Screening of Kharif onion varieties against Pythium spp. and Alternaria porri
Keywords:Damping-off, onion varieties and purple blotch.
AbstractOnion (Allium cepa L.) is one of the commonly used vegetable cum spices in India. Around 34.93 lakhÂ tonnes of onion were exported from India during the year 2016-17. Damping-off and purple blotch causedÂ by Pythium spp. and Alternaria porri (Ellis) Cif. are the widespread fungal diseases consequences yieldÂ loss ranging from 2.5 to 97 per cent in onion. Being an important export-oriented vegetable; the diseasesÂ reduce the economic yield of the crop. Keeping this in view, the present experiment was carried out toÂ identify the resistant varieties of onion during the Kharif season. The field experiment was laid out in theÂ randomized block design with nineteen onion varieties and replicated twice. Results from the experimentÂ revealed that none of the evaluated genotypes were found under immune or resistant. However, PhuleÂ Samartha was moderately resistant and sixteen varieties viz. Bhima Raj, Bhima Red, Bhima Super, BhimaÂ Dark Red, Bhima Subhra, Bhima Safeda, Arka Niketan, Arka Kalyan, Arka Pragati, N-2-4-1, Baswant-780,Â NHRDF Red (L-28), Agrifound Dark Red, Pusa White Flate, Pusa White Round and N-53 were under theÂ category of moderately susceptible and two varieties viz. Sukha Sagar and Bhima Sweta were susceptible toÂ fungal diseases like damping-off and purple blotch. The variety, namely Bhima Raj was found significantlyÂ superior with respect to yield.
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