The group I included about 11 isolates with circular colony and smooth margin, which were AcPb, AcNd, AcHl, AcBd, AcJl, AcYt, AcDl, AcBl, AcAm, AcNb and AcJg.
However, it was excellent (++++) in about eight isolates viz., AcNd, AcHl, AcAb, AcYt, AcWs, AcAn, AcBl and AcJg; good (+++) in seven isolates viz, AcPb, AcOs, AcBd, AcJl, AcAk, AcLt and AcNs and fair (++) in five isolates viz., AcSt, AcDl, AcAm, AcNb and AcSl.
However, maximum mycelial width was recorded in AcLt (6.46 [micro]m) isolate, followed by the isolates viz., AcAk (6.30 [micro]m), AcBd (6.10 [micro]m), AcSt (5.89 [micro]m), AcAb (5.70 [micro]m) and AcYt (5.40 [micro]m).
Among these isolates, maximum average conidial size was recorded in the isolate AcAm (35.37 X 9.94 [micro]m), followed by the isolates viz., AcJl (32.27 X 12.76 [micro]m), AcYt (30.00 X 12.27 [micro]m) and AcNd (29.38 X 11.24 [micro]m).
Of the test isolates, AcBl recorded maximum horizontal (4-12) and vertical (1-3) septations, followed by the isolate viz., AcWs and AcLt (each H:4-8 and V:0-2), AcAk (H:3-8 and V:0-1), AcJl (H:3-5 and V:0-1), AcJg (H:2-6 and V:0-2), AcAn and AcNs (each H: 2-5 and V:1-2) and AcYt (H:2-4 and V: 0-1).
Accordingly, in group A the isolates (04) included were AcHl, AcAn, AcBl and AcJg; in group B the isolates (12) included were AcPb, AcNd, AcSt, AcOs, AcAb, AcWs, AcAk, AcLt, AcBd, AcJl, AcYt and AcSl and in group C the isolates (04) included were viz., AcAm, AcNb, AcDl and AcNs.
In group C of less virulent isolates, the leaf spot frequency was ranged from 5.00 (AcDl) to 13.33 (AcAb) per plant; however, it was significantly maximum with the isolate AcLt (12.50), followed by AcAk (11.00), AcOs (10.67), AcSt (10.50), AcBd (9.67) and AcYt (9.00).
In group B of medium sized leaf spots, maximum sized spots were induced with the isolate AcAb (11.90 [mm.sup.2]), followed by the isolates AcLt (11.10 [mm.sup.2]), AcAk (10.43 [mm.sup.2]), AcOs (9.52 [mm.sup.2]), AcSt (9.07 [mm.sup.2]), AcBd (8.64 [mm.sup.2]), AcYt (7.79 [mm.sup.2]) and AcJl (7.16 [mm.sup.2]).