Occurrence of Downy Mildew (Peronospora belbahrii) of Sweet Basil (Ocimum basilicum L.) in Egypt

Hilal, A. A.; Ghebrial, Eman

doi:10.21608/ejp.2014.95594

Cited by 2 publications

(2 citation statements)

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“…Light microscopy revealed that while dichotomously branched sporangiophores with abundant spores were formed in the dark, abnormally branched sporangiophores, with no spores, were formed under light conditions where a degree of 12h /12h was recorded as the best light and dark hours, due to the fact that germination of sporangia needs darkness, while sporangiophores need light periods. This result agreed with [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33].…”

Section: Effect Of Light and Darkness Intervalssupporting

confidence: 85%

“…The disease emerged in Switzerland in 2001 [6], Italy in 2003 [8], France and Belgium in 2004 [9][10], South Africa and Malta in 2005 [11], Iran in 2006, Cameroon 2007 [12] and the United States in 2007 [13-14-15], Argentina in 2008, Cuba and Taiwan in 2009, Hungary and U.K. in 2010 [16][17], Israel and Canada in 2011 [18][19]., and the Czech Republic in 2012 [20], Currently, BDM occurs in all parts of the world where sweet basil is grown. In Egypt basil downy mildew, incited by P. belbahrii Thines, was observed for the first time especially in Beni Suef governorate in 2013 [21] it has become a serious disease in sweet basil and the rapid spread of the pathogen P. belbahrii throughout various herb production regions causing complete crop losses [22].…”

Section: Introductionmentioning

confidence: 99%

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Pathological and physiological studies of Downy Mildew of Basil (Ocimum basilicum) Caused by Peronospora belbahrii in Egypt

M.Abdullah

N.Fawzy²,

S.Eid³

et al. 2022

Benha Journal of Applied Sciences

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Basil is the most commercially significant medicinal and aromatic plant, used both fresh and dried, as well as a source of essential oil for perfume and food flavor manufacture. Basil's main composition includes a significant amount of antioxidants and antimicrobial agents. The obligate, biotrophic oomycete pathogen Peronospora belbahrii Thines causes basil downy mildew (BDM). It became a very destructive disease that has caused severe damage and crop loss of sweet basil in Egypt and worldwide. A field survey for disease severity (DS) and disease incidence (DI) of BDM was done in basil cultivation areas in Egypt during two successive growing seasons 2019-2020. The highest percentage of (DS) and (DI) of BDM was (93% and 100%) in 2019 and (95% and 100%) in 2020 in Nassir city of Beni Suef Governorate. Laboratory studies indicated that the highest percentage of spores germination was 33% at temperatures 18 o C and the lowest was 3% at 12 o C, while no spores germinated at 10 o C., the relative humidity percentages 100% and 95% were the most suitable for the highest germination percentage (35% and 33%). The effect of light and dark hours interval (12 hours of light and 12 hours of darkness) was the most suitable for the highest percentage of spores germination (30%). Pathogenicity test by detached leaves method explained that the sporangiophores of P. belbahrii appeared after two days from infection and the severity increased until the 4 th day when the whole leaf was infected. Pathogenicity test under greenhouse condition revealed that P. belbahrii severity and incidence reached (96.6 and 100%, respectively) 7 days post-inoculation in case of sowing basil (Baladi cv.) by seeds while in case of using transplants the disease severity and incidence reached (91.4 and 100%, respectively) at 10 days post-inoculation. The varietal reaction of some basil cultivars to BDM under greenhouse showed that Lemon Basil O. americanum var. citriodorum had the lowest disease severity and incidence (11.0% and 21.6%).

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