Thanks a lot for the quick reply.
I should have mentioned environment condition also:
At present my roses remains in sun from 11am-4pm and tempretaure is around 39-40 degrees celsius (ya i know temp remain quite high in my area during summer)
My roses are not in pots and I try to water them thrice in a week or when ever the surface of the soil appears to be dry. I also spray water on the leaves as summers are there.
I have applied only a small amount of granular fertilizer recently that contains (humic acid 39%,ascorbic acid 20%, Amino Acids 9%,Thiamine 2%,Alpha-tocopherol 1% ,basicaly a root stimulant)
As I commented earlier that residue or yellow tufts are not on the backside of new leaves so that there is no symtomps of rust. As shown in picture below :
but I observed the backside of old leaves and found some residue please have a look on the pics:
Notice small black holes in tje belo pic of underside leave
the part of upper side of leave looks yellowish where there is these residue (white-pale yellow in color) on the backside of leaves.
About 2-3 months back there were yellow spider mites on my roses. but some how I managed to get rid off them