Fitopatologia Brasileira (2006) 31, 195-198

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Maria de Fátima S. Muniz, Flávia Waleska R. de Andrade, Fátima M. Queiroz, Gilson Moura Filho and Maria Menezes (2006)
Caracterização de isolados de Phytophthora drechsleri, agente causal da podridão mole de raízes de mandioca
[Characterization of Phytophthora drechsleri, the causal agent of cassava soft root rot]
Fitopatologia Brasileira 31 (2), 195-198
Abstract: Nine Phytophthora isolates from cassava (Manihot esculenta) were characterized based on morphology and morphometry of propagative structures, growth at 10, 15, 20, 25, 30 and 35 ºC, and by evaluating its pathogenicity. Sporangia produced on nonsterile soil extract were ovoid, nonpapillate and persistent, formed in a sympodium or unbranched sporangiophores, 24.6 to 57.4 µm long x 14.8 to 37.7 µm wide, and length-breadth ratio was 1.0 - 2.6. Chlamydospores were rarely observed. Oospores produced in single spore culture on V8 agar medium were aplerotic, and 13.1 to 34.4 µm in diameter. Antheridia were amphigynous, measuring 8.2 - 24.6 µ x 8.2 - 19.7 µ ; oogonia ranged from 19.7 to 41.0 µm in diameter. Culture growth was greatest at 25 ºC in V8 agar medium. The isolates that were pathogenic to plants and detached roots of cassava were identified as Phytophthora drechsleri Tucker.
(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.


Phytophthora drechsleri Cassava (Manihot esculenta) Brazil (NE)