4.8.5
SEEDBORNE NATURE OF ALTERNARIA ALTERNATA IN CUMIN, ITS DETECTION AND LOCATION IN SEED

MP JAIN

AIC Research Project on Seed Spices in Rajasthan, SKN College of Agriculture, Jaipur, Rajasthan, India

Background and objectives
This paper reports the findings of research work carried out on Alternaria blight of cumin, caused by Alternaria alternata, in the AIC Research Project on Seed Spices in Rajasthan. Our objectives were (i) to find out the percentage incidence of A. alternata in cumin seeds; and (ii) to determine the exact location of A. alternata in seeds.

Materials and methods
The standard methods used were incubation tests [1], component plating [2] and seedling symptom test [3].

Results and conclusions
Infection of A. alternata in cumin seeds was observed to be external and internal in all seed samples tested, but internal infection was found to be the greater in nine samples out of 12. The presence of A. alternata was also detected in pericarp, medcarp and embryo. Blight symptoms were also observed on seedlings and growing plants by artificially inoculating the apparently healthy seeds before sowing.

References
1. ISTA, 1976. Seed Science and Technology 4, 51-177.
2. Singh D, Mathur SB, Neergard P, 1980. Seed Science and Technology 8, 85-93.
3. Agarwal VK, Sinclair IB, 1987. Priciples of Seed Pathology, Vol II. CRC Press, Boca Raton, Florida, pp 45-47.