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Development of leaf spot caused by Ramularia carthami and reaction of safflower cultivars

Published online by Cambridge University Press:  27 March 2009

A. Kumar  and
H. K. Joshif
A. Kumar
Affiliation:
Indian Grassland and Fodder Research Institute, Jhansi 284003, India
H. K. Joshif
Affiliation:
Indian Grassland and Fodder Research Institute, Jhansi 284003, India
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Summary

Safflower (Carthamus tinctorius L.) is an important oilseed crop in India. A severe leaf spot disease caused by Ramularia carthami Zaprom. was observed in 1983 and investigations were carried out in order to analyse the role of environmental factors in disease development. High temperature and normal relative humidity, with dry rainless days, favoured disease development. Studies on the nature of in vivo resistance and susceptibility to R. carthami showed that growth of the fungal germ-tube was slower on resistant than on susceptible safflower cultivars, where the germ-tube extended with or without branching and penetrated infected leaves through the stomata. Of the four safflower cultivars evaluated, none were entirely free from the disease, but on the basis of lesion number and size, cultivar IGFRI-116 was rated as highly resistant.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 125 , Issue 2 , October 1995 , pp. 223 - 225
Copyright
Copyright © Cambridge University Press 1995

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References

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