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| I might lean towards stinger + Phytophthora
the stinger damaged the leaves and weakened the plant, and the phytophthora did the knock out blow. It could be two herbicides but I wouldn't rule out two microbial pests. You might want to examine some of the root and root systems. It looks like wet compacted clay soil to me
https://extension.umn.edu/soybean-pest-management/phytophthora-root-... | |
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