Occurrence of races and pathotypes of cucurbit powdery mildew in southeastern Spain |
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| Authors: | D del Pino Laura Olalla A Pérez-García María Eugenia Rivera Susana García R Moreno A de Vicente J A Torés |
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| Institution: | (1) Depto. de Microbiología, Facultad de Ciencias, Universidad de Málaga, E-29071 Málaga, Spain;(2) Estación Experimental “La Mayora”, C.S.I.C., Algarrobo-Costa, E-29750 Málaga, Spain;(3) Depto. de Sanidad Vegetal, Junta de Andalucía, Torre de Benagalbón, E-29738 Málaga, Spain;(4) Centro de Investigación y Formación Agraria, Junta de Andalucía, Churriana, E-29140 Málaga, Spain |
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| Abstract: | The causal agent of cucurbit powdery mildew in southeastern Spain has been investigated since 1996. Of the 139 single-spore
isolates obtained, all were identified asSphaerotheca fusca. Four physiological races (1, 2, 4 and 5) of the pathogen were detected. During the survey, a population shift ofS. fusca was observed: race 1 was progressively replaced by other races. In addition, race coexistence was observed in several cucurbit
greenhouses. Four host range patterns or pathotypes were distinguished among the isolates ofS. fusca. All isolates were highly aggressive on melon and especially on zucchini cultivars. No clear relationships between races
and pathotypes could be established, although isolates virulent on watermelon were preferentially associated with race 1.
These data show an apparent heterogeneity ofS. fusca populations in southeastern Spain that should be analyzed further.
http://www.phytoparasitica.org posting Aug. 9, 2002. |
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| Keywords: | Cucumber melon pumpkin watermelon zucchini host range physiological races Sphaerotheca fusca |
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