Over the past 5 years we have talked a lot about combinations of insecticide seed treatments and the benefits of combining different seed treatments for control of grape colaspis and rice water weevil. We have been comparing combinations of a neonicotinoid seed treatment (CruiserMaxx or NipsIt Inside) with a diamide seed treatment (Dermacor X-100 or Fortenza) for multiple years now.
In our studies when we compare the neonicotinoid seed treatments CruiserMaxx Rice and NipsIt Inside we have observed very little difference in efficacy between the two products. In other words, they both perform equally well. Particularly on grape colaspis.
They also provide control of rice water weevil, but neither provide as great of control as Dermacor or Fortenza. In contrast, Dermacor does not provide adequate control of grape colaspis.
Another thing to remember is that CruiserMaxx Rice and NipsIt Inside protect rice for about 28-35 days. Dermacor on the other hand, provides protection 60-70 days after planting or more, with similar results observed for Fortenza.
With combinations of one of the neonics and one of the diamide seed treatments we consistently see an increase in control of rice water weevil and as a result we see better yields compared to a neonic alone (Table 1). We have seen some increased control when combining CruiserMaxx and NipsIt, but it is less consistent than combinations including a diamide seed treatment.
The question we have been asked a lot recently is: Do I need this combination on every acre? The short answer is no, but its dependent on multiple factors. Planting date and soil texture are the two biggest factors is making this decision.
For rice planted in April, that is more likely to sit in the ground longer and take longer to get to flood, the addition of one of the diamide seed treatments will help tremendously with rice water weevil control. In this planting window there is a much higher likelihood of the neonic seed treatments running out of gas before the flood is applied, which will lead to a reduced control for rice water weevil.
AgFax Weed Solutions
For rice planted in May, a neonic seed treatment will typically suffice. At this point rice is usually coming out of the ground quickly and we can manage to get to flood within the 28-35 day window that the neonics last.
Soil texture is another major factor to consider when making seed treatment choices. Soil texture will dictate whether or not grape colaspis will be a concern. Grape colaspis do not occur in heavy clay soil, which is typical rice ground in large portions of Northeast and Southeast Arkansas.
In these areas a diamide seed treatment for April plantings, or neonic seed treatment for May plantings should suffice. Grape colaspis is very likely to be found in our finer, loamier soils throughout the Grand Prairie and White River regions, so regardless of planting date we have to have one of the neonic seed treatments on our seed to protect it.
The bottom line is we need seed treatments in rice to stay profitable, and while it may cost more money (Table 2), combinations of insecticide seed treatments will pay for themselves in early planted rice. We can still see benefits in later planted rice from the combinations, but in most cases they are not needed.
Commodity prices are not great right now, so we need to be mindful of how we spend our money and be sure to put these combinations of insecticide seed treatments where they belong.