Alternaria alternata leaf spot

Alternaria brassicae, a necrotrophic pathogen, causes Alternaria Leaf Spot, one of the economically important diseases of Brassica crops. Many other Alternaria spp. such as A. brassicicola and A. alternata are known to cause secondary infections in the A. brassicae-infected Brassicas.

13p vijeeni2711 24-07-2021 7 0   Download

Study on fungal leaf spot diseases of gladiolus (Gladiolus grandiflorus) in Prayagraj city was assessed in the year 2019 and 2020. A survey was conducted in Prayagraj city among different varieties during their active growth period of gladiolus which revealed the incidence of Curvularia leaf spot and Alternaria leaf spot to be the predominant diseases of the crop.

7p cothumenhmong11 11-05-2021 11 1   Download

To study the effect of different fungicides against Alternaria leaf spot of ber, fungus was isolated from the infected leaves of ber plant and cultural and morphological study was done through Poison Food Technique to find that the fungus was Alternaria alternata having branched and septate mycelium with light brown to blackish conidiophores in acropetal chain and the conidia having olive green to dark brown colour with transverse and longitudinal septa.

6p trinhthamhodang11 27-04-2021 15 1   Download

The present investigation aims ultimately to find out to management strategy for leaf spot of ber disease that suits agroclimatic conditions of the country. In the absence of stable management strategy, use of resistant varieties, against Alternaria leaf spot of ber is the only recommendation for the management of leaf spot of ber.

6p chauchaungayxua10 18-03-2021 7 2   Download

Leaf spot disease (Alternaria alternata) causes severe foliar damage to niger crop. The isolates of A.alternata were collected from different location and tested for their variability in term of morphological, cultural and pathological variation viz., growth rate, colony colour, aerial mycelium colour, growth pattern, sporulation, conidial size, conidial sepation. In case of growth rate Aa1 and Aa2 was observed very fast growing it cover 70- 73 mm growth within 7 days of inoculation on PDA media.

7p trinhthamhodang9 16-12-2020 14 2   Download

Studies were conducted to know the efficacy plant extracts and bio-agents against Alternaria leaf spot of blond psyllium/isabgol (Plantago ovata Forssk.) caused by Alternaria alternata which has become an severe problem in isabgol growing areas of Rajasthan.

6p angicungduoc8 07-11-2020 9 1   Download

Calotropis procera (Aiton) W.T. Aiton. (Asclepiadaceae) commonly known as Madar or’Aak’ is a medicinally important wild shrub native to India useful in treatment of a number of illnesses including dysentery,intermittent fevers, cold, cough, and asthma. We observed a serious leaf spot disease of madar growing on wasteland sites near about AUH in the Panchgaon, Manesar- Gurgaon (Haryana) in year onward 2014. In January and February 2017...

5p trinhthamhodang7 31-08-2020 12 1   Download

Pomegranate (Punica granatum L) is one of the important fruit crops grown in India. Leaf spot of pomegranate caused by Alternaria alternata (Fr.) Keissler has becoming a major limiting factor in cultivation of pomegranate in some regions of India. The present investigation was carried out to test the efficacy of bio-agents and botanicals in vitro. All the seven fungal and two bacterial antagonists tested, exhibited significant mycelial growth inhibition of A. alternata. However, T. viride recorded significantly highest mycelial growth inhibition (86.

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Chilli is one of the important spices and cultivated around the world for its peculiar hot taste. Chilli leafs prone to affect by Alternaria alternata (leaf spot). In order to overcome this problem, efforts have been made to evaluate the efficiency of the bio-control agent Trichoderma harzianum for controlling the leaf spot disease in chilli. Trichoderma harzianum was isolated from the field soil and identified through microscopic and recommended standard methods.

9p angicungduoc5 12-06-2020 14 2   Download

Pomegranate (Punica grantum L.) is a high value commercial horticultural crop grown extensively throughout Maharashtra. Among the different diseases on pomegranate Alternaria leaf and fruit spot caused by Alternaria alternata (Fr.) Keissler, is becoming a serious and emerging problem to growers in Maharashtra. Therefore, in present studies fungicides (six systemic, five non systemic and two combi fungicides) were tested in vitro against A. alternata.

7p angicungduoc5 12-06-2020 8 1   Download

Biotic and abiotic stresses are major constraints in the production of groundnut. Among biotic stresses apart from bacterial and viral diseases, many fungal diseases are of economic importance. The major fungal diseases are Early leaf spot (Cercospora arachidicola), Late leaf spot (Cercosporidium personatum), Rust (Puccinia arachidis), Botrytis blight (Botrytis cinera), Aflarot/Yellow mould (Aspergillus flavus), Damping off (Pythium spp.

