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| I spray as soon as possible since it is mainly noticed on edge of field when damage has been done. Spidermites damage is a huge yield loss and soybeans never outgrow it even if weather is perfect for the rest of the year. If you see just damage on edge, going around the edge of field with sprayer will kill most of them and prevent them from spreading further into the field. If it is going to stay dry then spray the whole field.
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Spidermite threshold ?
