~ 666 ~ International Journal of Chemical Studies 2021; 9(2): 666-670 P-ISSN: 2349–8528 E-ISSN: 2321–4902 www.chemijournal.com IJCS 2021; 9(2): 666-670 © 2021 IJCS Received: 02-01-2021 Accepted: 07-02-2021 Anuj Bansal Department of Plant Pathology, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh, India SK Biswas Department of Plant Pathology, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh, India Deepak Baboo Department of Plant Pathology, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh, India Vikram Singh Department of Plant Pathology, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh, India Corresponding Author: Anuj Bansal Department of Plant Pathology, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur, Uttar Pradesh, India Efficacy of different Trichoderma spp. and Fungicides against late blight of potato caused by Phytophthora infestans (Mont.) de-Bary Anuj Bansal, SK Biswas, Deepak Baboo and Vikram Singh DOI: https://doi.org/10.22271/chemi.2021.v9.i2j.11891 Abstract The potato (Solanum tuberosum) is one of the most important vegetable crops in the world, belonging to the family solanaceae and is an important starchy food crop in both sub-tropical and temperate regions. Potato plants are subjected to attack by numerous diseases wherever the crop is grown. Among them, late blight of potato caused by Phytophthora infestans (Mont.) de-Bary is of major cause of concern in potato production at present. An experiment was conducted in the Department of Plant Pathology, College of Agriculture, C S A U A & T, Kanpur. During Rabi season 2016-17 to control. The antifungal activity of different fungicides was evaluated in-vitro through Food poison technique. The experimental finding showed that radial growth of mycelium of Phytophthora infestans was inhibited by fungicides over control. At 100 ppm, the minimum radial growth of mycelium was found in Equation Pro treatment as 5.3, 8.2, 11.4, 14.2, 16.2, 18.4 and 22.6 mm over control against 12.3, 19.1, 26.1, 35.9, 42.5, 51.4 and 64.8 mm at 1, 2, 3, 4, 5, 6 and 7 days after inoculation respectively. Similarly, 500 and 1000 ppm the minimum radial growth of mycelium was found in Equation Pro treatment. Efficacy of bio-control agents on the radial growth of Phytophthora infestans was evaluated using Dual Culture Methods. Among the different concentrations 1000 ppm was found most effective than 100 and 500 ppm. Among the different bio-agents, T. harzianum able to reduced maximum radial mycelial growth of fungus showing 4.6, 8.8, 10.1, 13.2, 15.6, 19.3 and 23.5 mm against 12.3, 19.1, 26.1, 35.9, 42.5, 51.4 and 64.8 mm at 1, 2, 3, 4, 5, 6 and 7 days after inoculation, respectively. Keywords: Trichoderma spp, fungicides, potato, Phytophthora infestans and growth of mycelium Introduction Potato (Solanum tuberosum L.) belongs to the family Solanaceae, considered as "King of vegetables". It is an important tuberous crop cultivated for vegetable, food and several other processed products. It can be grown in wider range of altitude, latitude and climatic conditions. The English word "Potato" comes from Spanish word "patata" (the name used in Spain). Food and Agriculture Organization of UN has declared potato as 'Food for future'. (Hawkes, 1989) [16] . The origins of the potato can be traced back to South American natives in 5000 B.C. in the highlands of the Peruvian Andes Mountains. Around 1570, the potato reached Europe with the returning Spanish explorers. There are more than 160 wild potato species and most of them contain high levels of alkaloids. The first edible potato is considered to have been cultivated 4000 years ago in Peru (Hijmans and Spooner, 2001) [17] . Potato represents valuable sources of nutrient in a balance diet. The average nutritional value of 200g potato is about Calories: 200, Protein: 4.6g, Carbohydrate: 51g, Fat: 0.2g, Cholesterol free and good source of dietary fiber with 4-8g, Niacin: 16mg, Vitamin B6: 7mg, Vitamin C: 26mg Iron: 2.75mg, Magnesium: 55mg, Thiamine: 22mg and Pantothenic acid: 1.12 (USDA 2014) [32] . Now a days potato is also gained a considerable importance as an export crop to European markets and other parts of the world which is considered an important source for national income. (El-Sirafy et al., 2008; El-Mougy, 2009) [9, 8] . India also exports potato to Nepal (32.1%), Sri Lanka (30.4%), Russia (18.6%), Malaysia (5.8%), Mauritius (4.9%) and many other countries of the world. It is the world's fourth important food crop after wheat, rice and maize because of its higher yield potential and high nutritive value. Recently, potato is grown in about 150 countries of the world and the total area under potato production during 2011 was about 19.33 million hectares with a total production of about 19.33 million tons which is