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Effect of Foliar Insecticide Applied at R3 and R5 Growth Stages on Soybean Yield in Ohio

Zelaya Mejia, William David
http://rave.ohiolink.edu/etdc/view?acc_num=osu1712840828908797

Abstract Details

2024, Master of Science, Ohio State University, Horticulture and Crop Science.
Farmers often choose to combine a foliar fungicide with a low-cost insecticide to reduce application costs, sometimes without assessing the level of insect pressure in the field. Therefore, research to evaluate if these applications of foliar insecticides have yield benefits for farmers is necessary. The objectives of this research were to evaluate the impact of foliar insecticide on soybean yield, pod and seed damage, and insect defoliation and population. The research was conducted in 2022 and 2023 at six on-farm locations in Ohio. At each location, the experimental design was a randomized complete block with four replications of each treatment. The treatments involved a non-treated control and two insecticide application timings at R3 growth stage (beginning pod), and R5 growth stage (beginning seed). The insecticide applied was Fastac®, which contains alpha-cypermethrin as its active ingredient. The insecticide was applied at the label rate of 3.8 fl oz acre-1. Insect defoliation and insect population measurements were collected the day of application and two weeks after application. At the R8 soybean growth stage (full maturity), plants were collected and evaluated for insect pod and seed damage. Our results showed that insecticide application did not result in a significant change in soybean yield due to low insect pressure at the time of insecticide application. No significant differences were found on pod damage, seed damage, and seed weight. These findings suggest that there is no reason to use foliar insecticide treatments when insect pest are not at the economic threshold in Ohio. When insecticide is not needed, decision-makers should consider the negatives effects that it can cause. Insecticide can negatively affect beneficial non-target insects like pollinators and natural predators. Prior to insecticide application, it is essential to conduct field scouting and base application decisions on integrated pest management strategies, considering threshold levels of insect populations and defoliation.
Laura Lindsey (Advisor)
Kelley Tilmon (Committee Member)
Osler Ortez (Committee Member)
55 p.
Agriculture; Agronomy; Entomology
Soybean, Insecticide, Insects

Recommended Citations

Citations

  • Zelaya Mejia, W. D. (2024). Effect of Foliar Insecticide Applied at R3 and R5 Growth Stages on Soybean Yield in Ohio [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1712840828908797

    APA Style (7th edition)

  • Zelaya Mejia, William. Effect of Foliar Insecticide Applied at R3 and R5 Growth Stages on Soybean Yield in Ohio. 2024. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1712840828908797.

    MLA Style (8th edition)

  • Zelaya Mejia, William. "Effect of Foliar Insecticide Applied at R3 and R5 Growth Stages on Soybean Yield in Ohio." Master's thesis, Ohio State University, 2024. http://rave.ohiolink.edu/etdc/view?acc_num=osu1712840828908797

    Chicago Manual of Style (17th edition)

osu1712840828908797
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This open access ETD is published by The Ohio State University and OhioLINK.