Control of Cylindrocladium black rot of peanut with Propulse, a 1:1 mixture of prothioconazole and fluopyram
P. M. PHIPPS (1), D. P. Telenko (1), G. H. Musson (2)
(1) VPI&SU, Suffolk, VA, U.S.A.; (2) Bayer CropScience, Research Triangle Park, NC, U.S.A.
Phytopathology 100:S100

Two field trials were conducted in 2009 to assess control of Cylindrocladium black rot (CBR) of peanut with foliar sprays of Provost 433SC (prothioconazole 0.084 + tebuconazole 0.169 kg a.i./ha or prothioconazole 0.113 + tebuconazole 0.226 kg a.i./ha), and seed-furrow treatments with Proline 480SC (prothioconazole 0.2 kg a.i./ha) or Propulse 400SC (prothioconazole 0.215 + fluopyram 0.215 kg a.i./ha). All plots received three foliar sprays of Provost at the low or high rate and one final spray of chlorothalonil 1.263 kg a.i./ha. Treatments were mixed in water for delivery in 140 liter/ha in foliar sprays and 48 liter/ha in-furrow. The standard for CBR control was metam sodium 32 kg a.i./ha applied under each row 2-wk prior to planting. Plots were four, 10.7-m rows spaced 0.9-m apart and treatments were randomized in four complete blocks. Low and high rates of Provost provided excellent control of foliar diseases but showed no differences in CBR incidence. Proline in-furrow significantly reduced CBR incidence by 43 and 33% while the Vapam standard reduced incidence by 52 and 55% in trial 1 and 2, respectively. Propulse in-furrow reduced CBR incidence by 83 and 57% in both trials. Yields were increased significantly by Propulse and by metam sodium in trial 1. Yields in trial 2 were not different; however, Propulse and metam sodium made the highest yields. Propulse is the first in-furrow fungicide to show promise as a replacement for metam sodium in control of CBR.