Aspect of Incidence of the Major Citrus Diseases Recently

Research in Plant Disease 2013;19(2):102-107.
Published online June 30, 2013.

최근 주요 감귤 병의 발생 양상

현재욱 ( Jae Wook Hyun ) , 이평호 ( Pyoung Ho Yi ) , 황록연 ( Rok Yeon Hwang ) , 문경환 ( Kyung Hwan Moon )

Aspect of Incidence of the Major Citrus Diseases Recently

Jae-Wook Hyun1*, Pyoung-Ho Yi1, Rok-Yeon Hwang1 and Kyung-Hwan Moon2

¹Citrus Research Station, National Institute of Horticultural & Herbal Science, Rural Development Administration, Jeju 697-943, Korea
²Agricultural Research Center for Climate Change, National Institute of Horticultural & Herbal Science, Rural Development Administration, Jeju 697-943, Korea

Received: April 08, 2013 Revised: June 04, 2013 Accepted: June 07, 2013

Abstract

The percent of diseased fruit by Diaporthe citri was the most 16.8% in 2010 and the least 3.8% in 2005, and the average was 8.8% from 2003 to 2012. The degrees of disease incidence were relatively high, 17.0, 22.6, 19.2 and 18.9%, in 2003, 2004, 2007 and 2010, respectively. The percent of diseased fruit by Elsinoe fawcettii was the most 0.72% in 2004, and then gradually decreased to 0.08% in 2008, and the average was from 0.28% from 2004 to 2011. In case of canker by Xanthomonas citri subsp. citri, the percent of diseased fruit was the most 2.19% in 2004, and gradually decreased to 0.08 and 0.10% in 2009 and 2010, respectively. The average was 0.81% from 2004 to 2012. The melanose by D. citri was most in south-east area of Jeju Island, and east and west in case of canker. The melanose symptoms were initially appeared from mid June, mainly peaked late of July to late August. The canker symptoms were initially produced on leaves of natsudaidai and grapefruit cultivated in open field middle of June in 2010 and 2011 and late of May in 2012. The scab disease was firstly appeared approx. early or mid May and then rapidly increased late of May to middle of June. The inoculum was mainly produced from dead twigs late June to early of August.

Key Words: Canker, Disease incidence, Melanose, Scab