Size-Frequency Characteristics of Pinus echinata Pollen

OF MILDEW 325 Preliminary tests in aniInals (I) would indicate the nontoxicity of actidione in the concentrations here reportecle The important fact is that actidione, which is an antibiotic substance derived from a fungusn exhibits a growth-inhibiting effect on another plant parasite and in amounts as small as froln I to 5 p.p.m. This suggests the possibility of utiliziIlg antibiotic substances in large-scale industrial and field operations for the control of fungus diseases of plantse