Here is another quick update on soybean aphids. So far, I have only found a handful of fields in which it is time to spray. The vast majority of soybeans have very low levels and those levels haven’t been increasing very fast. So far, there is no reason to panic, just keep monitoring them. We have a few weeks left before they are of no concern.
If spraying does happen there are a few thoughts you should take into consideration when deciding which product to use. There are only two chemistries (chlorpyifos – the active ingredient in lorsban and generics, and bifenthrin – the active ingredient in capture and generics) that have any effect on spider mites. This is of concern because there is a confirmed resistance of mites to chlorpyifos and this is probably due to the arbitrary use of low rates with glyphosate ‘just because it is so cheap’. If you decide to use one of these products, use the full rate, when it is needed and switch to another product next year just to mix up the chemistry. I think it may be wise to skip the premix products that have a low rate of two different products simply for this reason. This year I’m going with bifenthrin.
Have you walked any corn? The storm a few days ago made some holes in a few fields – don’t be surprised at harvest.
If spraying does happen there are a few thoughts you should take into consideration when deciding which product to use. There are only two chemistries (chlorpyifos – the active ingredient in lorsban and generics, and bifenthrin – the active ingredient in capture and generics) that have any effect on spider mites. This is of concern because there is a confirmed resistance of mites to chlorpyifos and this is probably due to the arbitrary use of low rates with glyphosate ‘just because it is so cheap’. If you decide to use one of these products, use the full rate, when it is needed and switch to another product next year just to mix up the chemistry. I think it may be wise to skip the premix products that have a low rate of two different products simply for this reason. This year I’m going with bifenthrin.
Have you walked any corn? The storm a few days ago made some holes in a few fields – don’t be surprised at harvest.
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