Yesterday provided an opportunity to visit some soybean fields and check on growth stages and soybean aphid. The four fields I stopped at were all finished flowering and were in the R6 stage of growth. This is the full seed stage and where on pod on the 4 upper nodes has a seed filling the cavity. Soybean aphid counts were still less than 20 per plant but most all plants had aphids on them. It seems that we are getting to the point that soybean aphid will not be a problem for us in 2009.
Once we get into the R6 stage the plants can tolerate soybean aphid with less effect on yield. The last CORN Newsletter had an article which describe thoughts on higher level thresholds for soybean aphids in bean at these later stages.
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1 comment:
Nice article you got here. It would be great to read more concerning that topic. Thanx for posting this info.
Joan Stepsen
Pharmaceutical tech
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