**6. Host ranges**

Due to the presence of high mutations and variations among the pathogen populations limit the effectiveness of natural resistance in the host plants against the pathogens [71]. Therefore, it is important to access the variability among the pathogen and regarding its host resistance for a successful breeding program. It is also important to replace the low yielding genotypes and disease susceptible varieties with those of high yielding and disease resistance ones.

The forma specialis of lentil has a very limited host range and can induce disease of lentil only under natural conditions. Khare (1980) and Taheri et al. (2010) studied the host range of *Fol* by inoculating it on plants such as cowpea, french bean, bengal gram, lathyrus, mungbean, urdbean, pea, soybean, tomato and eggplant (Solanaceae), melon (Cucurbitaceae) or red gram which results in no infection [53, 72]. Recent host range studies on soybean, chickpea and tomato did not result to infection [73].
