Improvement and Effectiveness for Chemical Control Protocol of Sweet Persimmon Anthracnose Disease

Abstract Anthracnose, caused by Colletotrichum spp. is the most important and devastating disease insweet persimmon production in worldwide. There is no alternative control method or resistant cultivar isavailable. Therefore, chemical controls are widely accepted to control the disease. Three fungicides among 16fungicides have been selected to apply in field condition. The selected three fungicides (metconazole,dithianon and propineb) showed lower EC 50 and reliable control effect in both in vitro and in vivo. Accordingto general guide line of anthracnose disease control method recommended 8 times spay of the fungicide. Inthis study, we performed 8, 4, and 2 times spay of the fungicides. For 8 times application, practice spraymachine has been used and for 4 and 2 time application, a recently invented spray machine was input. Thefungicides have been treated from middle of June to end of August in 2014 year. Control effect of among theselected fungicides showed similar result regardless of sort of the fungicide. However, frequency of sprayresult showed significantly different results, 8 and 4 times fungicide application showed low and similardisease occurrence, but 2 times application showed intermediated disease occurrence between 4 timestreatment and untreated control. Taken together, result showed that 4 times application with effective fungicide,mechanically advanced tool can reduced the anthracnose disease damage in sweet persimmon production.Key words Colletotrichum spp., Fungicide, Sweet persimmon