Dr. Jarrod Hardke, Dr. Gus Lorenz, & Dr. Nick Bateman
February 13, 2018 No. 2018-02 www.uaex.edu/rice
Combining Insecticide Seed Treatments for Rice
We are getting a lot of calls on “overlaying” another insecticide seed treatment on top of seed already treated with an insecticide seed treatment. Obviously, this comes at an additional cost to the grower and there needs to be research to support that the added cost provides an additional benefit to the grower.
In our studies, when we compare the neonicotinoid seed treatments CruiserMaxx Rice and NipsIt INSIDE to one another, we have observed very little difference in efficacy. In other words, they both perform equally well on their own, particularly on grape colaspis. They provide control for rice water weevil too, but both do not provide control equal to that of Dermacor. However, Dermacor does not provide adequate control of grape colaspis.
Another thing to remember is that CruiserMaxx and NipsIt provide protection of the rice for about 28-35 days. Dermacor, on the other hand, provides protection for 60-70 days after planting or more. Another difference is that CruiserMaxx and NipsIt provide protection against chinch bugs and aphids while Dermacor provides protection against caterpillar pests such as fall armyworm and rice stem borer.
With growers planting earlier, and as a result, growth being slow from cool temperatures, we see the permanent flood going on later, often as many as 30-50 days after planting. By the time rice water weevils hit the field, the residual control of CruiserMaxx and NipsIt is gone and little or no control for rice water weevil is observed, as should be expected.
We have spent the last few years looking at combining insecticide treatments to enhance control of grape colaspis and rice water weevil. In rare cases, we have seen some benefit to putting both CruiserMaxx and NipsIt on the seed to improve control, but the data is extremely limited. In most cases we do not see a benefit to this combination. If you think about it, it just makes sense. Both provide control of the same pests at about the same level and the residual control is essentially the same. The data in Figure 1 shows some of these results and they are inconclusive at this time.
Fig. 1. 2017 Rice Insecticide Seed Treatment Studies from Pine Tree (PTRS) and Stuttgart (RREC).
Adding Dermacor to CruiserMaxx or NipsIt appears to give us early season control of grape colaspis and the longer season control for rice water weevil, particularly when we go to permanent flood at 5 weeks or more after planting. The data is still insufficient to recommend this practice, but this approach looks like it could one day be very promising for growers that have both grape colaspis and rice water weevil. Again, we are working hard to come up with the best solutions that will give the best return on investment for our growers.
The purpose of our studies exploring these combinations of insecticide seed treatments was to obtain excellent control of both grape colaspis and rice water weevil – something that the current products do not achieve when used alone. There is a lot of rice grown in NE Arkansas and SE Arkansas and on clay soils where grape colaspis is not an issue, so the value of this approach of mixing insecticide seed treatments, particularly overlaying neonicotinoids, is probably not going to be beneficial to those growers.
The up-front cost of production in rice is daunting to say the least and we need to choose the inputs that will give a return on investment for our rice growers. Think before you spend an extra $6-12 per acre on a product that may or may not give you a return on investment.
At this time, there is simply not enough research data to support the idea that combining or overlaying insecticide seed treatments is worth the money.
Enterprise Budgets and 2018 Rice Farming for Profit Updated
Updates have been made to correct the Crop Enterprise Budgets for rice, resulting in the need to make changes to overall production costs in the 2018 Rice Farming for Profit Total Net Return table included below. The full file is available here: 2018 Rice Farming for Profit.
As always, it is highly recommended to relate the production costs listed to those on your own farm / fields to more accurately gauge potential economic returns for your operation. Adding any net return back to the production cost for that cultivar will give the total revenue – then you can subtract your production costs to better represent potential net return for your operation.
GMO Rice Seed Testing for 2018
Please follow these links for information from the Arkansas State Plant Board on GMO rice testing for seed from the 2017 harvest for the 2018 planting season. Contact ASPB if you have any questions.
Link: Letter and Testing Labs
Link: Process Summary
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This information will also be posted to the Arkansas Row Crops blog (http://www.arkansas-crops.com/) where additional information from Extension specialists can be found.
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We sincerely appreciate the support for this publication provided by the rice farmers of Arkansas and administered by the Arkansas Rice Research and Promotion Board.
The authors greatly appreciate the feedback and contributions of all growers, county agents, consultants, and rice industry stakeholders.