Isuluies of <i>Rhizoctonia cerealis</i> anastomosis group GAG-1 were obtained from sharp eyespot lesions on wheat and on barley culms and from diseased sugar beet seedlings. Isolates of <i>R. cerealis</i> were collected from a fields with crop rotation experiments: sugar beet-spring wheat-winter barley. In pathogenicity tests isolates of <i>R. cerealis</i> from sugar beet seedlings and from sharp eyespot lesions on wheat and barley were pathogenic to these crops. Isolates of <i>R. cerealis</i> from sharp eyespot lesions on wheat and barley caused severe damping-ofTof sugar beet. Isolates of <i>R. cerealis</i> from sugar beet seedlings also caused symptoms of sharp eyespot on wheat and barley. None of the wheat and barley isolates of <i>R. cerealis</i> tested caused root-rot on wheat or barley seedlings. Isolates of <i>R. cerealis</i> obtained from diseased plants of wheat, barley and sugar beet were similar in morphology of cultures and anastomosed with GAG-1 tester isolate. The relatinoship between anastomosis. colony characters, growth rate, hyphal diameter and pathogenicity of AG-4. AG-2-2 and AG-5 isolates obtained together with <i>R. cerealis</i> from diseased plants were also investigated.
Isolates of <i>Rhizttctonia</i> sp. with multinucleate and binucleate cells were obtained from sharp eyespot lesions on wheat culms in Olsztyn region. (NE Poland). These isolates were compared to isolates of AG-4 and GAG-1 testers with reference to cultural morphology of colony, growth rate, hyphal anastomosis and pathogenicity to wheat seedlings. The wheat binucleate isolates were similar in morphology of colonies and anastomosed with the <i>Ceratubasidium</i> anastomosis group GAG-1 tester isolates of <i>R. cerealis</i>. Growth rates on PDA ranged from 9 to 11 mm/24h for wheat isolates and from l to 11 mm/24 h for tester isolates GAG-1 of <i>R. cerealis</i>. The wheat multinucleate isolates were similar in morphology of colonies and anastomosed with <i>Rhizoctonia solani</i> Kühn group AG-4 tester isolate. <i>R. solani</i> AG-4 isolates were morphologically distinct from the <i>R. cerealis</i> isolates. These isolates on PDA were dark and grow rapidly (20-30 mm diam./24 h/20°C) and significantly contrasted with slowly growing white-creamy isolates of <i>R. cerealis</i> (GAG-1). Isolates of <i>R. solani</i> (AG-4) and <i>R. cerealis</i> (GAG-I) developed sharp eyespot lesions on culms and white head symptoms typical of the disease. None of the wheat isolates of <i>R. cerealis</i> (GAG-I) caused root-rot on wheat seedlings. In the present work the classification system of vegetative groups of <i>Rhizoctonia</i> spp. in present work is also discussed.
The causal agents of leaves and pods spot-pot of peas and field peas in the Olsztyn district was the fungus Phoma medicaginis var. pinodella. Investigated isolates of P. medicaginis var. pinodella differed by macroscopic and microscopic features. From diseases leaves and pods of peas and field peas obtained also saprophytic fungi among which Alternaria alternata, Botrytis cinerea, Cladosporium cladosporioides, Epicoccum purpurascens, Stemphylium botryosum, Sordaria fimicola and mycelia sterilia were dominated. In the study on the identification and distribution of pathotypes of P. medicaginis var. pinodella six pathotypes were identified among which pathotype 3 were dominated. The identified pathotypes differed by macroscopic and microscopic features
In the work the effect of culture filtrates of biotic series of 34 species of saprophytic fungi isolated from roots and root nodules of peas and field peas on the growth of <i>Rhizobium leguminosarum</i> was determined. The results obtained proved that the growth of <i>Rhizobium leguminosarum</i> was inhibited by culture filtrates of saprophytic fungi: <i>Aspergillus niger, A.flavus, Cephalosporium roseum, Cylindrocarpon radicicola, Fusarium oxysporum, F. solani, Glocladium roseum, Penicillium notatum, P. janthinellum, Trichoderma lignorum,</i> and <i>T. viride</i>.
The aim of the work was to find the plants resistant to Phoma medicaginis var. pinodella causing leaf spot-pot of peas and field peas. Fourty five cultivars of peas and field peas and 6 breeding materials were tested in field in the period 1975-1978 on artificially inoculated field plots. Cultivars: Jubilat, Paloma, Proteus, Uladowskij Jubilejnyj, Fioletowa, Nieznanicka and Rosacrone were to be less susceptible. In laboratory and greenhouse conditions peas and field peas cultivars were examined for susceptible to pathotypes 3 and 5 of Phoma medicaginis var. pinodella. The results obtained proved that cultivars: Auralia, Finale, Flavanda, Jubilat, Paloma, Proteus, Uladowskij Jubilejnyj, Nieznanicka and Rosacrone were to be less susceptible to two pathotypes of P. medicaginis var. pinodella
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