Studies on foot rot and leaf spot disease caused by Cochliobolus sativus.

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Young, C.J., 1976. Studies on foot rot and leaf spot disease caused by Cochliobolus sativus. PhD, Nottingham Trent University.

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Abstract

The study investigated the occurrence and importance of the foot rot fungus Cochliobolus sativus in Great Britain. Although the fungus is widespread in seed samples, the disease caused by the fungus appears to be of sporadic occurrence and restricted to highly susceptible varieties growing under condusive environmental conditions. In the last few years there have only been a few reports of severe outbreaks in the field.

The British isolates of the fungus were shown to be pathogenic towards barley. Wheat and oat appeared to be resistant. The recommended British barley varieties showed a range of susceptibility towards C. sativus when tested in laboratory, greenhouse and field experiments. The variety Clermont was shown to be highly susceptible while the majority of the varieties were fairly resistant.

Cultural studies of isolates of sativus from Britain, Netherlands, Canada, India and Australia demonstrated the extreme variability of the fungus. Sporulation, aerial myoelium, colony margin and saltation characters were found to be highly variable and could be used in isolate separation.

The isolates were also tested to compare their pathogenicity towards barley, wheat and oat. The British and Netherlands isolates were found to be similar being most pathogenic towards barley while the Indian isolates were more pathogenic towards wheat. The barley varieties ranged in their susceptibility, towards the British and Netherlands isolates, this v/as not apparent for the Canadian, Australian and Indian ones.

The control of the fungus by the use of seed treatment was investigated in both field and laboratory experiments. The treatments, incorporating a large number of different active ingredients, showed a range of control. Guazatine/Imazalil and 26,019 KP gave excellent control of the fungus while Benlate was found to increase the incidence and severity of the disease in the field.

Spore trapping experiments performed in 1974 and 1975 to investigate dissemination of spores of the fungus showed very few spores to be released throughout the growing period.

Item Type:

Thesis

Creators:

Young, C.J.

Date:

1976

ISBN:

9781369313956

Identifiers: