“…Among the biotic constraints, alternaria leaf blight, anthracnose, dry root rot, bacterial leaf blight, YVMV (Moshe et al, 1991;Gillaspie et al, 1998) are important in respect of yield reduction factors. Bacterial blight (Kaur et al, 2006, Jain andAgrawal, 2011), Alternaria leaf spot and Powdery mildew are the important diseases that threaten guar production areas were it is grown (Shivanna and Shetty, 1988a,b;Undersander et al, 1991;Mathur and Sinha, 1993;Lodha et al, 2002;Deore et al, 2004;Jaiman and Jain, 2004;Saharan and Saharan, 2004;Jatav and Mathur, 2005;Singh et al, 2005;Wijesekara et al, 2005;Mohamed et al, 2006;Purkayastha et al, 2006 andAwurum andUwajimgba, 2013). Tolerant varieties with developed inbuilt resistance are the best alternative against these disease to prevent the crop from heavy economical yield losses.…”