The fungicide propiconazol was tested during 1982 at two locations in Texas to measure its efficacy in controlling Phymatotrichum root rot. The fungicide was tested at Aquilla and Temple. In the Temple test the 2.5% granular formulation was applied to the soil at 1.5 and 0.57 kg. a.i./ha and the emulsifiable concentrate was applied both in-the-furrow and on the foliage at 100 and 1000 g a.i./ha. In the test conducted at Temple a significant reduction in root rot was observed with all treatments as compared to the check plots.

In the test at Aquilla a 2.5% granular formulation was applied at 0.56 kg a.i./ha at the time of planting. An emulsifiable concentrate (0.45 kg/1) was sprayed in the furrow at the time of planting at 0.56, 1.12, and 2.24 kg a.i./ha. Foliar applications were also tested. Rates tested were 0.56, and 1.12 kg a.i./ha. Material was sprayed on one set of plots 66 days, and on a second set at 73 days after planting. The 2.5% granular formulation gave excellent control of the disease with a 55% reduction in the amount of disease. The emulsifiable concentrate sprayed in the furrow at the time of planting at the rates of 1.12 and 2.24 kg a.i./ha gave good control with 19.3 and 23.2% reduction in the amount of disease, respectively.