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United States Department of Agriculture

Agricultural Research Service

Research Project: Molecular Resources for the Improvement of Tropical Ornamental and Fruit Crops

Location: Tropical Plant Genetic Resources and Disease Research

Title: Control of Radopholus similis in anthurium with spinosad, spirotetramat, and thiophanate-methyl

Authors
item Stephens, J.Y. -
item Myers, Roxana
item Lichty, Joanne -
item Sewake, Kelvin -
item Sipes, Brent -

Submitted to: American Phytopathological Society Annual Meeting
Publication Type: Abstract Only
Publication Acceptance Date: May 5, 2014
Publication Date: N/A

Technical Abstract: Radopholus similis is an endoparasitic migratory nematode that causes anthurium decline. Our objective was to evaluate the efficacy of spinosad, spirotetramat, and thiophanate-methyl for the control of R. similis in anthurium. Plants were weighed, transplanted into 15-cm-d clay pots filled with cinders and inoculated with 3000 R. similis. Six months later, treatments of 4.8 mg spinosad, 4.8 mg spirotetramat, 0.01 g thiophanate-methyl, or nothing were applied to the leaves in 50 ml water. Two months later, leaf number and leaf area of the youngest mature leaf were recorded. The average number of leaves on uninoculated plants treated with spinosad, spirotetramat, thiophanate-methyl, or water was 9, 10, 9, and 10, respectively. The average number of leaves on inoculated plants treated with spinosad, spirotetramat, thiophanate-metyl, or water was 11, 9, 11, and 9, respectively. The average leaf area for uninoculated plants treated with spinosad, spirotetramat, thiophanate-methyl, or water was 90.6, 101.2, 96.9, and 77.5 cm^2, respectively, On inoculated plants treated with spinosad, spirotetramat, thiophanate-methyl, or water leaf area was 91.7, 84.5, 76.2, and 92.5 cm^2, respectively. Anthurium treated with spinosad, thiophanate-methyl, spirotetramat, or water increased weight 17, 16, 17, and 14 fold whereas those inoculated with nematodes increased 16, 14, 14, and 15 fold, respectively. Spinosad controls anthurium decline and maybe a treatment option for growers.

Last Modified: 12/19/2014
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