Control of Phoma exigua var. linicola on flax by seed and foliar spray treatments with fungicides.
Seed and foliar spray treatments with fungicides were evaluated in the field in 1990 and 1991 for chemical control of P. exigua var. linicola. The results showed that seed treatments (difenoconazole, prochloraz, flusilazol plus tridemorph) did not reduce the incidence of foot rot of flax when an aerial infection occurred at an early stage of plant development. Under these circumstances, seed treatments must be supplemented with spray treatments. In both years, 1 foliar spray treatment with prochloraz decreased the percentage of disease. In 1991, difenoconazole and flusilazol plus tridemorph, were tested and proved more effective than prochloraz. The efficiency of these fungicides was greatest when applied soon after inoculation, rather than closer to harvest.