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New records of Pythium species in Pakistan

S. Shahzad and A. Ghaffar

The genus Pythium Pringsh., includes many plant pathogenic species which cause damping-off and root rot disease on important crops resulting in severe losses (PlaatsNiterink, 1981). Although reports of fungi like Macrophomina phaseolina (Tassi) Goid, Rhizoctonia solani Kühn, Fusarium spp., Sclerotium spp., and Sclerotinia spp., attacking under ground parts of crop plants in Pakistan have been made (Mirza & Qureshi, 1978; Shahzad & Ghaffar, 1986, 1990; Shahzad et al., 1988), Pythium spp., have received little attention. Of over 120 species of Pythium (Dick, 1990), P. aphanidermatum (Edson) Fitzpatrick from Capsicum annuum L. and unidentified Pythium sp., from soil have been reported form Pakistan (Mirza & Qureshi, 1978). During a survey of cultivated fields in different parts of Pakistan, P. aphanidermatum and P. periplocum Drechsler were isolated and identified after reference to Plaats-Niterink (1981) and Dick (1990).

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