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Montana State University (MSU) 1978

Etiology and epidemiology of the barley stripe disease (Pyrenophora graminea) in a semi-arid environment

Metz, Sally Gwillim

Titre : Etiology and epidemiology of the barley stripe disease (Pyrenophora graminea) in a semi-arid environment

Auteur : Metz, Sally Gwillim

Université de soutenance : Montana State University (MSU)

Grade : MASTER OF SCIENCE in PLANT PATHOLOGY 1978

Résumé
In 1973, a serious outbreak of disease in malting barley, first diagnosed as barley stripe (Pyrenophora grconinea), occurred in north- central Montana. These studies were begun in response to that epidemic and were designed to determine whether barley stripe was present in Montana, to evaluate the potential threat if the disease was not now widespread, and to determine appropriate means of control. ’ A survey for barley stripe was conducted on agricultural research centers throughout Montana and in farmers’ fields in the northcentral portion of the state. Net blotch, caused by P. teves3 was found in commercial fields, but not barley stripe. Barley stripe was present only in plots at the agricultural research centers, on cultivars grown from seed of European origin. Studies on spread of the disease from these foci showed that irrigation near heading increased the percent infection of seed with barley stripe threefold. In a dry environment, percent infection decreased to nearly zero. Commercially grown cultivars in Montana were screened for resistance to three isolates of P. gvaminea. Betzes, Erbet, Shabet, and Steptoe were highly resistant, while Horsford, Barker, and Ingrid were susceptible. Registered and experimental fungicides were evaluated in vitro for sources of potential seed treatments to replace Ceresan, which - formerly was used to control the disease. None were as effective as Ceresan, but several experimental fungicides have good potential.

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