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Control of Peanut Leaf Rust Alone or in Combination with Cercospora Leaf Spot. A. L. Harrison, Plant Pathologist, Texas A&M University Plant Disease Research Station, Yoakum 77995; Phytopathology 63:668-673. Accepted for publication 7 December 1972. DOI: 10.1094/Phyto-63-668.

Two types of experiments demonstrated that peanut rust caused by Puccinia arachidis can be a potentially serious foliage disease of peanuts in the near absence of the Cercospora leaf spot diseases caused by Cercospora personata or C. arachidicola. Losses from peanut leaf rust were reduced by weekly applications of Bravo 75WP, Bravo 6F (chlorothalonil), Dithane M45 (coordination product of zinc ion and Maneb 80% WP), and Fungi Sperse Magi-Cal® (30.5% sulfur, 5.7% zinc, 23% organic calcium compound) to plants treated with Benlate (benomyl) to control the Cercospora leaf spots. These same fungicides and in addition Manzate 200 (coordination product of zinc ion and Maneb 80% WP) and combinations of Benlate + Manzate 200, Benlate + Manzate 200 + Oil (Humble Orchex Oil N795), Dithane M45 + Du-Ter (triphenyltin hydroxide), and Benlate M (commercial mix of Benlate and Manzate 200) also reduced losses on plants affected with both leaf rust and the Cercospora leaf spots. Benlate alone controlled the two Cercospora pathogens but did not control Puccinia arachidis.

Additional keywords: epiphytotic.