South Carolina Peanuts: Evaluating Maturity

Here is some maturity info from Clemson Peanut Specialist Jay Chapin.

Maturity evaluation is going to be challenging this year to say the least.  You name it and we have it. We have fields ready to dig next week ahead of average calendar maturity.  We have fields of both runners and virginias with a crop set that will be at least 10 days behind average calendar maturity.

We have stressed fields that currently have zero harvestable yield but just got a rain and are starting over for late Oct. harvest.  And perhaps most difficult, we have fields with a split crop where we’ll have to decide if we need to just take the reduced quality taproot crop we have.

When to stop spraying fungicide?

A fungicide treatment at 105 DAP normally carries even a 145 day runner to maturity if no leaf spot is present 2 weeks after the 105 DAP treatment.

A fungicide rule of thumb:  If it has been 2 weeks since the last spray, and late leaf spot lesions can’t be found in the bottom of the canopy, you are good for a bare minimum of three weeks and more likely a month.  If you are not sure you will get the field dug within 4 weeks, an insurance application can be made on at least some of the acreage at 120 DAP.

Even if you have some late leaf spot present (lesions on < 5% of lower leaflets) you are good for 2 weeks.  But they better be mature in two weeks.

Another Velvetbean Caterpillar Warning


Don’t ignore velvetbean caterpillar on late maturing peanuts below the lakes.  We are seeing a lot of moths laying eggs.   Color can range from light green to dark brown, almost black.  The dark ones almost always get misidentified as armyworm.  These are not tough to kill.  Pyrethroids still get them, but they can strip a field (especially late beans) in a hurry if ignored.

Moths are easy to recognize – they have a single line going from one tip to the other.

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