Research in Plant Disease 2009;15(3):187-192.
Published online December 30, 2009.
고추 흰가루병균(Leveillula taurica)의 발아특성 및 접종법
김대현, 박종한, 이중섭, 한경숙, 한유경, 황정환
Effect of Temperature, Relative Humidity on Germination and Development of Powdery Mildew (Leveillula taurica) on Pepper and Its Inoculation Method
Dae Hyun Kim, Jong Han Park, Jung Sup Lee, Kyung Sook Han, You Kyoung Han, Jeong Hwan Hwang
Pepper powdery mildew, Leveillula taurica is one of the most important pathogens of pepper in the greenhouses and fields in Korea and is becoming a worldwide disease. These experiments were carried out to investigate the optimal germination, disease development conditions, disease incidence and effective inoculation methods of pepper powdery mildew. The incidence of powdery mildew was investigated throughout the country based on the major pepper growing areas in 2009. The average rate of infected leaves ranged from 15.3% to 81.8% in greenhouses and fields. Powdery mildew incidences were more severe in greenhouses than those of fields. The optimal temperature for conidial germination was 25oC and showed the highest germination at 6 hs after treatment. The range of temperature for germination was 10oC to 35oC. Temperature of greater than 30oC and below 20oC affected the abnormal germination and germ tube elongation. The optimal relative humidity for germination and germ tube elongation was 85% and germination increased as relative humidity increased. Disease development started 8 days after inoculation and showed the highest disease severity at 15 days in greenhouse and field regardless of varieties. Among three different inoculation methods tested the spore dropping method was better than touching with infected leaves and spraying with spore suspension. However, the method has limitation in mass inoculation due to the amount of time consumed.
Key Words: Disease incidence, Germination, Germ tube, Leveilula taurica, Pepper, Powdery mildew

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