First Report of Powdery Mildew on Kenaf Caused by<i>Leveillula taurica</i>in the Lower Rio Grande Valley of Texas

Cook, C. G.; Riggs, J. L.

doi:10.1094/pd-79-0968d

Cited by 3 publications

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“…Considerable cross-infection amongst isolates from different hosts was reported (Palti, 1974(Palti, , 1988. The fungus was reported to occur on field and greenhouse crops in various parts of the USA (Forster, 1989;Cook & Riggs, 1995;Uchida et al, 1995;Damicone & Sutherland, 1999;McGrath et al, 2001;. Various reports suggest that L. taurica is an emerging plant pathogen in the Pacific Northwest region of the USA, affecting onions , field peppers , chickpea (Attanayake et al, 2008) and potatoes , as well as several previously unreported weed hosts Little, 2006, Sampangi et al, 2010 in other regions of the USA.…”

Section: Introductionmentioning

confidence: 99%

Powdery mildew (Leveillula taurica) on greenhouse and field peppers in Ontario – host range, cultivar response and disease management strategies

Cerkauskas

Ferguson

Banik

2011

Canadian Journal of Plant Pathology

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Leveillula taurica was observed on field pepper at various sites in south-western Ontario in [2005][2006][2007]. The field isolates collected from these sites were similar to a greenhouse isolate based on morphological observations. Host range of greenhouse and field isolates was similar, with minor sporulation on potato, carrot and several weeds. The greenhouse pepper cultivar 'Samanta' was the most susceptible to L. taurica while 'Triple 4', 'Duplo' and 'Bosanova' were the least susceptible to infection. Best control of pepper powdery mildew in the greenhouse was obtained with applications of myclobutanil, triflumizole, pyraclostrobin + boscalid, quinoxyfen, strobilurin derivatives (azoxystrobin, trifloxystrobin, kresoxim-methyl), copper soap, JMS Stylet-Oil ® , Valent-10118, acibenzolar-S-methyl and sulphur. Disease reduction was also obtained with applications of potassium bicarbonate, citrus oil + borax, Bacillus subtilis and a fermented milk byproduct + surfactant. K 2 HPO 4 + surfactant was effective in reducing disease whereas CaCl 2 + surfactant, fumed silica and Sporothrix flocculosa were not effective. In field plots, best disease control was achieved with applications of myclobutanil and the fermented milk byproduct + surfactant in 2006 whereas in 2007, citrus oil + borax and potassium bicarbonate were most effective. There were no significant differences in pepper yield among the treatments in field plots. In vitro survival studies showed that the fungus was able to survive in infected pepper leaves after exposure to temperatures of −10 • C for 2 months.

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