Występowanie typu wzrostowego R grzyba Tapesia yallundae i jego wrażliwość na wybrane fungicydy [Occurrence of R-growth type of Tapesia yallundae fungus and its sensitivity to some fungicides]

Abstract

From winter wheat and winter triticale stems with distinct disease lesions 123 isolates of eyespot agent – Tapesia yallundae fungus were obtained. Stems were collected in 1999–2001, from no-treatment and protected with fungicides fields, which were situated in three provinces of Poland (małopolskie, mazowieckie, śląskie). Obtained isolates were classified on the basis of morphology on PDA, sporulation on water agar and sensitivity to carbendazim and prochloraz 51 isolates (i.e. 41,5% of all) represent R- growth type of fungus. To this type belong 28% and 71% strains obtained from wheat and triticale stems, respectively. Only seven isolates ofR-type fungus (i.e. 13,7%) were resistant to carbendazim. These strains originated from two protected with carbendazim winter wheat fields and two no-protected winter triticale crops. All isolates of R-type were sensitive to prochloraz. This compounds appears in vitro more effective than flusilazole, propiconazole and azoxystrobin.