Abstract
Biological peculiarities of the rye scald fungus <i>Rhynchosporium secalis</i> (Oud.) J. J. Davis, in one population of North-West region were examined. Seventy-eight isolates, the causal agent of scald, were taken from infected rye plants. This isolates were analalysed on rate of growth on artificial test medium, structure and color and temperature dependence. Single-spore strains were obtained from each natural isolate. Color and structure of some single-spore isolates remained stable through repeated transfers to fresh PDA medium.
Highlights
Leaf scald, caused by the fungus Rhynchosporium secalis (Oud.) J
Rye leaves infected by R. secalis we collected from shooting stage plants in one field of North-West region of Russia
It is known that isolation and cultivation of R. secalis on artificial medium is complicated, because of fungus growing slowly
Summary
Leaf scald, caused by the fungus Rhynchosporium secalis (Oud.) J. J. Davis, is a serious leaf disease of barley (Hordeum vulgare L.) and rye (Secale cereale L.). In the early stages of development appear the dark bluish-gray with water soaked lesions. These lesions are usually 1 to 2 cm in length increase several times before evident collapse of the tissue. This collapse appears very rapidly especially on barley. The scalded area soon dries and the center turns to light gray, the margin to dark-brown. Lesions of the rye have narrow light or brown margin, which is not well identify or is absent at all. Leaves are destroyed by severe infection and that results in complete defoliation of the host
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