FIG 7.

Bacillomycin D effects on F. graminearum PH-1 infection of corn silks, wheat seedlings, and wheat heads. (A) Corn silks were inoculated with a 0.6-cm-diameter plug containing F. graminearum PH-1 mycelia and then were treated with 30 to 90 μg/ml bacillomycin D; 6.67% (vol/vol) methanol served as the control. White arrows show the reddish-brown discoloration in the corn silks. (B) Wheat seedlings were inoculated with conidial suspensions of F. graminearum PH-1 and then were treated with 30 to 90 μg/ml bacillomycin D. A conidial suspension (10⁶ conidia/ml) with 2% (wt/vol) gelatin and 6.67% (vol/vol) methanol served as the control. Black arrows show the black discoloration in the wheat seedlings. (C) Wheat heads were point inoculated with conidial suspensions of F. graminearum PH-1 and then were treated with 90 μg/ml bacillomycin D. A conidial suspension with 6.67% (vol/vol) methanol served as the control.