Eco-friendly Management of Alternaria Leaf Spot of Gerbera (Gerbera jamesonii Bolus ex. Hooker F) Caused by Alternaria alternata (Pers.; Fr.) in North East India
Bishal Saikia, Nirmal Mazumder, Pranab Dutta, Sailen Gogoi, Ruthy Tabing, Pranjal Kaman
International Journal of Plant & Soil Science · pp. 159–175 · Published 9 Apr 2026
10.9734/ijpss/2026/v38i46039Abstract
Gerbera (Gerbera jamesonii Bolus ex. Hooker F) includes the family Asteraceae, is an enormous and extremely profitable cut flower, which is grown in a wide range of environmental conditions globally. Based on in vitro studies the highest percentage of mycelial growth inhibition was seen in Allium sativum (10% conc.) and T. harzianum (86.66% and 81.38%), respectively. Concurrently, Hexaconazole (0.1%) showed a maximum mycelial growth inhibition of 100.00% against A. alternata. The in vivo field experiments were conducted for two seasons at Horticulture experimental farm, AAU, Jorhat-13 in the year 2022 and Hexaconazole (0.1%) were recorded lowest disease incidence (16.52%) and per cent disease severity (11.76%) with highest per cent disease reduction (79.43% and 85.59%) of leaf spot caused by A. alternata. When gerbera was treated with T. harzianum [Org-Trichojal (@ 5ml/l)], the yield-attributing traits and growth parameters gradually enhanced.
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