Epidemiology of Kamal Bunt of Wheat Incited by Neovossia indica and an Attempt to Develop a Disease Prediction System

Nagarajan, S. (1991) Epidemiology of Kamal Bunt of Wheat Incited by Neovossia indica and an Attempt to Develop a Disease Prediction System. Project Report. CIMMYT, Mexico, D.F.

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Abstract

Re-investigating the life cycle of Tilletia indica showed that the allentoid spores, the infective agent, multiplies and monkeyjumps from leaf to leaf till they reach the boot leaf of the wheat plant. It is hypothesised that spells of drizzle, at boot leaf sheath stage washes the spores into the emerging earhead and causes infection. Subsequently, if the mid March maximum temperatures are mild, the systemic movement of thepathogen gets enhanced. Such situation lead towards an epidemic. In other words, more rainy days at the time of earhead emergence favours the disease. For both Indian and Mexican situations linear models could be developed having a R2 value of 0.9, which indicates their high fitness. The Mexicanprediction system was validated for 1990 and shows that the results agree with the predication. The analysis indicate that it is the number of rainy days at boot leaf stage that is important in the reccurreance of severe KB. These results support the hypothesis of inoculum rundown into the bootleaf sheath as the main mechanism favouring infection. The accurate disease prediction model opens up new areas for research such as the boot leaf earhead charecters etc

Item Type:	Monograph (Project Report)
Uncontrolled Keywords:	Triticum aestivum; Tilletia indica; Life cycle; Epidemiology; Prediction; India; Mexico
Author Affiliation:	International Maize and Wheat Improvement Center
Subjects:	Plant Production Crop Improvement > Biotechnology
Divisions:	General
Depositing User:	Mr Daneti Raju
Date Deposited:	13 Feb 2014 07:34
Last Modified:	13 Feb 2014 07:34
URI:	http://eprints.icrisat.ac.in/id/eprint/12577

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