Dan Anco Clemson Peanut Notes No. 233 2020

— Written By
The week ahead looks to be bringing some warmer temperatures without much rain. This will help wet fields to dry out for digging and picking, and help pods develop needed maturity where still needed. Some of the later planted or longer maturing runners look to still need two to three weeks for optimal maturity. If the weather following this coming week and next stays warm without the nightly lows dipping too far into the low 50s or lower, the crop should continue to develop. I hope the coming weeks are kind and allow this to pass. For context, an average daily temperature of 64F has a degree day accumulation of 8 units, whereas some of the warmer days in September with averages in the low 80s brought three times the heat units (24). Continuing to check pod maturity will help prevent additional surprises. We have seen some move quicker over a week than anticipated, and some fields have shown not much movement after two weeks.
October usually provides workable conditions in the state. We still on average see cooler temperatures in our northern counties, but often… it isn’t until November for nights near freezing. Each year continues to be different, so the average condition only gives us an idea. In the more short term, so far tropical depression 25 looks like it may not be headed our way.
If dug pods have been on the ground and rained on for several days before picking, giving them a good look before combining and potentially adding to the trailer with another load can be a good move. A few of our test plots have mold after being rained on a few times followed by slow drying. In those cases, separate trailers can prevent a load from contaminating another. Overall the crop in the state has had good condition, everything we can do between digging and picking will hopefully retain this.
For diseases, late season development of tomato spotted wilt symptoms appears to be increased this year. Some test plots have about doubled in symptoms compared with a month ago. Late leaf spot continues to develop as well. If a final leaf spot application is still needed, adding chlorothalonil is good for resistance management, helping to prevent insensitive populations from overwintering. This part of the year when we are finishing up the crop is when we see the benefits of having a good management plan with effective fungicides in place during the earlier parts of the growing season.

Dan Anco

Extension Peanut Specialist and Assistant Professor

Department of Plant and Environmental Sciences

Clemson University – Edisto Research and Education Center

64 Research Road

Blackville, SC 29817

630-207-4926 cell

danco@clemson.edu

Clemson Peanut Extension