Now that it is getting close to that time a year again, I thought it may be appropriate to remind everyone to remember to not forget about soybean cyst nematode sampling. We have been pretty good in the past to address SCN and we got a good indication of how widespread they are and how heavy the infestations are in some fields. Since then, we have been (and probably OK in doing so) more lax on sampling for SCN. After a few years of management tactics, variety selection and rotations, I think it is time to focus on them again. Remember, up to 30% yield reduction can be realized before any visible SCN symptoms are seen in the field.
This discussion cannot be fruitful unless you do something about them once infested in your fields. The best thing for SCN is rotation. Unfortunately, a two year bean rotation is not enough to fully manage SCN, so unless you are going to be planting corn on corn or an alfalfa stand, you need to rely on your soybeans to help in keeping SCN in check.
As of now you have only two options for genetic SCN control; soybeans which have the PI88788 resistance and the soybeans with the Peking resistance. Unfortunately the vast majority (perhaps 97% or so) of the SCN resistant soybeans on the market have the PI 88788 resistance in them and this means of resistance is rapidly losing viability. There are not many, but some Peking soybeans are available and should be incorporated into your SCN control strategies. Do not, however, over use any of these methods. We’ve seen what happened to RR and CRW when used unimpeded.
Plan your varieties carefully. A non SCN bean can still be your best choice. A good non SCN bean in the right field will often out do a SCN bean with the wrong genetics. You should be using all three beans. Rotate the PI88788 genetics with the Peking genetics but not every other year as you will still be only applying the one form of resistance to the field on a C-S rotation. Purposely include non SCN beans as this is the only way to keep the genetic resistance that you have working. Even though the Peking resistance has shown to be many times more effective at controlling SCN than the PI88788, it has been proven beyond doubt that exclusive use of the Peking resistance will cause it to fail within just a few seasons.
This discussion cannot be fruitful unless you do something about them once infested in your fields. The best thing for SCN is rotation. Unfortunately, a two year bean rotation is not enough to fully manage SCN, so unless you are going to be planting corn on corn or an alfalfa stand, you need to rely on your soybeans to help in keeping SCN in check.
As of now you have only two options for genetic SCN control; soybeans which have the PI88788 resistance and the soybeans with the Peking resistance. Unfortunately the vast majority (perhaps 97% or so) of the SCN resistant soybeans on the market have the PI 88788 resistance in them and this means of resistance is rapidly losing viability. There are not many, but some Peking soybeans are available and should be incorporated into your SCN control strategies. Do not, however, over use any of these methods. We’ve seen what happened to RR and CRW when used unimpeded.
Plan your varieties carefully. A non SCN bean can still be your best choice. A good non SCN bean in the right field will often out do a SCN bean with the wrong genetics. You should be using all three beans. Rotate the PI88788 genetics with the Peking genetics but not every other year as you will still be only applying the one form of resistance to the field on a C-S rotation. Purposely include non SCN beans as this is the only way to keep the genetic resistance that you have working. Even though the Peking resistance has shown to be many times more effective at controlling SCN than the PI88788, it has been proven beyond doubt that exclusive use of the Peking resistance will cause it to fail within just a few seasons.
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