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International Journal of Pure & Applied Bioscience (IJPAB)
Year : 2018, Volume : 6, Issue : 2
First page : (232) Last page : (237)
Article doi: : http://dx.doi.org/10.18782/2320-7051.6042

Screening of Tuberose Cultivars and Effect of Fungicides against Tuberose Leaf Spot Caused by Alternaria polyanthi

T. Naga Lakshmi1*, C. Madhumathi3, R. Nagaraju2 and D. Sreedhar2
1AICRP on Fruits, 2Horticulture Research Station, 3College of Horticulture,
Dr. Y.S.R. Horticultural University, Anantharajupet – 516105, YSR District, Andhra Pradesh
*Corresponding Author E-mail: byralakshmi@gmail.com
Received: 28.11.2017  |  Revised: 31.12.2017   |  Accepted: 5.01.2018  


Six systemic fungicides viz., azoxystrobin, pyraclostrobin, difenconazole, hexaconazole, propiconazole, tebuconazole  and three non-systemic fungicides viz., chlorothalonil, copper oxy chloride and mancozeb were tested against Alternaria polyanthi at three different concentrations  using poison food technique. Among the systemic fungicides hexaconazole (Contaf 5 EC), propiconazole (Tilt 25 EC), tebuconazole (Folicur 25 EC) and pyraclostrobin (Cabriotop 60 WG) (0.1%) showed 100 percent inhibition of the fungus at 1000 ppm, while among the non-systemic fungicides, chlorothalonil at 2000 ppm, was found the best in inhibiting the growth of A.polyanthi with 52. percent inhibition. Eleven varieties of tuberose were screened against Alternaria leaf spot (Alternaria polyanthi) under field conditions. Out of eleven cultivars, none of them was found resistance or immune, while three cultivars viz., Arka Nirantara (13.14%), GKTC-4 (16.48%) and  Hyderabad Double (19.91%) were found to be moderately resistant  (category II) and seven cultivars viz., Sikkim (22.86%),  Phule Rajini (24.01%), Calcutta single (30.75%), Prajwal (32.50%), Rajith Rekha (32.57%), Sringar (34.14%) and Vaibhav (34.73%) were found moderately susceptible (category III). The local susceptible check recorded highest with per cent leaf area infection 43.5% (category IV).

Key words: Tuberose, Screening, Leaf spot, Alternaria polyanthi, Fungicides.

Full Text : PDF; Journal doi : http://dx.doi.org/10.18782

Cite this article: Lakshmi, T.N., Madhumathi, C., Nagaraju, R. and Sreedhar, D., Screening of tuberose cultivars and effect of fungicides against tuberose leaf spot caused by Alternaria polyanthi, Int. J. Pure App. Biosci.5(6): 232-237 (2017). doi: http://dx.doi.org/10.18782/2320-7051.6042

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