Development of suitable integrated approach for management of late blight of potato under climate change

Abstract

Late blight caused by Phytophthora infestans (Mont.) de Bary is the most important newlineand destructive disease of potato causes quotIrish Faminequot in 1845. The management of the newlinedisease is mainly based on cultivation of resistant variety and use of fungicides. However, newlineresistance against pathogen is not a permanent solution and fungicidal is not eco-friendly newlineand economical. Therefore, inquest for IDM modules by using soil application with newlinecompost, tuber treatment with T. harzianum and foliar spray with fungicides were assessed newlineduring the course of present investigation and mechanism of defense response in term of newlinesoluble protein and total phenol were ascertained. newlinePreliminary research on evaluation of fungicides showed that the maximum newlineinhibition per cent of mycelial growth of P. infestans was recorded from Equation Pro at newline1000 ppm (76.08 %). The IDM practices have ability to increase tuber germination and newlinegrowth parameter of potato. The highest total yield as 417.30 and 449.40 gm per plant was newlinealso obtained from T9 (Soil application of FYM + Poultry Manure + Tuber treatment with T. newlineharzianum + three foliar spray with Equation Pro) treated plant, against 218.78 gm and newline211.68 gm in case of control in year 2016-17 and 2017-18 respectively. The minimum newlinedisease severity 1.65%, 5.28%, 9.05%, 14.92% and 1.70%, 5.35%, 9.65%, 15.10% were newlinerecorded in T9 (Soil application of FYM + Poultry Manure + Tuber treatment with T. newlineharzianum + three foliar spray with Equation Pro) against 30.12%, 48.84%, 61.35%, newline82.55% and 30.50%, 49.05%. 62.00%, 82.95% in case control (pathogen inoculation) at 45, newline60, 75 and 90 days after showing during 2016-17 and 2017-18 respectively. The treatment newlinewith IDM approaches prior to challenge inoculation sensitized the plant to produce newlineincreased levels of soluble protein and total phenol content. The maximum increase of newlinesoluble protein as 37.97 and 38.02 mg/gm of fresh leave and total phenol content as 3.42 newlineand 3.40 mg/gm of fresh leave at 8 days of inoculation during 2016-17 and 2017-18 newline newline newline