A system to control Glomerella cingulata on strawberry by using fungicides on the basis of their residual activity

We selected effective fungicides from twelve fungicides registered for use against Glomerella cingulata on strawberry by determining their control effects when applied to strawberry seedlings prior to the seedlings being inoculated with Glomerella cingulata. The control effects of manzeb, propineb, and captan were high on strawberry seedlings inoculated with Glomerella cingulata at 7 days after application of the fungicides in 2010 and 2011. In 2010, the control effects of azoxystrobin and ordano­copper were high, and in 2011 the control effect of fludioxonil was also high. Of the fungicides tested, only fludioxonil was effective when Glomerella cingulata was inoculated 10 days after fungicide application. The most effective control system in field tests was 7-day-interval application of manzeb, propineb, captan, and ordanocopper; the rate of withering-to-death of stock 27 days after last fungicide application was the lowest with the 7-day-interval application of fungicides. On the basis of these results, we recommend the 7-day-interval application of manzeb, propineb, or captan plus ordanocopper, and the application of fludioxonil as an adaptable control, as a control system for Glomerella cingulata on strawberry.