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When spores of Glugea fumiferanae were treated with chlorides of alkali metals at pH 10.8 at 28 ± 1 °C, the polar filament was extruded by almost 70% of them within 40 min. The effect of pH varied with the different metals, the effective range being greatest for Cs, and becoming progressively narrower for Rb, K, Na, and Li. Although KCN and NaF are normally metabolic inhibitors, both were effective in stimulating extrusion of polar filaments. Previous treatment of the spores with either AgNO3 or HgCl2 inhibited the stimulatory effect of CsCl, but CuSO4 had no inhibitory effect. Calcium chloride interfered with the stimulatory effect of CsCl, but the effect became less as the concentration of CsCl increased. p-Chloromercuriphenylsulfonate, salyrgan, and physostigmine were all ineffective in inhibiting extrusion of polar filaments.