식물병연구 Note Open Access Res. Plant Dis. 23(3) : 283-287 (2017) https://doi.org/10.5423/rpd.2017.23.3.283 Analysis of the Cause of the Twig Blight on Mulberry Based on the Weather Conditions * *Corresponding author Tel: +82-63-290-6183 Fax: +82-63-290-6198 E-mail: kimjuhee@korea.kr Ju-Hee Kim*, In-Young Choi, Ju Kim, and Jang-Ho Lee Division of Climate Change Response, Jeollabuk-do Agricultural Research and Extension Services, Iksan 54591, Korea Received May 11, 2017 Revised July 20, 2017 Accepted July 20, 2017 The twig blight of mulberry caused by Fusarium lateritium occurs mainly in Buan area, which is the main area of mulberry. The initial symptom on twigs showed dark edge blight and dark orange tiny particles on the spot, and it was withered and died. In the case of mulberry twig blight, the difference in the degree of occurrence between the years is intense, and an average of 2.7% occurred in Buan in 2013, but in 2014, it was difficult to search for the generated fields. In order to find the cause of the difference in the incidence of mulberry twig blight, we investigated and analyzed the weather conditions during cultivation and as a result, the occurrence of the disease increased under the condition that the temperature of the spring was lower and the number of days passing below the winter freezing point increased. In addition, it was analyzed that the occurrence of the next year increases when the rainfall is high and the number of sunshine is low after removing the harvested branches. Therefore, in the event that weather conditions causing twig blight diseases have elapsed, it is necessary to prevent the disease by spraying the registered applied fungicide prophylactically. Keywords: Mulberry, Twig blight, Weather condition (Kim, 2002) (Kim, 2004). 1,751 ha (2011), 70% 390 ha 23.3% Research in Plant Disease pissn 1598-2262, eissn 2233-9191 www.online-rpd.org (MIFAFF, 2012).,,,,,,,,,,. 90. 1990,,,, The Korean Society of Plant Pathology This is an open access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/ by-nc/4.0/), which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
284 Research in Plant Disease Vol. 23 No. 3 (Yoon, 1994). (Sung, 2013) (Hong, 2007)... 2... 2013 2014 2 3 6 1-2.,, 20,. 10, 10 100. 4 6.., (Fig. 1). 5-6. 25%, 2013 2.7%(0-25%). 2014, (Table 1).. 1% NaOCl 3 potato dextrose agar Fig. 1. Symptoms of twig blight of mulberry (Morus alba) caused by Fusarium lateritium in field. Table 1. The disease incidences of twig blight in mulberry in Buangun of Jeonbuk province during 2013 to 2014 Year 25 o C 7. 3 3.8 30.9 mm. GENIII microstation (Biolog, USA) carbon source utilization, chemical sensitivity reaction (sequencing data analysis (MicroseqID v2.0-abi)) Fusarium lateritium. 30-40 cm 1 10 6 cfu/ml 25 o C. 14. Disease incidence* (%) Apr. 4 Apr. 21 May 2 May 15 Jun. 5 2013 0.1 1.5 2.3 2.3 2.7 2014 0 0 0 0 0 *Number of diseased twig blight/number of surveyed twig 100..
Research in Plant Disease Vol. 23 No. 3 285,. (Sengupta, 1991) 4 6 1 3,. 4 6 2014 2013 0.7 o C 96.9 mm (Table 2). 1 4 2013 2014 (Fig. 2). (Kim, 2009; Nam, 1998) 3 2014 11 2013 26 3 2013 8, 2014 1 7 (Table 3). (2012 ) Table 2. Monthly precipitation and average atmospheric temperature in spring from April to June during the growing season of mulberry in Buan-gun of Jeonbuk province during 2013-2014 Month Precipitation (mm) Temperature ( o C) 2014 2013 2014 2013 Apr. 74.8 77.8 12.5 9.5 May 43.5 133.3 17.7 17.0 Jun. 62.3 69.4 22.3 22.4 Cumulative amount/ave. 183.6 280.5 17.5 16.3 Compared to a lot of years (2013) 96.9 0.7 (2013 ) 577.1 mm 39.4 h (Table 4). 3 4-6,. Minamizawa (1997), Saito Table 3. Number of days of below zero temperature just before sprouting from flower buds of mulberry in Buan-gun of Jeonbuk province during 2013-2014 Year Mar. 1 Mar. 31 Mar. 15 Mar. 31 2013 18 8 2014 8 1 Compared to a lot of years (2013) 10 Table 4. Monthly precipitation and total sunshine time after removing fruit bearing branch of the previous year of surveyed for disease occurrence Month Accumulation precipitation (mm) 7 Total sunshine time (h) 2013 2012 2013 2012 Aug. 242.0 631.8 248.2 152.9 Sep. 62.0 219.8 184.3 162.5 Oct. 15.5 45.0 214.8 213.4 Cumulative amount 319.5 896.6 215.7 176.3 Compared to a lot of years (2012) 577.1 39.4 Fig. 2. Minimum temperature during January to April during the growing season of mulberry in Buan-gun of Jeonbuk province during 2013-2014.
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