Int.J.Curr.Microbiol.App.Sci (2019) 8(12): 2924-2931 2924 Original Research Article https://doi.org/10.20546/ijcmas.2019.812.339 In vitro Evaluation of Fungicides and Bioagents against Alternaria cucumerina (Ellis and Everh.) Elliott causing Alternaria Leaf Spot in Bottle Gourd Aishwarya S. Kammar 1 *, M. P. Basavarajappa 1 , Raghavendra K. Mesta 1 , S. H. Ramangouda 2 and Shashikanth Evoor 3 1 Department of Plant Pathology, 2 Department of Entomology, 3 Department of Vegetable Science, University of Horticultural Sciences, Bagalkot, India *Corresponding author ABSTRACT Introduction Bottle gourd [Lagenaria siceraria (Mol.) Standl.] is one of the important cucurbitaceous vegetable crops, which belongs to the family Cucurbitaceae having the chromosome number 2n=22. In India, it is cultivated in an area of 149 thousand hectare with production of 2458 thousand metric tonnes (Anon, 2017). In Karnataka, it is cultivated in an area of 0.65 thousand hectare with production of 8.36 thousand metric tonnes (Anon, 2017). Bottle gourd is affected by a number of diseases viz., powdery mildew (Erysiphae cichoracearum), anthracnose (Colletotrichum lagenarium), Alternaria leaf spot (Alternaria cucumerina); CMV etc (Zitter et al., 1998 and Saha, 2002) produced symptoms like small circular spots, on the leaves, that rapidly increased in number and coalescing of spots, lead to blightened appearance. Since the disease is prevalent in Karnataka and causes huge yield loss, there exists a need to find out the fungicidal molecules, which can be effective in managing the disease. Few of the biocontrol agents are also potentially capable of suppressing the pathogen International Journal of Current Microbiology and Applied Sciences ISSN: 2319-7706 Volume 8 Number 12 (2019) Journal homepage: http://www.ijcmas.com A total of fifteen fungicides and four bioagents were tested for their efficacy under in vitro conditions against Alternaria cucumerina. Among fungicides tested, propiconazole gave maximum inhibition (100.00 %) of radial mycelial growth followed by hexaconazole, captan+ hexaconozole and tebuconozole + trifloxystrobin by recording mean per cent inhibition of 98.74, 95.42 and 94.78 per cent respectively. Keywords Alternaria cucumerina, in vitro Accepted: 20 November 2019 Available Online: 10 December 2019 Article Info