Fitopatologia Brasileira (2007) 32, 261-265

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Maria de Lourdes R. Duarte, Fernando C. Albuquerque, Rosa Maria V. Sanhueza, Jaqueline R. Verzignassi and Norio Kondo (2007)
Etiologia da podridão do coleto de Brachiaria brizantha em pastagens da amazônia
[Etiology of collar rot of Brachiaria brizantha cv. marandu in Amazonian pastures]
Fitopatologia Brasileira 32 (3), 261-265
Abstract: Amazonian pastures formed with Brachiaria brizantha Marandu cultivar (also known as 'Braquiarão') have been devastated by a new disease since 1995, whose typical symptoms are diseased plants dispersed in pastures. Four Pythium and one Rhizoctonia isolates were recovered from plants in the early stages of infection and infected seeds,. The results of the pathogenic tests showed P. periilum as the main pathogen. Inoculations of healthy plants with the pathogen alone or in mixture resulted in a high rate of disease (p<0.01) when P. periilum and R. solani were present in 'Braquiarão' plant tissues, showing that both pathogens are associated. This is the first report of P. periilum as the primary agent of collar rot on B. brizantha.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
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Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Rhizoctonia solani Brachiaria (crop) Brazil (NE)
Pythium periilum Brachiaria (crop) Brazil (NE)