In Vitro Activity of Sodium Tetrathiocarbonate on Sporulation and Growth of SixPhytophthoraSpecies

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Abstract
Sodium tetrathiocarbonate releases carbon disulfide when added to water and applied to soils. In vitro tests were initiated to examine growth and sporulation of Phytophthora parasitica, P. citrophthora, P. capsici, P. cactorum, P. cambivora, and P. drechsleri in the presence of sodium tetrathiocarbonate. The duration of zoospore motility for these species was reduced 94% in an aqueous solution containing 12 .mu.g/ml of this chemical. Production of zoospore cysts was reduced 47,74, and 83% by sodium tetrathiocarbonate of 2.4.12 and 60 .mu.g/ml, respectively. Zoospore cysts formed in the presence of the compound at 2.4 .mu.g/ml were viable, whereas those formed at 12 .mu.g/ml did not germinate. Sporangium production in soil by P. parasitica, P. citrophthora, P. capsici, and P. cactorum was reduced 23, 65, and 98% in the presence of sodium tetrathiocarbonate at 122, 245, and 490 .mu.g/ml, respectively. However, concentrations of sporangia and viable zoospore cysts, thus reducing inoculum production and subsequent new infections by Phytophthora species.