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Ghatak, Abhijeet
- Variability in Sensitivity among Different Host Origin-Macrophomina phaseolina Isolates to Azoxystrobin Fungicide
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Affiliations
1 Department of Plant Pathology, Bihar Agricultural University, Sabour, Bhagalpur (Bihar), IN
2 Pulses Research Center, Mokama (Bihar), IN
3 Jute Research Station, Katihar (Bihar), IN
1 Department of Plant Pathology, Bihar Agricultural University, Sabour, Bhagalpur (Bihar), IN
2 Pulses Research Center, Mokama (Bihar), IN
3 Jute Research Station, Katihar (Bihar), IN
Source
International Journal of Plant Protection, Vol 10, No 1 (2017), Pagination: 26-33Abstract
The charcoal rot fungus, Macrophomina phaseolina, was isolated from chickpea, pigeonpea, groundnut and jute ischolar_main tissues collected from Bihar and Uttar Pradesh. Variability in isolates was recognized i.e. feathery growth for pigeonpea and jute isolates, and restricted growth for chickpea and soybean isolates. The sensitivity of M. phaseolina from the four hosts was tested for azoxystrobin, a respiration inhibitor (QoI group) fungicide. The minimum inhibitory concentration was lower (10 ppm) for isolates with restricted growth and higher (between 100 and 150 ppm) for isolates with feathery growth. Concentrations of this fungicide pose significant impact (P < 0.01) on time requirement for growth of isolate. We found strong effectiveness of azoxystrobin to inhibit the growth of slow-growing population of M. phaseolina. Moreover, this fungicide can also exploit for the fast-growing population of M. phaseolina but more time will be required, to act on such isolates, for better result of azoxystrobin. Our results indicate that the response of different isolates varied to concentrations of azoxystrobin; this could be interpreted that the fungicidal application may be performed only after the quantitative estimation of the prevailing population type in the field as because various populations of M. phaseolina may be available in an area. Therefore, our results advocate for judicious use of fungicide (azoxystrobin) application, which ultimate restrict the hazardous impact on soil health.Keywords
Azoxystrobin, Charcoal Rot, Fungicide, Macrophomina phaseolina.
References
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- Biofumigation:A Control Method for the Soil-Borne Diseases
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Authors
Affiliations
1 Department of Plant Pathology, Bihar Agricultural University, Sabour, Bhagalpur (Bihar), IN
1 Department of Plant Pathology, Bihar Agricultural University, Sabour, Bhagalpur (Bihar), IN
Source
International Journal of Plant Protection, Vol 10, No 2 (2017), Pagination: 453-460Abstract
The term ‘biofumigation’ was originally coined by J.A. Kirkegaard to describe the process of growing, macerating / incorporating certain Brassica or related species into the soil, leading to the release of isothiocyanate compounds (ITCs) through the hydrolysis of glucosinolate (GSL) compounds contained in the plant tissues (Kirkegaard et al., 1993). This can result in a suppressive effect on a range of soil borne pests and diseases. Biofumigation is the suppression of soil born pests and diseases through the use of plants that produce inhibitory chemicals, also known as secondary metabolites. In most cases these biofumigant plants are chopped and incorporated into the soil so they can release their inhibitory chemicals.Keywords
Biofumigation, Soil-Borne Diseases.References
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- Assessing Fungicides for Seedling Protection of Cucumber to Collar Rot Disease Caused by Sclerotium rolfsii
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Authors
Affiliations
1 Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia (W.B.), IN
2 Department of Plant Pathology, Bihar Agricultural University, Sabour (Bihar), IN
1 Department of Plant Pathology, Bidhan Chandra Krishi Viswavidyalaya, Mohanpur, Nadia (W.B.), IN
2 Department of Plant Pathology, Bihar Agricultural University, Sabour (Bihar), IN
Source
International Journal of Plant Protection, Vol 11, No 1 (2018), Pagination: 10-17Abstract
Sclerotium rolfsii Sacc. is known to be a serious pathogen on many crops of economic importance including cucurbits. Due to proliferic growth and ability to forming sclerotia, this pathogen is the major constraint in successful cultivation of cucumber. The present investigation was thus carried out to evaluate the potential of nine different fungicides i.e. carbendazim, thiophenate methyl, vinclozoline, captan, copper oxychloride, mancozeb, hexaconazole, mycobutanil and propiconazole at different concentrations of 10, 50, 100 and 150 ppm, on the growth inhibition of S. rolfsii. The primary assessment was made on in vitro screening of fungicides and its concentration whereby hexaconazole at lowest concentration (10 ppm) rendered the most vital effect (P≤0.0001) on growth reduction ability followed by propiconazole and mycobutanil. No growth of S. rolfsii observed on plates amended with hexaconazole when the concentration was further increased. Similar effect was traced in an experiment conducted on ischolar_main trainer. The percent infected plant also provided the same impact of fungicides received in toxic-assay experiment. Maximum seedlings protection of cucumber was achieved through seed application of hexaconazole even at lowest concentration (P≤0.01); similarly, no mortality was detected on higher concentration of this fungicide. Although our result directly claiming the best effect of hexaconazole but we propose to use a combination of fungicides from different groups in order to avoid resistance development in S. rolfsii against a particular fungicide. A combination of carbendazim and hexaconazole is hereby proposed for seedling protection of cucumber to S. rolfsii.Keywords
Collar Rot, Cucumber, Fungicide, Sclerotium rolfsii, Seedling Protection.References
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