Management of Alternaria macrospora causing alternaria leaf spot of cotton by plant extracts

Abstract

Among the seven plant extracts evaluated in vitro, Allium sativum (bulb extract) was most effective in inhibiting the mycelial growth (60.30 per cent) of Alternaria macrospora. The next best plant extracts were onion bulb extract, Ashoka leaf extract and sorghum leaf extract with mean mycelial inhibition of 57.54, 30.29 and 29.76 per cent, respectively. The least inhibition was shown by Eucalyptus leaf extract) which recorded mean mycelial inhibition of 15.06 per cent.