Late Season Mites

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From: Curtis Fountain
Sent: Thursday, September 19, 2013 04:28 p.m.
To: Rick Brandenburg
Cc: David Jordan; Curtis Fountain <Curtis_Fountain@ncsu.edu>
Subject: Spider Mites September 19

Rick,

At a Duplin podblasting today, a producer stated he had spider mites. Podblasting results noted some fields within 7 days of optimum maturity, some 10 days from optimum maturity, some 10-14 days from optimum maturity, and some at least 14 days away. At least the later 2 groupings will be podblasted again.

2013 Peanut Information page 95 states for Comite “Do not apply propargite within 14 days of harvest”. For Danitol, it states “Do not apply within 14 days of digging”. 2013 Peanut Information Page 86 states “Bifenthrin, in my opinion, is best suited as a cleanup spray later in the season, when there is less chance of a resurgence of the mites.” The 2013 NC Ag Chemical Manual states for Bifenthrin (Brigade) a “preharvest interval of 14 days”.

Current conditions are very dry. Rainfall may occur this Sunday and Monday.

For spider mites now, what do you suggest (product and approach)? Two sprays 3-5 days apart? One spray at this point? Thanks for your reply.

Curtis

Reply from Dr. Rick Brandenburg

Curtis,

I would NOT spray. Temps are such that mites will not increase much even without rain and the plant isn’t going to recover any following a spray. I do not think the economics can possibly work out on this one. If the grower feels like he must spray ABSOLUTELY DO NOT spray twice, but I would not spray even once.

Rick

On Thu, Sep 19, 2013 at 5:05 p.m., David Jordan <David_Jordan@ncsu.edu> wrote:

I suggest not spraying at this point. I don’t doubt there are some mites but there are some drought affected peanuts that do not have mites. Temperatures are cooling and that will reduce or slow populations. Leaves generally won’t shed from light to moderate mite feeding so pod shed should be minimal. Also expensive. That is just my view. But many people want a sense that they are doing all they can, so if they are within PHI there is no real downside other than expense.

Article first appeared as North Carolina Peanut Note (PNNC-2013-079)

Written By

Rick Brandenburg, N.C. Cooperative ExtensionDr. Rick BrandenburgExtension Specialist (Peanuts & Turf) & Department Extension Leader Call Dr. Rick Email Dr. Rick Entomology & Plant Pathology
NC State Extension, NC State University
Updated on Nov 5, 2014
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