Submitted by Spicepedia
Taphrina maculans is the causative agent of leaf blotch in turmeric.
Taphrina maculans is a fungus which is mainly air borne. The fungus produces brown leaf spots and the mycelium grows in the subcuticular interspaces of the epidermis and produces cuboid ascogenous cells on leaf debris and as dessicated ascospores or blastospores in the soil and on fallen leaves. Primary infection occurs on lower leaves with the inoculum surviving in dried leaves of host, left over in the field. Secondary infection is most dangerous than primary one causing profuse sprouting all over the leaves. The pathogen may remain in dormant stage in the dried rhizomes and become active when the crop is grown in the field and initiate infection. The pathogen sends branched or lobed haustoria inside the host cells for drawing nutrition from it.
Symptoms:It appears as small, oval, rectangular or irregular brown spots on either side of the leaves (prominent on upper surface) which soon become dirty yellow or dark brown. The spots coalesce freely and form irregular lesions. In severe cases the plants present a scorched appearance and the rhizome yield is reduced.
Management:Field sanitation should be practiced. The disease can be controlled by spraying mancozeb 0.2%.
Reference:P. N. Ravindran, K. Nirmal Babu, K. Sivaraman(2007). Turmeric- The Genus Curcuma, CRC Press,pp. 158-159. V. A. Parthasarathy, K. Kandiannan, V.Srinivasan (2008). Organic Spices, New India Publishing. V. A. Parthasarathy, A. I. Bhatt, Utpala Parthasarathy(2008). Spice Crops, Today’s and Tomorrow’s Printers and Publishers. pp. 292-304. Turmeric- Extension pamphlet (2008). Indian Institute of Spices Research.