A number of growers have begun planting peanuts. Clemson’s interim peanut specialist, Jay Chapin, has put together some info based on some some questions he’s received recently.
A FEW PLANTING TIME PEANUT QUESTIONS
Our standard is still 6 seed/ row ft, but we can fudge it a little either way for certain situations. For the large seeded virginia types we sometimes drop to a minimum of 5/ft to keep cost a little more reasonable, but I probably wouldn’t do that with early planting in colder soils. On twin row runners we bump it up to 3.5 + 3.5 (7/ft) to take advantage of the extra spacing. There is no justification for going over 6/ft on singles or 7/ft on twins except poor seed quality. Seed quality this year should be excellent.
FloRunner 107 Instead of Florida 07?
Several growers have called about FloRunner 107. Apparently they intended to plant some Florida 07, but there is a shortage of Florida 07 seed at some buying points and FloRunner 107, can be substituted for the Florida 07. Both are high-oleic.
At Blackville, FloRunner 107 has a maturity between Ga 09B (about 135-138 days) and Florida 07 (about 160 days). Maturity of FloRunner 107 is around 145 days – closer to that of Ga 06G.
Florida 07 is late enough that we can plant it before virginia types and still harvest it last. I don’t think I’d do that with FloRunnner 107 for fear that it might mature at the same time as a Bailey.
FloRunner 107 produces about 3% higher grade (TSMK) than Florida 07, which translates to about $30/ac higher value on 2-ton peanuts. Grade is close to that of Ga 09B and Ga 06G.
In 10 yield tests across Ga, Fl, and AL over three years, Florida 07 averaged 5600 lbs. compared to FloRunner 107 at 5574 lbs. At Blackville over three years, FloRunner 107 averaged 116 lbs higher than Florida 07, which may reflect some early digging bias against the later maturing Florida 07. Any way you slice it, FloRunner 107 has been pretty yield competitive.
Disease-wise, FloRunner 107 should be equivalent to Florida 07 on virus, but not quite as good on leaf spot or white mold according to Dr. Barry Tillman (Univ. of Florida Peanut Breeder). With the disease programs we recommend it S. C. we can protect it from both diseases. Consider Convoy, Provost, or Fontelis at 60 and 75 DAP in higher risk white mold fields.
FloRunner 107 has a smaller pod and seed size than Florida 07, Ga 09B, or Ga 06G, which is generally an advantage. We don’t have experience with peg strength at harvest, but chances are it holds on better than Ga 09B and probably not as well as Florida 07.
Bottom line, we don’t have as much on-farm experience with FloRunner 107 in S.C. as we would like, but I think it will perform well.
What About This Quick-Sol That’s Advertised in all the Magazines?
I’m not aware of any replicated tests indicating a yield effect from this product and we are not recommending using it. We are working with the Quick-Sol representatives to measure any response in a replicated, statistically analyzed test at Blackville this year.
Admire Pro vs. Thimet?
We spent a lot of time on this question at our grower meetings this year. Imidacloprid (Admire Pro, and several generics) has been around a long time. It does a good job of preventing thrips stunting, at least equal to Thimet, maybe a little better. Neither is perfect under heavy pressure and drought stress, and can require foliar Orthene follow-up at paraquat time or sooner.
The reason imidacloprid was not used on peanuts for many years was because it consistently caused an increase in tomato spotted wilt virus despite killing thrips. One explanation is that with imidacloprid, the thrips move around more and transmit virus before they die, but it’s probably more complicated. There is good research from the Univ. of Florida to show that Thimet does more than kill thrips; it also increases the peanut plant’s resistance to virus.
The reason imidacloprid is back in the peanut market is that we now have varieties with better resistance. Using imidacloprid instead of Thimet is still going to increase virus, but is it enough to matter on more resistant varieties? Last year for example when Thimet and Admire Pro were compared on six of our standard varieties, all six had more virus with Admire Pro, but virus levels were relatively light and we didn’t see a yield effect. But in another thrips test where we used an older more susceptible variety (Champs), we had some significant yield reduction with imidacloprid. We saw the same thing on NC V-11 in the past.
Bailey seems to hold up well enough on virus using imidacloprid here and in Dr. Jordan’s tests in N. C.; and research at Tifton has indicated that our current runners don’t have a yield drop off with imidacloprid. We have a lot of thrips / virus tests planned this year to get more yield comparisons on runner varieties, particularly early-planted with more virus pressure.
Convenience and more consistent calibration are huge advantages with imidacloprid, but particularly for early planting and more virus risk, the more conservative choice is Thimet until we get more yield results in high risk situations.
Admire Pro is safe to mix with inoculants, but as with any inoculant additive, probably the less time it sits together in the tank the better if you are inoculating land for the first time.