Agronomic and efficacy evaluations of oxathiapiprolin as a soybean seed treatment

Abstract

Phytophthora root and stem rot is a devastating disease of soybean [Glycine max (L.) [Merr.] that occurs annually in North America. Plant death and severe yield loss can This article is protected by copyright. All rights reserved. transpire when conditions are favorable for pathogen development. The first objective was to determine the efficacy of oxathiapiprolin as a soybean seed treatment using laboratory inoculum layer assays with different races of Phytophthora sojae. The second objective was to evaluate oxathiapiprolin seed treatments in wide area agronomic field testing using unmanned aerial vehicle (UAV) image-to-data analysis to quantify emergence, vigor, and greenness traits. The final objective was to examine the yield potential of seed treatments with oxathiapiprolin. Using inoculum layer efficacy testing in a growth chamber with P. sojae races 4, 7, or 31, seed treated with oxathiapiprolin had significantly higher visual root growth scores compared to non-treated seed. Across 115 field locations from 2018-2020, UAV remote sensing image analysis at the V2 growth stage indicated oxathiapiprolin in combination with other fungicides had significantly better emergence, more vigor, and more intense greenness compared to non-treated controls. Entries treated with oxathiapiprolin in combination with other fungicides had an average +161 kg/ha yield difference compared to non-treated entries from 2018 to 2020. Oxathiapiprolin as a seed treatment is an effective management tool for soybean producers, providing efficacy against P. sojae, and improving emergence, vigor, greenness, and final yield.

Use of oxathiapiprolin for controlling soybean root rot caused by Phytophthora sojae: efficacy and mechanism of action

“…In the present study, oxathiapiprolin application controlled PRR resulting in significantly greater soybean yield in experiments conducted over a period of 2 years. These results are consistent with those of previous studies reporting efficacy of oxathiapiprolin for controlling soybean root rot 30,38 . Specifically, both seed treatment (0.12–0.18 g a.i.…”

“…These results are consistent with those of previous studies reporting efficacy of oxathiapiprolin for controlling soybean root rot. 30,38 Specifically, both seed treatment (0.12-0.18 g a.i. kg −1 seed) and leaf spray (30-40 g ha −1 ) significantly reduced PRR in repeated field experiments.…”

“…Oxathiapiprolin treatments were applied to soybean seeds as described previously. 30 The seeds were sown in 30 m 2 plots (1.2 m × 25.0 m), in two rows separated by 25 cm at a seeding rate of approximately 42 seeds m −2 . A randomized complete block design with five replicates was used.…”

Activity and Point Mutation G699V in PcoORP1 Confer Resistance to Oxathiapiprolin inPhytophthora colocasiaeField Isolates

“…Oxathiapiprolin is a novel OSBPIs fungicide that exhibits excellent activity against many oomycete pathogens, including Phytophthora spp, Pythium spp., Plasmopara viticola , and Pseudoperonospora cubensis . ,, In this study, the baseline sensitivity of P. colocasiae to oxathiapiprolin was determined by analyzing EC 50 values of 97 isolates from China collected between 2011 and 2016. Given that oxathiapiprolin had never been used in China before 2016, the EC 50 values obtained provide an accurate measure of the baseline sensitivity of P. colocasiae to oxathiapiprolin.…”

“…Oxathiapiprolin is a new class of fungicide developed by Dupont Crop Protection and commercialized by Corteva Agriscience. − Oxathiapiprolin exhibits extremely high activity against plant oomycete pathogens, − and it has been introduced into China for the control of P. infestans , P. capsici , and Plasmopara viticola since 2016. However, there are no data about the baseline sensitivity, and the activity of oxathiapiprolin against P. colocasiae .…”