Email this article Morphological variability and sensitivity of Phytophthora capsici causing wilt in bell pepper in Chihuahua, Mexico
Abstract
Mexico is the main exporter of bell pepper (Capsicum annuum) worldwide. The crop is affected by several diseases being wilt caused by Phytophthora capsici one of the most important. This phytopathogen has high variability in virulence and sensitivity to fungicides. There are no studies on populations of P. capsici from bell pepper in Mexico. The objective of this study was to determine the diversity of isolates of P. capsici obtained from bell pepper plants with wilt from Delicias, Chihuahua, Mexico by phenotypic markers: colony pattern, compatibility type, virulence and sensitivity to fungicides. The types of colony observed were: stellate (74%), slightly petaloid (14%) and radial (12%). Sensitive isolates were detected (53%), with intermediate sensitivity (42%) and insentive (5%) to mefenoxam. The 86.6% of the isolates inoculated were highly virulent, causing symptoms four days after inoculation. Both mating types (MT) A1 and A2 were detected. Oospore formation in planta was achieved inoculating both MT found in the same plant. The results suggest that there is sexual reproduction in the field and as a consequence diversity among the isolates of P. capsici, which cause wilt in bell pepper crops from Delicias, Chihuahua, Mexico.
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DOI: http://dx.doi.org/10.18781/R.MEX.FIT.1904-4
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