Influence of Host Plant and Isolate Source on Myrothecium Leaf Spot of Foliage Plants

Plant Disease ◽  
1983 ◽  
Vol 67 (6) ◽  
pp. 668 ◽  
Author(s):  
A. R. Chase
Keyword(s):  
Host Plant ◽  
Leaf Spot ◽  
Foliage Plants

scholarly journals Potassium and Phosphorus Deficiency Symptoms of Ixora

2000 ◽  
Vol 10 (2) ◽  
pp. 314-317 ◽  
Author(s):  
Timothy K. Broschat
Keyword(s):  
Leaf Spot ◽  
Phosphorus Deficiency ◽  
Sandy Soils ◽  
P Deficiency ◽  
Deficiency Symptoms ◽  
Foliage Plants ◽  
Landscape Plants ◽  
K Deficiency ◽  
Foliar Concentrations ◽  
Olive Green

Ixoras (Ixora L.) growing in calcareous sandy soils are highly susceptible to a reddish leaf spot disorder. Symptoms appear on the oldest leaves of a shoot and consist of irregular diffuse brownish-red blotches on slightly chlorotic leaves. Symptoms of K deficiency, P deficiency, and both K and P deficiency were induced in container-grown Ixora `Nora Grant' by withholding the appropriate element from the fertilization regime. Potassium-deficient ixoras showed sharply delimited necrotic spotting on the oldest leaves, were stunted in overall size, and retained fewer leaves per shoot than control plants. Phosphorus-deficient plants showed no spotting, but had uniformly brownish-red older leaves and olive-green younger foliage. Plants deficient in both elements displayed symptoms similar to those observed on landscape plants. Symptomatic experimental and landscape ixoras all had low foliar concentrations of both K and P.

scholarly journals Septorioza pomidora. I. Rozwój choroby w warunkach szklarniowych i polowych [Septoria leaf spot of tomato. I. Development of septoria leaf spot on tomato plants under greenhouse and field conditions]

2015 ◽  
Vol 30 (2) ◽  
pp. 341-358 ◽  
Author(s):  
J. Marcinkowska
Keyword(s):  
Host Plant ◽  
Leaf Spot ◽  
Field Conditions ◽  
Air Humidity ◽  
Inoculum Concentration ◽  
Tomato Plants ◽  
Central Poland ◽  
Plant Parasite ◽  
Septoria Lycopersici ◽  
Septoria Leaf Spot

The number of <i>Septoria lycopersici</i> pycnospores necessary for inducing tomato infection was reported. In addition to this, the influence of inoculum concentration and site of tomato infection as well as the influence of air humidity and temperature on diseasee expression have been researched. Studies upon the character of <i>S. lycopersici</i> penetration and host-plant parasite interaction were made with the susceptible Bounty tomato under greenhouse conditions. The results of observations concerning the appearance and development of septoria leaf spot in the fields of central Poland were also described.

Ascochyta sorghi. [Descriptions of Fungi and Bacteria].

1979 ◽  
Author(s):  
E. Punithalingam
Keyword(s):  
Sorghum Bicolor ◽  
Host Plant ◽  
Geographical Distribution ◽  
Leaf Spot ◽  
Crop Residues ◽  
Leaf Spots ◽  
Wet Weather ◽  
Indistinct Margin

Abstract A description is provided for Ascochyta sorghi. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Sorghum bicolor and wild sorghums. DISEASE: Rough leaf spot of sorghum. On leaves symptoms appear as small circular to oblong light coloured spots with well defined reddish margin. Older lesions become broadly elliptic, greyish to yellow brown or purplish red, reaching 4-9 × 8-14 mm. Lesions often merge with one another to form large irregular necrotic areas up to 12.5 × 2.5 cm and the whole leaves may be killed. The variety of host plant mostly determines whether the leaf spots have a distinct red margin or an indistinct margin (Tarr, 1962; Edmunds & Zummo, 1975). Lesions may also occur on leaf sheaths and sometimes on leaf stalks. The disease appears to be severe on young plants whilst older plants have been reported to be resistant to attack (13, 746). GEOGRAPHICAL DISTRIBUTION: Africa (Eritrea, Gambia, Ghana, Nigeria, Senegal, Sudan, Tanzania, Zaire); Asia (Burma, India); Europe (Italy); N. America (USA, Alabama, Georgia); USSR. TRANSMISSION: Infection has been claimed to be spread by air-borne conidia in wet weather or heavy dews and also by insects (Singh et al., 1951; Tarr, 1962; Edmunds & Zummo, 1975). The fungus has been reported to be carried over on crop residues of sorghum and debris in the soil (Singh et al., 1951; Edmunds & Zummo, 1975).

scholarly journals Septorioza pomidora. III. Patogeniczność Septoria lycopersici Speg. oraz podatność pomidora na ten grzyb [Septoria leaf spot of tomato. III. Pathogenicity of Septoria lycopersici Speg. and susceptibility of tomato to this fungus]

2015 ◽  
Vol 30 (2) ◽  
pp. 373-384
Author(s):  
J. Marcinkowska
Keyword(s):  
Host Plant ◽  
Leaf Spot ◽  
Tomato Plants ◽  
Septoria Lycopersici ◽  
Septoria Leaf Spot

