Gray Mold on Carrot Caused by Botrytis cinerea in Korea

Park, Kyeong Hun; Ryu, Kyoung Yul; Yun, Hye Jeong; Yun, Jeong Chul; Kim, Byeong Seok; Jeong, Kyu Sik; Kwon, Young Seok; Cha, Byeong Jin

Research in Plant Disease 2011;17(3):364-368.
Published online December 30, 2011.

Gray Mold on Carrot Caused by Botrytis cinerea in Korea

Kyeong Hun Park, Kyoung Yul Ryu, Hye Jeong Yun, Jeong Chul Yun, Byeong Seok Kim, Kyu Sik Jeong, Young Seok Kwon, Byeong Jin Cha

Abstract

Gray mold caused by Botrytis cinerea was found on a carrot seedling in a greenhouse and a field at Daegwallryeong, Gangwon Province in 2007.2009. Symptoms included irregular, brown, blight, or chlorotic halo on leaves and petioles of the carrots. Fungal conidia were globose to subglobose or ellipsoid, hyaline or pale brown, nonseptate, one celled, 7.2.18.2 × 4.5.11 μm (12.1 × 8.3 μm) in size, and were formed on botryose heads. B. cinerea colonies were hyaline on PDA, and then turned gray and later changed dark gray or brown when spores appeared. The fungal growth stopped at 35oC, temperature range for proper growth was 15.25oC on MEA and PDA. Carrots inoculated with 1 × 105 ml conidial suspension were incubated in a moist chamber at 25 ± 1oC for pathogenicity testing. Symptoms included irregular, brown, water-soaked rot on carrot roots and irregular, pale brown or dark brown, water-soaked rot on leaves. Symptoms were similar to the original symptoms under natural conditions. The pathogen was reisolated from diseased leaves, sliced roots, and whole roots after inoculation. As a result, this is the first report of carrot gray mold caused by B. cinerea in Korea.

Key Words: Botrytis cinerea, Daucus carota L. subsp. sativas (Hoffm), Leaf blight