7p nguathienthan5 04-06-2020 16 0   Download

A Alternaria leaf spot (ALS) and flower heads spot (FHS) disease of Heliconia rostrata plants is prevalent in India. Heliconias plants are known for their beautiful, brilliant colorful flowering bracts. Breathtaking and unusual flower heads (bracts) rise from clumps of banana like leaves, sometimes very large or slender. They are also known as the birds of paradise which are found mostly in Indian gardens. Symptomatic can be seen on the leaves and flower heads like to be small and circular spots with concentric rings at first which later became irregular lesions.

5p trinhthamhodang1213 02-06-2020 13 1   Download

Lepidium sativum an important medicinal plant with immense pharmacological properties has been observed to be generally affected by many fungal pathogens in India particularly Alternaria alternata characterized by the appearance of brown necrotic spots on the leaf margin affecting the herb yield.

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Leaf blight was observed in anthurium crop in Tamil Nadu and Kerala states of India during 2011-2012. Initially, the symptoms were small circular to irregular brown spots with concentric rings on the leaves that gradually enlarged. Fungal isolates, obtained from infected leaf tissues were grown in pure culture and on the basis of cultural and morphological characteristics and ribosomal DNA spacer sequences, the organism was identified as Alternaria alternata (Fr.) Keissler. To our knowledge this is the first report of Alternaria leaf blight disease in Anthurium andraeanum in India.

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Alternaria leaf spot caused by Alternaria alternata is one of the important foliar diseases of brinjal (Solanum melongena L.) The present study on severity of Alternaria leaf spot of brinjal in Kashmir valley was conducted during kharif 2016. An extensive survey was conducted in three districts of Kashmir valley viz., Anantnag, Baramulla, and Budgam revealed that disease was prevalent in all the three districts with mean disease incidence and intensity of 30.76 and 9.77 per cent, respectively. The maximum disease incidence of 38.68 and intensity of 14.

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Lehsua (Cordia myxa Roxb.), also known as Lasoda, Gunda and Indian cherry, is a major fruit of the family Boraginaceae. To manage the disease, efficacy of plant extracts and fungicides were tested in vitro and in vivo against Alternaria alternata, causing Alternaria leaf spot.

8p chauchaungayxua4 18-03-2020 8 1   Download

The present study was on identification of Alternaria alternata which responable for Alternaria leaf spot in Asalio. The disease was found to be very severe in all Asalio growing areas causing heavy destruction. The main aim of this study clearly demonstrated that A. alternata is a primary pathogen in Asalio, causing a leaf-spot disease. Isolates of Alternaria sp. were collected from leaf spot disease infected samples of Asalio in the fields around Udaipur.

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Growing inclination towards Zero Budget Natural farming (ZBNF) in India to reduce expenditure on external input and to reduce indebtness of farmers, a study was under taken on evaluation of Jeevamrut, prepared by mixing cow dung, cow urine, pulse flour, jaggery and soil, and its constituents for management of Alternaria leaf spot caused by Alternaria alternata in organic mungbean under cage house condition as well as against the pathogen in-vitro, as the disease is quite destructive in all mungbean growing areas of southern Rajasthan.

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The efficacy of seven fungicides and seven bio pesticides were evaluated invitro against isolates of A. alternata, among the different fungicides tested, the maximum inhibition was recorded by hexaconazole (0.1%) with of 97.84 per cent inhibition, followed by propiconazole (96.31%) and tebuconazole (94.45%) and the least inhibition was recorded by carbenazime with 40.94 per cent. Among different isolates the 100 per cent inhibition was recorded by many isolates against triazole fungicides and the least inhibition was recorded by isolate Aa353 on Chlorothalonil (0.2%).

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A leaf spot disease of Yucca plants is prevalent in India. They are native to the hot and dry parts of America and the Caribbean. Yucca is similar to agave but often forms trunks and typically has more numerous, thinner, leathery leaves with a smaller terminal spine. Yucca leaves range in color from deep green to pale blue, and leaves may be striped in shades of white, cream, yellow, or chartreuse. They are also used in pharmaceutical industries for medicinal properties When in flower yucca produces large, upright panicles (flower clusters) of white, bell-shaped flowers.

3p nguaconbaynhay1 04-12-2019 12 1   Download