African Journal of Agricultural Research Vol. 2(7), pp. 305-308, July, 2007

ISSN 1991- 637X­© 2007 Academic Journals

Full Length Research Paper

Epidemiological studies of white rust, downy mildew and Alternaria blight of Indian mustard (Brassica juncea (Linn.) Czern. and Coss.)

Sangeetha, C.G*.  and A. L. Siddaramaiah

Department of Plant Pathology, G.K.V.K, University of Agricultural Sciences, Bangalore –560065.

*Corresponding author. E-mail: sangeethacg@rediffmail.com

Accepted 21 June 2007

White rust, downy mildew and Alternaria blight caused by Albugo candida (Pers.) Kuntze Peronospora parasitica (Pers.) (de Bary) and Alternaria brassicicola (Schw.) Wiltshire respectively are important diseases on Indian mustard causing considerable loss. Maximum temperature positively correlated with disease index of all the three diseases. Maximum temperature from 26-29ºC and average relative humidity of more than 65 per cent favoured the development of all the three disease.

Key words: Disease incidence, maximum, minimum temperature, relative humidity.