Summary
Studies conducted since 1961 revealed that three applications of the asymmetrically-substituted triazine-phosphate, azinphosmethyl (Guthion®), applied prior to bloom to red-skinned potatoes stimulated them to an average yield increase of 15% above that normally attributable to economic control of the potato-insect complex. A similar response also was recorded in studies with the variety, Norgold Russet. Yield increase averaged 17% following two applications; an apparent phytotoxic response was obtaintd when three applications prior to bloom were made, as yield increases only averaged 4%.
Studies with methyl-ethyl Guthion and other insecticides with triazine, pthalimide, or nitrogen substituents failed to induce a response similar to that obtained with Guthion.
No apparent effects on certain physiological processes in the potato were noted. An indication that the long photoperiod experienced in the pre-bloom months of June and July may catalyze this phenomenon is presented. Additional study is needed to elucidate the mechanisms of action involved.
Resumen
Estudios conducidos desde 1961 han revelado que tres aplicaciones del asimetricamente-sustituído triazine-phosphate, azinphosmethyl (Guthion®), suministradas antes de la floraciún de las papas de piel roja, han estimulado una producción en un promedio de 15% más alta que la que se puede esperar del control económico del complejo papa-insecto. Una reacción similar se registró también en estudios con la variedad Norgold Russet. Un incremento de 17%, en promedio, se obtuvo después de dos aplicaciones; después de tres aplicaciones antes de la floración, se obtuvo aparentemente una reacción fitotóxica porque los incrementos de rendimiento fueron solamente 4% en promedio.
Estudios con methyl-ethyl Guthion y otros insecticidas con triazine, pthalimide, o sustituto de nitrógeno no produjeron una reacción similar a la obtenida con Guthion.
No se notaron efectos aparentes sobre ciertos procesos fisiológicos en la papa. Se presenta una indicación que el fotoperiodo largo que ocurre en junio y julio, antes de que florezcan las papas, puede ser la causa de este fenómeno. Estudios adicionales son necesarios para elucidar el mecanismo de este fenómeno.
Similar content being viewed by others
Literature Cited
Hacskaylo, J. and A. L. Scales. 1959. Some effects of Guthion alone and in combination with DDT and of a dieldrin-DDT mixture on growth and fruiting of the cotton plant. J. Econ. Entomol. 52(4): 396–8.
Schulz, J. T. 1961. A physiological response of potato to foliar applications of the insecticide, Guthion. J. Econ. Entomol. 54(5): 839–40.
Schulz, J. T. 1963. Unpublished annual report of the Department of the Department of Entomology, North Dakota State University, 15–29.
U. S. Department of Commerce. 1960–1966. Climatological Data. 69–75: 6–7.
Author information
Authors and Affiliations
Additional information
Published with the approval of the Director of the North Dakota Agricultural Experiment Station as Journal Article No. 151.
Rights and permissions
About this article
Cite this article
Schulz, J.T. Factors influencing the effects of the triazine-phosphate insecticide azinphosmethy (Guthion) on potato. American Potato Journal 45, 279–286 (1968). https://doi.org/10.1007/BF02850283
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF02850283