First Report of Crown Rot Caused by <i>Phytophthora tropicalis</i> on Gloxinia in North Carolina

Olson, H. A.; Benson, D. M.

doi:10.1094/php-2010-0708-03-br

Cited by 3 publications

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References 5 publications

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“…Recently described in 2001, P. tropicalis was found on gloxinia, potbos, and verbena in this survey (2). Tbis species bas been reported with increasing frequency on ornamental hosts (11,19,22,24,35,37). In particular, P tropiccdis has caused significant problems in the production of pothos (33,37).…”

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confidence: 58%

Characterization of Phytophthora spp. on Floriculture Crops in North Carolina

Olson

Benson

2011

Plant Disease

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Olson, H. A., and Benson, D. M. 2011. Cbaracterization of Phytophthora spp. on floriculture crops in Nortb Carolina. Plant Dis. 95:1013-1020.Isolates of Phytophthora in floriculture crops were collected from North Carolina commercial greenhouse facilities in 2t)()7 and 2008, identified, and characterized for mating type and mefenoxam sensitivity. In all, 163 isolates from 13 host species at 11 locations were identified primarily as Phytophthora nicotianae (59%), P. drechsleri (23%), P. cryptogea (9%), and P. tropicalis (4%). Multiple Phytophthora spp. were found at five locations. DNA sequencing was more reliable for differentiating P. cryptogea and P. drechsleri. Only tbe A1 mating type of P. drechsleri was collected; bowever, both mating types of P. nicotianae. P. cryptogea, and P. tropicalis were found. Overall, 66% of Phytophthora isolates were resistant or intermediate in resistance to mefenoxam at 1 (jg a.i./ml. Tbree groups of P. drcchsleri isolates had effective concentration of mefenoxam providing 50% growth inhibition (EC51,) estimates over 7(K) \ig a.i./ml. EC,n estimates for P. nicotianae ranged from 246 to 435 |jg a.i./ml. Isolates of P. nicotianae exbibited phenotypic heterogeneity at several locations, suggesting multiple separate introductions to tbe facilities. In contrast, P. nicotianae and P. drechsleri isolates from two locations were pbenotypically identical to a previous survey, suggesting tbat tbe facilities bave Phytophthora spp. established onsite.

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