Impact of soil type and placement of Xyway LFR fungicide on germination and growth of corn seedlings under a controlled setting.

Abstract

Xyway LFR was released for use in corn as an in-furrow fungicide during 2020. Producers have raised concerns of reduced emergence and growth in corn plantings. Here we assessed the impact of Xyway LFR placement in relation to the seed for impacts on seedling emergence and growth in two contrasting soil types (sand vs topsoil) under controlled conditions. Soil was added to containers and five corn seeds were placed in a row in a furrow within each container. Xyway LFR was applied in a band at labelled rates at either 0 (directly on seed) 1.27, cm, 2.54 cm, or 5.08 cm away from the seed. Containers were maintained under a light bank and germination over time, as well as seedling biomass, was assessed. Statistical analysis indicated that plants in topsoil had greater germination rates and dry masses than plants in sand. Total plant dry masses were reduced relative to controls when Xyway LFR was placed 0 cm from the seed. However, when placed 2.54 or 5.08 cm from the seed, this impact was not evident. Potential phytotoxic effects may be mitigated by placing the product in a band at least 2.54 cm from the seed furrow.