Botry-Zen® was evaluated for efficacy against Botrytis cinerea fruit rots in a strawberry field trial at Tai Tapu, near Christchurch.
Disease levels were initially low but increased dramatically following periods of rain to reach moderate levels by the final disease assessment.
Botry-Zen® applied weekly over a 4-week period significantly reduced the total percent by number, of Botrytis infected fruit (at harvest and following 4 days ambient storage) at the time of the final assessment compared to the water control. However, disease control was less than in plots where 3 applications of the fungicide Switch® had been applied over a 4-week period).
Botry-Zen® appeared to be most effective when applied to protect the flowers and developing fruits in a preventative capacity.
Botry-Zen® may prove useful for reducing Botrytis infection within an integrated spray programme as an alternative to other fungicides with a protective mode of action. It should be applied so that protection is in place over flowering and repeated so that cover is provided throughout the harvest period. Botry-Zen® may also provide protection for periods when use of conventional fungicides may not be possible due to potential residue issues, or to assist in resistance management. It would also prove useful in organic production systems.
BOTRY-Zen® was trialled in Sweden on strawberries in 2006 with reports that the product had performed well, controlling rots as well as the fungicide treatment. BOTRY-Zen® and ARMOUR-Zen® have been trialled in Holland and the visual results to date are that the BOTRY-Zen®/ARMOUR-Zen® programme has performed as well as the fungicide programme. We are awaiting the statistical analysis.
BOTRY-Zen® was trialled on strawberries in the Waikato, New Zealand. There were very low levels of disease and no difference between the treatments (Untreated, BOTRY-Zen® or fungicide programme) were seen.