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Effect of Oil Emulsions on the Uptake of Benomyl and Thiabendazole in Relation to Control of Verticillium Wilt of Cotton. D. C. Erwin, Department of Plant Pathology, University of California, Riverside 92502; R. A. Khan(2), and H. Buchenauer(3). (2)(3)Department of Plant Pathology, University of California, Riverside 92502. Phytopathology 64:485-489. Accepted for publication 22 October 1973. DOI: 10.1094/Phyto-64-485.

Two commercially available paraffinic oils, Orchex N 795 (P795) and Orchex 696 (P696) augmented the uptake and translocation of benomyl and thiabendazole in cotton plants. P795 and P696 oils were more effective than the naphthenic oil, Orchex 792 (N792). The isoparaffinic oil Humble 3408 (IP3408) was ineffective in augmenting the uptake and translocation of benomyl or thiabendazole. P795 or P696 oils at 20% concn were more effective in augmenting translocation of benomyl than at lower concns, but the higher oil concns were phytotoxic. When benomyl was made water-soluble with HCl (pH 1.7 - 2.0), paraffinic oils also augmented its uptake. When 14C-thiabendazole plus P795 oil was applied to lower parts of the stem, a significantly larger quantity of radioactivity was detected in the upper stem and petioles of the cotton plant than when 14C-TBZ was applied in water containing the wetting agent Triton X-100. When cotton plants were inoculated with Verticillium albo-atrum after thiabendazole or benomyl (20 mg/plant) was applied to the stem with the paraffinic oils, disease onset was delayed or prevented. Neither chemical applied in an aqueous suspension delayed or prevented disease.

Additional keywords: methyl 2-benzimidazole carbamate, Gossypium hirsutum.