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 *
Department of Plant Pathology, Assam Agricultural University, Assam, India.
Nirmal Mazumder
Department of Plant Pathology, Biswanath College of Agriculture, AAU, Assam, India.
Pranab Dutta
School of Crop Protection, CPGSAS, CAU (Imphal), Umiam, Meghalaya, India.
Sailen Gogoi
Department of Horticulture, Assam Agricultural University, Assam, India.
Ruthy Tabing
Department of Plant Pathology, Assam Agricultural University, Assam, India.
Pranjal Kaman
Department of Plant Pathology, Assam Agricultural University, Assam, India.
*Author to whom correspondence should be addressed.
Abstract
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.
Keywords: Gerbera, Alternaria alternata, hexaconazole, org-trichojal