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Growth of Phymatotrichopsis omnivora in Flutriafol Treated Field Soils

Flutriafol (Topguard) fungicide has shown efficacy for control of cotton root rot, caused by the soil borne fungus Phymatotrichopsis omnivora, in field trials in Arizona, but results have been variable. A laboratory bioassay was developed to determine growth of P. omnivora in soils sampled from experimental field plots treated with flutriafol or untreated. Flutriafol was applied at 32 oz/as a T-band spray over the seed furrow, or as an in-furrow treatment. Fields were pre-irrigated, and seed was planted into moisture. Soils were sampled in the seed line after subsequent irrigations and assayed for growth of P. omnivora. Growth and fungal strand development of P. omnivora was inhibited in all samples from flutriafol treated plots, but was not inhibited in soils from untreated plots. Results indicate that flutriafol moves downward in soil from the application site and is active in the top 8 inches of soil for at least 3 irrigations. It was concluded that variability in disease control is not the result of loss of fungicidal activity in the upper root zone.