Abstract

ALVAREZ-RODRIGUEZ, Brando et al. Phytophthora hydropathica and Phytophthora drechsleri isolated from irrigation channels in the Culiacan Valley. Rev. mex. fitopatol [online]. 2017, vol.35, n.1, pp.20-39. ISSN 2007-8080.  https://doi.org/10.18781/r.mex.fit.1606-1.

Up to date, there are no reports of the presence of Phytophthora species in surface water bodies in Mexico, which represents a risk for the local agriculture. During January 2015, 25 irrigation channels from Culiacan Valley were sampled for the isolation of Phytophthora spp. Isolates were obtained with rhododendron leaves and pear fruits baits. Twenty-nine isolates of Phytophthora were obtained and identified, by morphological characteristics together with rDNA sequences of internal transcribed spacers (ITS) and elongation factor 1-α (TEF-1α). Pathogenicity tests were performed on tomato and pepper leaves, since they are important crops in the region and they are irrigated with water from the sampled channels. Two Phytophthora species were identified: P. hydropathica and P. drechsleri. Isolates of P. hydropathica caused necrotic lesions on tomato and pepper leaves while isolates of P. drechsleri caused necrotic lesions only on tomato leaves. To our knowledge, this is the first report of P. hydropathica in Mexico.

Keywords : irrigation water; oomycetes; bait; detection; pathogenicity.

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