Double digit scale, based on percent blighted area on the flag leaf and one leaf just below given by Kumar et al.,(1998)

1- First and second value, represents percent blighted area on the flag leaf and leave just below. 2-

2- Values 1,2,3,4,5,6,7,8,and 9, respectively correspond to 10,20,30,40,50,60,70,80 &90 percent blighted area.

Therefore, we will have Immune (I) with (00 -01), Resistant (R) with (12 -24), Moderately Resistant (MR) (34 -46), Moderately susceptible (MS)( 56 -68), Susceptible (S) (78 -89) and Highly susceptible (HS)(99)

Thank you sir Yahya Shakhatreh, information provided by you is really helpful for me.