pnut pnut Peanut Science 0095-3679 0095-3679 American Peanut Research and Education Society 10.3146/i0095-3679-13-1-11 Articles Southern Stem Rot Suppression On Peanut With The Insecticide Chlorpyrifos1 A. K. Hagan , J. R. Weeks , and R. B. Reed 2 Plant Pathologist-Nematologist and Pest Management Specialist, Alabama Cooperative Extension Service; Research Associate, Research Data Analysis, Alabama Agricultural Experiment Station, Auburn University, AL 36849

1Journal article no. 13–86991 of the Alabama Agricultural Experiment Station. This study was funded in part by the Alabama Peanut Producers Association.

 1 1986 13 1 36 37 14 6 1986 American Peanut Research and Education Society 1986 American Peanut Research and Education Society Abstract

Chlorpyrifos 15G(2.24 kg a.i./ha), PCNB 10G (11.2 kg a.i./ha), and PCNB 10G + chlorpyrifos 15G(11.2 + 2.24 kg a.i./ha) were compared for the suppression of southern stem rot caused by Sclerotium rolfsii Sacc. on peanut in on-farm trials on nine farms over three years (1982–1984). Chlorpyrifos, PCNB, and PCNB + chlorpyrifos significantly reduced loci counts all three years. PCNB + chlorpyrifos generally gave the best stem rot suppression and yield response, but there was little difference in disease loci counts between chlorpyrifos and PCNB. PCNB significantly increased yield over the control two years while chlorpyrifos increased yield only one year.

 Key Words Arachis hypogea; , groundnut; , white mold; , Lorsban; , Terraclor