Controlling Effect of Agricultural Organic Materials on Phytophthora Blight and Anthracnose in Red Pepper

Research in Plant Disease 2012;18(1):1-9.
Published online March 30, 2012.

고추 역병과 탄저병에 대한 친환경유기농자재의 방제 효과

박세정 ( Se Jung Park ) , 김가혜 ( Ga Hye Kim ) , 김아형 ( A Hyeong Kim ) , 이호택 ( Ho Taek Lee ) , 권현욱 ( Hyeon Wook Gwon ) , 김주형 ( Joo Hyeng Kim ) , 이경희 ( Kyeong Hee Lee ) , 김흥태 ( Heung Tae Kim )

Controlling Effect of Agricultural Organic Materials on Phytophthora Blight and Anthracnose in Red Pepper

Se-Jung Park, Ga-hye Kim, A Hyeong Kim, Hotaek Lee, Hyeon-wook Gwon, Joohyeng Kim, Kyeong Hee Lee1 and Heung Tae Kim*

Department of Plant Medicine, College of Agriculture, Life Science and Environment, Chungbuk National University, Cheongju 361-763, Korea
1Environment-friendly Research Division, Chungcheongbuk-do Agricultural Research and Extension Sevices, Cheonwon Chungbuk 363-883, Korea

Received: February 06, 2012 Revised: March 15, 2012 Accepted: March 15, 2012

Abstract

A total of 20 agricultural organic materials including inorganic compounds, plant oils and plant extracts were used in the study for assessing the control efficacy on pepper diseases. Among inorganic compounds, only copper hydroxide showed inhibitory effect on both Phytophthora capsici causing Phytophthora blight and Colletotrichum acutatum causing anthracnose. Phosphorous acid inhibited the growth of P. capsici on PDA, and Sulfur/quicklime had it on that of C. acutatum. Plant essential oil, rosemary oil, and rapeseed oil among plant oils and plant extract of Japanese apricot/ginkgo nut inhibited the mycelial growth of the two pathogens. In the screening using pepper plant seedlings, the control efficacy on Phytophthora blight in 6-leaf stage of seedling was superior to that in 4-leaf stage of seedling. A protective effect on Phytophthora blight was displayed by copper hydroxide, sulfur/quicklime, water soluble calcium, phosphorous acid, plant essential oil, and cloves extract. When C. acutatum was inoculated by the non-wound method, copper hydroxide and rapeseed oil showed excellent protective activities with control values of 91.3% and 82.6%, respectively. However, copper hydroxide did not show any activity, when C. acutatum was inoculated after wounding pepper fruits. All organic materials never showed the curative effect on Phytophthora blight and anthracnose in pepper seedling assay and fruit assay.

Key Words: Environmentally-friendly agriculture crop protectants, Inorganic organic agricultural products, Plant extract, Plant oil