NemaStrike™ – A New Seed Treatment to Control Nematodes for Corn and Beans


A new seed treatment is being offered on select Renk corn and soybean products. NemaStike™ is a new mode of action nematicide that is applied to the seed surface along with Acceleron seed treatment. It was developed to control the nematodes that affect corn and soybeans. It has low water solubility and low mobility in the soil, so it stays around the seed and roots to provide control of nematodes in the root zone for up to 75 days. While the active ingredient is selective only for nematodes, it provides broad spectrum control of most of the nematodes that affect both corn and beans.

Nematodes are microscopic roundworms that exist in the soil of many fields throughout the Midwest. They may go undetected for years but if they are in your soil piercing and infecting the roots of your plants, they are robbing your plants of yield potential by stealing nutrients and water and opening the doors for secondary issues such as fungi and bacteria to move in. Other stresses such as drought or disease will combine to exaggerate the nematode damage. Nematodes are originally brought into your fields by physical transfer
of the eggs or worms. Once there, they rapidly reproduce with many generations per year and will be evident in colonies throughout your field. They move and proliferate easier and faster in lighter or sandy soils, but are also prevalent in all other soil types.

More than 250 trials have been conducted across the corn belt comparing Nemastrike to a competitive standard that is widely used. Nemastrike showed a 7 bu advantage in corn and a 3 bu advantage in soybeans over that standard. More side by side trials are being run this year and preliminary results are consistent with those in previous years.

Keep in mind that results will vary depending on nematode pressures in your fields.

Contact your Renk Seed district manager to discuss which Renk corn and soybean product is available with this new seed applied technology.

Clariva™ Seed Treatment

This year we conducted side-by-side evaluations of an untreated variety against the same variety treated with Clariva™ to get a feel for its benefits. There have been a lot of new seed treatments out there so we evaluate them to see if they show promise. Sometimes they don’t pan out and we award them the ‘Monkey Dust’ title for products that don’t really do anything. Clariva™ was ­not one of these.

Clariva™ is a biological treatment that infects and kills nematodes. When the nematodes die, they release more spores that will infest other nematodes, in turn killing them. Sounds like a nematode nightmare.

In our testing, Clariva™ provided a positive response. The Clariva™ treated seed outperformed the untreated seed in 19 of 29 plots. This shows that Clariva™ does work. However, the performance gap was quite slim at +0.8 bushels overall.

So what can we take away from this? For Clariva™ to work, we need to have enough nematodes to effect the yield. Many of the plots that the product was planted in are not considered at risk for nematodes. Looking at the map below we can see that in WI, MI, NE and SD response was anemic or mixed. These areas are not known to be high risk for cyst. In the areas of higher risk for cyst such as Southern MN and Northeast IA the response was positive. Again, the response was positive but not by a large margin.

The goal of our testing was to see if Clariva™ was worth adding as a general option for seed treatment. Unfortunately the results are not strong enough for that. Clariva™ is showing a positive response but I would only be looking at it as an option for severely infested fields.