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Dynamics of Alternaria blight [Alternaria spp.] spread on spring oilseed rape leaves and siliques and variation of the disease parameters under the effect of prochloraz and tebuconazole in relation to application time

100%

Brazauskiene I., Petraitiene E.

Journal of Plant Protection Research

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2003

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tom 43

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nr 4

313-324

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The occurrence of Alternaria blight [Alternaria ssp.] and Phoma stem canker [Phoma lingam] on oilseed rape in central Lithuania and pathogenic fungi on harvested seed

100%

Brazauskiene I., Petraitiene E.

Journal of Plant Protection Research

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2006

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tom 46

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nr 3

295-311

Field surveys were performed in winter and spring rape crops of agricultural companies and individual farmers during the period of 2001–2003. A questionnaire was completed for each experimental field, giving a description of the crop. The incidence and severity of fungal diseases were estimated annually in 14–18 winter and spring rape crops. Seed samples were taken from each field and composition fungal communities on harvested seed was estimated. Alternaria blight and Phoma stem canker were present on stems of all investigated winter and spring rape cultivars and Alternaria blight occurred on siliques in all experimental years. In 2001, most favourable year for spread of diseases, Alternaria blight damaged 87.2 100% of winter rape and 100% of spring rape siliques, maximum disease severity was 6.66 and 7.24%, respectively. All cultivars of winter and spring rape were susceptible to Alternaria blight. Phoma stem canker was more often found on stems of spring oilseed rape – up to 98% of stems with symptoms of Phoma stem canker. Seed fungal infection level was 10.0–100% in winter rape and 16.0–93.6% in spring rape seed samples. The most frequent fungi on seeds of winter and spring oilseed rape were Alternaria spp. and Cladosporium spp.

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The occurrence of pathogenic fungi during flax growing season in Central Lithuania

80%

Gruzdeviene E., Brazauskiene I., Repeckiene J., Lugauskas A.

Journal of Plant Protection Research

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2008

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tom 48

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nr 2

255-265

Experiments designed to study the variation of diversity of pathogenic fungi occurring in fibre flax agrocenosis during the growing season were conducted at the Lithuanian Institute of Agriculture Upytė Experimental Station during 1999-2002. The Upytė Experimental Station is situated in Central Lithuania. Phytopathological analyses of seed, soil and plants were done at the laboratory of the Upytė Experimental Station as well as at the Biodestructor Research Laboratory of the Institute of Botany. There were identified in the rhizosphere 9 fungal species belonging to 9 genera. On flax seedlings were identified fungi belonging to 13 genera. On flax leaves at green maturity stage was identified only Oidium lini. On flax stems at green maturity stage were identified fungi belonging to 12 genera. On mature flax stems were found fungi belonging to 15 genera. On flax seed during the experimental years were identified fungi belonging to 16 genera. The number of fungi identified on seeds varied each year, depending on the year's weather conditions during the seed ripening period. Having summarised the results, we can assert that pathogenic fungi Fusarium spp. and Colletotrichum lini, were found both on seed and plant vegetative parts during the whole assessment period. Species composition of fungi present on seed differed depending on the weather conditions. A larger number and more diverse species were found on the seed that ripened during the years with wet growing seasons (2000 and 2001) whereas the seed that ripened during dry growing seasons (1999 and 2002) was less infected with fungi. The spread of fungi on stems and leaves was also determined by the weather conditions. Many species of fungi were identified in 2001, when flax crops were lodged; stems and capsules were damaged by hail, and in 2000, when there was much rainfall.

Ograniczanie wyników

3 Journal of Plant Protection Research

3 Brazauskiene I.

2 Petraitiene E.

1 Gruzdeviene E.

1 Lugauskas A.

1 Repeckiene J.

1 2008

1 2006

1 2003

Dynamics of Alternaria blight [Alternaria spp.] spread on spring oilseed rape leaves and siliques and variation of the disease parameters under the effect of prochloraz and tebuconazole in relation to application time

The occurrence of Alternaria blight [Alternaria ssp.] and Phoma stem canker [Phoma lingam] on oilseed rape in central Lithuania and pathogenic fungi on harvested seed

The occurrence of pathogenic fungi during flax growing season in Central Lithuania