The resultus of this study have indicated a lack of physioloigical specialization of <i>Septoria lycopersici</i> in Poland. The susceptibility of tomato plants to this fungus depending on the age of host plant and its variety, was also studied out.

scholarly journals Sensory assessment of Cercospora beticola sporulation for phenotyping the partial disease resistance of sugar beet genotypes

Plant Methods ◽  
2019 ◽  
Vol 15 (1) ◽  
Author(s):  
Erich-Christian Oerke ◽  
Marlene Leucker ◽  
Ulrike Steiner
Keyword(s):  
Disease Resistance ◽  
Sugar Beet ◽  
Host Plant ◽  
Hyperspectral Imaging ◽  
Leaf Spot ◽  
Quantitative Resistance ◽  
Cercospora Beticola ◽  
Specific Reference ◽  
Full Potential ◽  
Host Plant Suitability

Abstract Background Due to its high damaging potential, Cercospora leaf spot (CLS) caused by Cercospora beticola is a continuous threat to sugar beet production worldwide. Breeding for disease resistance is hampered by the quantitative nature of resistance which may result from differences in penetration, colonization, and sporulation of the pathogen on sugar beet genotypes. In particular, problems in the quantitative assessment of C. beticola sporulation have resulted in the common practice to assess field resistance late in the growth period as quantitative resistance parameter. Recently, hyperspectral sensors have shown potential to assess differences in CLS severity. Hyperspectral microscopy was used for the quantification of C. beticola sporulation on sugar beet leaves in order to characterize the host plant suitability / resistance of genotypes for decision-making in breeding for CLS resistance. Results Assays with attached and detached leaves demonstrated that vital plant tissue is essential for the full potential of genotypic mechanisms of disease resistance and susceptibility. Spectral information (400 to 900 nm, 160 wavebands) of CLSs recorded before and after induction of C. beticola sporulation allowed the identification of sporulating leaf spot sub-areas. A supervised classification and quantification of sporulation structures was possible, but the necessity of genotype-specific reference spectra restricts the general applicability of this approach. Fungal sporulation could be quantified independent of the host plant genotype by calculating the area under the difference reflection spectrum from hyperspectral imaging before and with sporulation. The overall relationship between sensor-based and visual quantification of C. beticola sporulation on five genotypes differing in CLS resistance was R2 = 0.81; count-based differences among genotypes could be reproduced spectrally. Conclusions For the first time, hyperspectral imaging was successfully tested for the quantification of sporulation as a fungal activity depending on host plant suitability. The potential of this non-invasive and non-destructive approach for the quantification of fungal sporulation in other host–pathogen systems and for the phenotyping of crop traits complex as sporulation resistance is discussed.

Phyllachora bakeriana. [Descriptions of Fungi and Bacteria].

1986 ◽  
Author(s):  
P. F. Cannon
Keyword(s):  
Puerto Rico ◽  
South America ◽  
Host Plant ◽  
Central America ◽  
Geographical Distribution ◽  
Leaf Spot ◽  
Tropical Species ◽  
Cassia Fistula

Abstract A description is provided for Phyllachora bakeriana. Information is included on the disease caused by the organism, its transmission, geographical distribution, and hosts. HOSTS: Known from Cassia fistula, C. hoffinanseggiana and C. inaequilatera. DISEASE: Causes a leaf spot of Cassia species. The disease is not significant in economic terms; it appears to be unsightly and not seriously damaging to the host plant. Little is known of its ecology. Being a tropical species it probably does not show marked seasonality, but ascomata seem to be most often mature in January or February. GEOGRAPHICAL DISTRIBUTION: Central America: Grenada, Jamaica, Puerto Rico. South America: Brazil; probably more widespread. TRANSMISSION: This has not been studied, but ascospores are probably dispersed in the air and directly infect leaves, in common with other Phyllachora species.

2012–2016 On-Farm Evaluation of Fungicide Programs for Peanut Disease Control in Hamilton County, Florida

EDIS ◽  
2017 ◽  
Vol 2017 (4) ◽  
Author(s):  
Keith W. Wynn ◽  
Nicholas S. Dufault ◽  
Rebecca L. Barocco
Keyword(s):  
Plant Pathology ◽  
Disease Control ◽  
Leaf Spot ◽  
Fungal Disease ◽  
White Mold ◽  
Stem Rot ◽  
Late Leaf Spot ◽  
Fact Sheet ◽  
On Farm ◽  
Hamilton County

This ten-page fact sheet includes a summary of various fungicide spray programs for fungal disease control of early leaf spot, late leaf spot, and white mold/stem rot of peanut in 2012-2016 on-farm trials in Hamilton County. Written by K.W. Wynn, N.S. Dufault, and R.L. Barocco and published by the Plant Pathology Department.http://edis.ifas.ufl.edu/pp334

Mango: A new host plant for the lycaeinid Anthene lycaenina lycaenina (R. Felder, 1868)

ENTOMON ◽  
2020 ◽  
Vol 45 (3) ◽  
pp. 237-238
Author(s):  
J. Nayanathara ◽  
R. Narayana
Keyword(s):  
Host Plant ◽  
New Host ◽  
First Time

Anthene lycaenina lycaenina (R. Felder, 1868) is reported on mango for the first time.

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.

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