Several active ingredients of this chemistry have been added to the seed treatments over the past few years. They have a limited spectrum of activity, but for the most part they are contributing to better stands and yield under Ohio’s conditions. Some of the strobilurins have activity towards some but not all of the Pythium spp. This is giving an added benefit to the soils with poor drainage, no-till and where even with the high rate of metalaxyl or mefenoxam, control was not optimal.
Some of the strobilurins are also good on Phomopsis, a fungal disease that is seed borne. Seed lots with less 70% germination should not be planted, but those with 70 to 90% germination can see an improvement in germination when treated with pyraclostrobin (BASF) but not azoxystrobin (Syngenta) or trifloxystrobin (Bayer). OSU researchers aren’t sure why there is specificity here, but there is.
- Fludioxinil (Syngenta): This product is sold as Maxim and has and continues to have excellent activity towards Fusarium and Rhizoctonia as well as seed borne Phomopsis and Sclerotinia.
- Sedexane (Syngenta): Newer product and new mode of action on the market also has good activity towards Rhizoctonia.
- Ipconazole (Valent): Another new seed treatment compound that has good activity towards Fusarium and Rhizoctonia.
- Penflufen (Bayer/Pioneer): A new seed treatment compound targeted towards Rhizoctonia sold as EverGol Prime.