I know I missed a week of updates, but it was not much change in peanut maturity since recently. On Sep 28, however, some fields started looking close to digging. While some fields in theory still need three weeks to mature, others can be dug soon (see picture below showing samples of ‘Sullivan’ peanut planted at about the same time but in different fields with different conditions through the summer).
Maturity of peanut in Isle of Weight County, VA, on Sep 28, 2020. Samples are from different fields planted with Sullivan in mid-May.
Similarly, cultivar ‘Bailey’ showed variable maturities depending on the soil type, growth conditions, and irrigation. But in majority of approximately 35 samples looked at on Sep 28, Bailey seemed ready to dig starting within the first week of October.
With the exception of Bailey, peanut cultivars currently grown in Virginia have the high oleic oil chemistry. Thus, it is important to realize that cooler temperatures at this time of completing maturity may affect the high oleic oil chemistry. Research showed that temperatures in the range of 85 to 90 F during pod filling to harvest increased the oleic fatty acid content, which makes peanut a high oleic peanut; while lower temperatures promoted the linoleic fatty acid. I hope not, but if research proves right for our late maturing peanut this fall, when temperatures dropped in high 60’s or at the most 70’s for the past 3-4 weeks, this determination should be made as soon as first peanuts are picked and measures taken. This is particularly important for Virginian growers that primarily grow peanut for certified seed production.