International Journal of Agriculture, Environment and Biotechnology
Citation: IJAEB: 8(1): 89-95 March 2015
DOI Number: 10.5958/2230-732X.2015.00012.1
©2015 New Delhi Publishers. All rights reserved
Field evaluation of fungicides against Alternaria porri (Ellis)
Cif., causing purple blotch of onion ( Allium cepa L.)
Archana S. Rao 1 *, Girija Ganeshan 1 , Ramachandra Y.L. 2 and Chethana B.S. 3
1 Indian Institute of Horticulture Research, Division of Plant Pathology, Hesaraghatta Lake Post, 560089, Benguluru, India
2 KuvempuUniversity, Department of Biotechnology, 577451, Benguluru, Karnataka, India
3 ARS, VCFarm, 571405, Mandya, India.
*Corresponding author:
Paper No. 296
Received: 30 June 2014
Accepted: 13 October 2015
Published: 25 March 2015
Field evaluation of several fungicides including new molecules was undertaken for the management
of purple blotch disease of onion caused by Alternaria porri (Ellis) Cif. The experiments were conducted
during kharif of 2012 and 2013 using susceptible variety Arka Nikethan.Cymoxanil 8% + Mancozeb 64%
WP @ 2500 ppm and Mancozeb 70% WP @ 2500 ppm were effective in reducing the disease severity by
54.86 and 52.88 % over untreated control. However, Mancozeb 70% WP and Cymoxanil 8% + Mancozeb
64% WP recorded the maximum yield of 39.71 and 37.06 t/ha and obtained benefit cost ratio of 33.85 and
20.67. Thus these two fungicides can be recommended for the effective and economical management of
the disease.
  • Mancozeb 70% WP and Cymoxanil 8% + Mancozeb 64% WP were the best fungicides for effective management
  • of economically important Purple blotch disease in onion.
    Keywords: Non-systemic fungicides, systemicfungicides, combination products
    Onion( Alliumcepa L.)is one of the five mostimportant
    field conditions.Alternaria blight is one of the most
    vegetable crops grown widely across the world. India
    devastating disease (Marmath et al. , 2013).Purple
    is a traditional grower and assumes second position
    blotch of onion caused by Alternaria porri (Elllis)
    in onion production with 86.34 million tonnes from
    Cif.,is a major disease affecting the foliage severely
    4.36 million hectares area (FAOSTAT 2013). Onion is
    resulting in crop loss ranging from 30 to 100 per
    cent. The disease may reach epidemic states during
    major onion growing states are Maharashtra (33%),
    the favourable conditions of high relative humidity
    Karnataka (17%), Gujarat (10%), Bihar (7%), Madhya
    (80-90%) and optimum temperature (24±10C) (Yadav
    Pradesh (7%), Andhra Pradesh (5%), Rajastan (3%),
    et al. , 2013). In view of importance of the crop and
    Haryana (3%) and others (15%) (Indian Horticulture
    effect of fungal disease on yield, there is a need
    Database 2011).Onion is susceptible for numerous
    for the development of effective control methods.
    pests and diseases throughout growing period under
    Though resistant cultivars would be most effective