3AEY application, including analysis of crop safety and the chemistry of taint and residues in treated grape juice and wine. Test sites were located in Southern Europe.
Protective treatment efficacy
A mixture of 3AEY (200 mL per hectolitre) and the surfactant Silwet® L77 (United Agri Products; 50 mL/hL) compared well with two standard anti-Botrytis fungicides, Rovral® and Scala® (used at 150 g/hL and 200 mL/hL, respectively; both developed by Bayer CropScience; see Figure 1).
Figure 1. Average protective efficacy of grapevine treatments against Botrytis - data from 13 separate trials performed in 2006 and 2007 at sites in Southern Europe
Curative treatment efficacy
Botrytis disease control on infected grapes was assessed at 5 trial sites, again located in Southern Europe.
Efficacy data indicated that Eden product 3AEY performed better than Rovral® and Scala®, which is due to the enhanced flexibility of 3AEY application timing. In this case, grapes were sprayed up to 1 week prior to crop harvest, keeping Botrytis levels under control for longer.
Similar results were obtained following the analysis of disease incidence in untreated and treated grapevine plots at the 5 test locations. Compared with untreated plots, 3AEY reduced disease incidence by an average 78%, a greater reduction than that observed for Rovral® and Scala® (64% and 68%, respectively).
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