<i>Peronospora belbahrii</i> causing downy mildew disease on <i>Agastache</i> in the UK: a new host and location for the pathogen

Henricot, B.; Denton, J.O.; Scrace, J.; Barnes, A. V.; Lane, Charles R.

doi:10.1111/j.1365-3059.2010.02264.x

Cited by 10 publications

(3 citation statements)

References 2 publications

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“…Where the older plants showed more resistance to infection by downy mildew due to structural resistance The thickness of the cuticle increases as the plants age increases the thickening of the cell walls, which make it difficult to penetrate through the germ tubes of the pathogen. In contrast to plants in the younger stages, which were more susceptible to infection [34][35][36][37][38][39][40][41][42][43][44][45][46].…”

Section: Different Ages Response To Downy Mildewmentioning

confidence: 99%

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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Section: Different Ages Response To Downy Mildewmentioning

confidence: 99%

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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“…In 2009, the Agastache species (Lamiaceae) was also named as the new P. belbahrii host by Henricot et al [6]. The host range is today broadened and as alternative hosts are considered culinary and ornamental varieties related to basil and coleus from Lamiaceae family and here are mint (Mentha spp.)…”

Section: Plant Diseases-current Threats and Management Trendsmentioning

confidence: 99%

“…In summer 2009, it was detected in United Kingdom in Agastache (hyssop) plants (Agastache mexicana and Agastache sp.) at Wisley gardens (Surrey) and on the summer of 2010 in protected basil plants in south-east England [5,6]. In 2010, a significant incidence of downy mildew was reported in Hungary at two plant stands at Budapest-Soroksár and Tordasal though a similar disease had been observed in 2003 in a greenhouse at Albertirsa [7].…”

Section: Introductionmentioning

confidence: 99%

Downy Mildew of Basil: A New Destructive Disease Worldwide

Topolovec-Pintarić¹,

Martinko²

2020

Plant Diseases - Current Threats and Management Trends

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Oomycete pseudofungus (Peronospora belbahrii) is a causal of devastating basil downy mildew disease because once infected basil plants are no longer marketable. The host range is limited to basil and hyssop. Coleus was previously considered as host as well, but pathogen causing downy mildew on coleus has been shown genetically different and specified as P. belbahrii sensu lato. Therefore, P. belbahrii is described as a complex species, likely defined by plant host. The P. belbahrii is air-borne and seed-borne pathogen and it does not need a vector for dispersal. The disease was firstly reported from Africa where it is assumed to have originated on sweet basil and 70 years later it was reported from Europe. Currently, basil downy mildew is of pandemic occurrence and the pathogen is present in almost all areas around the world where basil is cultivated. Since the pathogen is transmitted by the seed, there is a high risk of the pathogen spread by the seed trade.

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Host range of Peronospora belbahrii, causal agent of basil downy mildew, in Israel

et al. 2019

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Peronospora belbahrii causing downy mildew disease on Agastache in the UK: a new host and location for the pathogen

Cited by 10 publications

References 2 publications

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

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

Downy Mildew of Basil: A New Destructive Disease Worldwide

Host range of Peronospora belbahrii, causal agent of basil downy mildew, in Israel

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