I recently had a discussion with a consultant about rates of products applied in the seed furrow. Twin rows complicate use of pesticides compared with single rows because rates are often prescribed on a per acre basis and you are dealing with twice as many furrows across the field in the twin row operation. If that is the case, to be compliant, you can only use half of the maximum rate allowed under each furrow associated with the twin row planting pattern if the rate is given on a per acre basis. Dr. Anco discussed information on risk to thrips damage in twin rows versus single rows in a previous post (Peanut Notes No. 62.) Rates for inoculants for BNF (biological nitrogen fixation) are generally in amount per linear foot of row (also see Dr. Anco's comments in Peanut Notes No. 50.)

The conversation I had was with respect to Proline and Velum. Proline can be helpful in fields with a history of CBR (black root rot.) Those fields seem to be few and far between at this point in time. Soybeans increase risk for this pathogen but our varieties have greater resistance. The value of Proline will depend on your previous rotation history and whether or not CBR is in the field. The rate of Proline is recommended on a per acre basis (but also provides an amount for linear-foot-of-row.) To be legal, only half of the maximum rate can be applied in each furrow. This would be less expensive but also less effective. Similarly, Velum is recommended on a per acre basis. In a twin row pattern, only half of the maximum rate can be applied in each furrow. This too could lead to less suppression of nematodes (but also a lower cost.)

We have looked at performance of Velum (fluopyram) for many years under different production systems. In some cases, we had high levels of plant-parasitic nematodes. While some nematode populations in soil were lower after use of Velum, we did not see a yield response. We almost always observed a response to crop sequence. But we did not observe a yield improvement from Velum.

Here are the titles and links to the published papers if you are interested in digging in deeper.

Foote, E., D. Jordan, A. Gorny, J. Dunne, L. Lux, D. Ahumada, B. Shew, R. Brandenburg, W. Ye (2024). Influence of cropping sequence and tillage system on plant-parasitic nematodes and peanut (Arachis hypogaea) response to fluopyram applied at planting. MDPI Agronomy, 14(4), 875,

Foote, E., D. Jordan, A. Gorny, J. Dunne, L. Lux, B. Shew, and W. Ye. (2025). Previous cropping sequence affects plant-parasitic nematodes and yield of peanut and cotton more than continuous use of fluopyram. MDPI Crops, 5(2), 12,