Once again, the Environmental Protection Agency (EPA) approved a Section 18 Emergency Exemption for Sivanto Prime use against sugarcane aphid on sweet sorghum in 2020. This is the fifth year in a row that the Kentucky Department of Agriculture (KDA) has been able to obtain this approval from the EPA on an emergency basis.
Without this tool to manage sugarcane aphid on sweet sorghum, it would be difficult to reliably raise this crop in Kentucky.
In order to use the Sivanto Prime on sweet sorghum, applicators must be private or commercial certified applicators and be in possession of the section 18 label. The application rate range is from 4.0 to 10.5 fluid ounces per acre. There is a 21-day pre-harvest interval (PHI) and a minimum 7-day re-treatment period.
The residual activity for this pest is typically close to 21 days for a single treatment, so a short retreatment interval should not be needed. There is a maximum limit of 4 applications or 28 fluid ounces per year, whichever is reached first.
As a threshold for making the decision to spray, UK entomologists are suggesting the following: 30% of the plants with leaves have colonies of 50 or more aphids on average. Last year, not all of the fields that were monitored needed to be treated, so scouting is important. Sugarcane aphid populations seem to increase rapidly at or after the booting stage.
Growers using Sivanto Prime on sweet sorghum need to report the amount used and the number of acres treated; the KDA must relay this information (the state-wide total acres treated and total amount of product) to the EPA at the end of the year.
This information will help in the future when applying for other section 18 emergency exemptions by showing there is a real need for the section 18 approval. This application information can be reported to me (email@example.com) or Michael Williams (Michael.R.Williams@ky.gov) at the KDA.