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Phytotoxicity of fosetyl Al and phosphonic acid to maize during production of vesicular-arbuscular mycorrhizal inoculum

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Seymour, N. P., Thompson, J. P. and Fiske, M. L. (1994) Phytotoxicity of fosetyl Al and phosphonic acid to maize during production of vesicular-arbuscular mycorrhizal inoculum. Plant Disease, 78 (5). pp. 441-446.


Article Link: https://doi.org/10.1094/PD-78-0441

Publisher URL: https://www.apsnet.org/publications/PlantDisease/BackIssues/Documents/1994Articles/PlantDisease78n05_441.PDF


Research into the function of vesicular arbuscular mycorrhizae (VAM) requires production of sufficient quantities of high-quality inoculum. Contamination of one of our Glomus cultures on maize with Pylhhim myrioiylum prompted us to assess the effects of anti-oomycete fungicides on colonization of maize by strains of Glomus mosseae, G. macrocarpum, G. elunicalum, and G. microcarpum. Following mycorrhizal inoculation, partially sterilized soil in pots was treated with fungicides at rates recommended for Pythium control: I) metalaxyl (0.05% Ridomil 250WP, 100 ml per pot as a soil drench, or 2.5 g of Ridomil 50G per 10 L of soil), 2) fosetyl Al (0.1% Aliette 740WP, 200 ml per pot as a soil drench), and 3) phosphonic acid (0.25% Foli-R-Fos 400, 100 ml per pot as a soil drench), all applied before planting the maize. Plants treated with fosetyl Al or phosphonic acid had stunted roots and tops that were rosetted and spindly with white variegated streaking of the leaves, symptomatic of induced zinc deficiency. Percent colonization of the roots was slightly decreased by fosetyl Al and phosphonic acid, but the total length of mycorrhizal root was markedly decreased. Metalaxyl had no phytotoxic effects on maize. Excellent mycorrhizal colonization of the Glomus-inoculated pots was obtained with the metalaxyl treatments, indicating that this fungicide did not adversely affect VAM cultures. Melalaxyl (granular form) is recommended for routine addition to open-pot cultures of VAM fungi on maize.

Item Type:Article
Business groups:Crop and Food Science
Keywords:Zea mays
Subjects:Plant culture > Field crops > Corn. Maize
Plant pests and diseases
Plant pests and diseases > Plant pathology
Live Archive:15 Jul 2021 00:12
Last Modified:03 Sep 2021 16:46

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