Sumner. D. R. 1987. Efficacy of pencycuron against isolates representing different anastomosis
groups of Rtzizoctonia solarri and Rhizoctonia-like binucleaLe fungi. Plant Disease 7 I : 5 1 5—5 2 8.
Pencycuron was evaluated for efficacy against isolates of Rhizocyonia solani and Rhizocyonia -like
binucleate fungi in soil in the greenhouse at 10.0, 1.0, and 0.1ug/g of soil. Soii was infested
separately with isolates of R. solani (AG-2 type1, AG-2 type 2. and AG-4} and isolates of
Rhizoctonia-Iike binucleate fungi (CAG-2, CAG-3. CA0-4. and CAG-5) from soil and plants in
Georgia. Of the 14 isolates, only one isolate of R. solani AG-2 type 1 was resistant to pencycuron and caused root and hypocotyl rot in snap bean at all dosages tested. Root and hypocotyl rots of
snap bean caused by isolates of R. solani AG-2 type 2. AG4 a second Jsolate of AG-2 type l. and
isolates of CAG-5 were controlled by pencycuron at 10.0 and 1.0 ug/g of soil. Colony-forming
units of only one isolate each of AG-2 type1. CAG-4, and CAG-5 were detected in soil 3 wk after
treatment at10 ug/g.
groups of Rtzizoctonia solarri and Rhizoctonia-like binucleaLe fungi. Plant Disease 7 I : 5 1 5—5 2 8.
Pencycuron was evaluated for efficacy against isolates of Rhizocyonia solani and Rhizocyonia -like
binucleate fungi in soil in the greenhouse at 10.0, 1.0, and 0.1ug/g of soil. Soii was infested
separately with isolates of R. solani (AG-2 type1, AG-2 type 2. and AG-4} and isolates of
Rhizoctonia-Iike binucleate fungi (CAG-2, CAG-3. CA0-4. and CAG-5) from soil and plants in
Georgia. Of the 14 isolates, only one isolate of R. solani AG-2 type 1 was resistant to pencycuron and caused root and hypocotyl rot in snap bean at all dosages tested. Root and hypocotyl rots of
snap bean caused by isolates of R. solani AG-2 type 2. AG4 a second Jsolate of AG-2 type l. and
isolates of CAG-5 were controlled by pencycuron at 10.0 and 1.0 ug/g of soil. Colony-forming
units of only one isolate each of AG-2 type1. CAG-4, and CAG-5 were detected in soil 3 wk after
treatment at10 ug/g.
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