scholarly journals Incidence of leaf spot disease on cotton caused by Curvularia verruculosa and role of its hydrolytic enzymes in pathogenesis

2018 ◽  
Vol 24 (4) ◽  
pp. 711-714 ◽  
Author(s):  
Leena P. Shirsath ◽  
Sandip P. Patil ◽  
Ulhas K. Patil
Keyword(s):  
Leaf Spot ◽  
Hydrolytic Enzymes ◽  
Leaf Spot Disease ◽  
Spot Disease ◽  
Curvularia Verruculosa

scholarly journals Antifungal Activity of the Bark Extract of Michelia Alba Against Curvularia Verruculosa Fungal the Cause of Leaf Spot Disease on Rice

2021 ◽  
Vol 14 (3) ◽  
pp. 1655-1659
Author(s):  
I Gusti Agung Gede Bawa ◽  
Ni Wayan Bogoriani
Keyword(s):  
Antifungal Activity ◽  
Leaf Spot ◽  
Bark Extract ◽  
Leaf Spot Disease ◽  
Biomass Formation ◽  
Antifungal Activities ◽  
Spot Disease ◽  
Curvularia Verruculosa ◽  
Fungal Colony

The purpose of this study was observe the antifungal activity of the bark extract of Michelia alba against Curvularia verruculosa fungal of the cause of leaf spot disease in rice. The antifungal activities was carried out using the diffusion well, colony, biomass formation methods. The bark extract of Michelia alba has showed the antifungal activity against Curvularia verruculosa fungal with a minimum inhibition concentratiotn value to be 0.5%. The bark extract of Michelia alba with 2.0% concentration can strongly inhibit the growth of C. Verruculosa with inhibiting capabality is 33.17 mm. This extract at 0.6% concentration was able to completely inhibit the growth of fungal colony and at 2.0% concentration has been able to inhibit completely the biomass formation of C. Verruculosa fungal for a 14-day period of incubation.

scholarly journals Cercosporin From Pseudocercosporella capsellae and its Critical Role in White Leaf Spot Development

Plant Disease ◽  
2016 ◽  
Vol 100 (8) ◽  
pp. 1521-1531 ◽  
Author(s):  
Niroshini Gunasinghe ◽  
Ming Pei You ◽  
Gregory R. Cawthray ◽  
Martin J. Barbetti
Keyword(s):  
Host Species ◽  
Leaf Spot ◽  
Critical Role ◽  
Chemical Extraction ◽  
Leaf Spot Disease ◽  
Raphanus Raphanistrum ◽  
Spot Disease ◽  
White Leaf ◽  
Pink Pigment

Pseudocercosporella capsellae, the causative agent of white leaf spot disease in Brassicaceae, can produce a purple-pink pigment on artificial media resembling, but not previously confirmed as, the toxin cercosporin. Chemical extraction with ethyl acetate from growing hyphae followed by quantitative (thin-layer chromatography [TLC] and high-performance liquid chromatography [HPLC]) and qualitative methods showed an identical absorption spectrum, with similar retardation factor (Rf) values on TLC papers and an identical peak with the same retention time in HPLC as for a standard for cercosporin. We believe this is the first report to confirm that the purple-pink pigment produced by P. capsellae is cercosporin. Confocal microscopy detected green autofluorescence of cercosporin-producing hyphae, confirming the presence of cercosporin inside hyphae. The highly virulent UWA Wlra-7 isolate of P. capsellae produced the greatest quantity of cercosporin (10.69 mg g−1). The phytotoxicity and role of cercosporin in disease initiation across each of three Brassicaceae host species (Brassica juncea, B. napus, and Raphanus raphanistrum) was also studied. Culture filtrates containing cercosporin were phytotoxic to all three host plant species, producing large, white lesions on highly sensitive B. juncea, only water-soaked areas on least sensitive R. raphanistrum, and intermediate lesions on B. napus. It is noteworthy that sensitivity to cercosporin of these three host species was analogous to their susceptibility to the pathogen, viz., B. juncea the most susceptible, R. raphanistrum the least susceptible, and B. napus intermediate. The presence of cercosporin in the inoculum significantly increased disease severity on the highly cercosporin-sensitive B. juncea. We believe that this is the first study to demonstrate that P. capsellae produces cercosporin in liquid culture rather than agar media. Finally, this study highlights an important role of cercosporin as a pathogenicity factor in white leaf spot disease on Brassicaceae as evidenced by the ability of the cercosporin-rich culture filtrate to reproduce white leaf spot lesions on host plants and by the enhanced virulence of P. capsellae in the presence of cercosporin.

scholarly journals First report of Curvularia verruculosa causing leaf spot disease of grape (Vitis vinifera) in Afghanistan

2020 ◽  
Vol 102 (4) ◽  
pp. 1337-1337
Author(s):  
Nasir Ahmed Rajput ◽  
Hussainullah ◽  
Chao Huo ◽  
JiFen Cao ◽  
Muhammad Atiq ◽  
...  
Keyword(s):  
Vitis Vinifera ◽  
Leaf Spot ◽  
Leaf Spot Disease ◽  
First Report ◽  
Spot Disease ◽  
Curvularia Verruculosa

scholarly journals The role of reactive oxygen in the development of Ramularia leaf spot disease in barley seedlings

2017 ◽  
Vol 121 (3) ◽  
pp. 415-430 ◽  
Author(s):  
Graham R D McGrann ◽  
James K M Brown
Keyword(s):  
Leaf Spot ◽  
Reactive Oxygen ◽  
Leaf Spot Disease ◽  
Spot Disease ◽  
Ramularia Leaf Spot

TWO NEW SEVERE LEAF SPOT DISEASE ON FOREST TREES OF JALGAON (MAHARASTRA) INDIA

2017 ◽  
Vol 23 (2) ◽  
Author(s):  
S. A. FIRDOUSI
Keyword(s):  
Leaf Spot ◽  
Fungal Disease ◽  
Leaf Spot Disease ◽  
Forest Trees ◽  
First Report ◽  
Spot Disease ◽  
Severe Leaf

During the survey of the forest fungal disease, of Jalgaon district, two severe leaf spot diseases on Lannae coromandelica and ( Ougenia dalbergioides (Papilionaceae) were observed in Jalgaon, forest during July to September 2016-17. The casual organism was identified as Stigmina lanneae and Phomopsis sp. respectively1-4,7. These are first report from Jalgaon and Maharashtra state.

Rapid Inoculation Technique and Biological Control of Leaf Spot Disease in Oil Palm

2019 ◽  
Vol 2 (1) ◽  
pp. 1-11 ◽  
Author(s):  
Delia Agustina ◽  
◽  
Cahya Prihatna ◽  
Antonius Suwanto ◽  
◽  
...  
Keyword(s):  
Biological Control ◽  
Oil Palm ◽  
Leaf Spot ◽  
Leaf Spot Disease ◽  
Inoculation Technique ◽  
Spot Disease

scholarly journals Registration of three peanut allotetraploid interspecific hybrids resistant to late leaf spot disease and tomato spotted wilt

2021 ◽  
Author(s):  
Ye Chu ◽  
H. Thomas Stalker ◽  
Kathleen Marasigan ◽  
Chandler M. Levinson ◽  
Dongying Gao ◽  
...  
Keyword(s):  
Leaf Spot ◽  
Interspecific Hybrids ◽  
Leaf Spot Disease ◽  
Late Leaf Spot ◽  
Spot Disease ◽  
Tomato Spotted Wilt
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