POLYON® Controlled-Release Fertilizer Sparged with Ronstar+Barricade
3/30/2023 - By Dr. Jeff Atkinson
Study: Effect
of Harrell’s fertilizer double-sparged with Ronstar (Restricted Use Pesticide) + Barricade on preemergence
crabgrass and goosegrass control.
Location: University
of Tennessee – Knoxville, TN; LaFollett Country Club – Lafollett, TN
Collaborator: Jim
Brosnan, Ph.D.
Date: April
– August 2021
Treatments:
|
Treatment* |
Rate – lb/A |
Timing |
|
Nontreated |
- |
- |
|
Ronstar 1% mini |
200 |
16 March (crab); 14 April (goose) |
|
Ronstar 1% + Barricade 0.33% mini |
200 |
16 March (crab); 14 April (goose) |
|
Ronstar 0.75% + Barricade 0.25% reg |
267 |
16 March (crab); 14 April (goose) |
|
*All
treatments received similar fertility through the duration of the trial. |
||
Result: Plots treated with Harrell’s fertilizer double sparged with Ronstar (Restricted Use Pesticide) 1% + Barricade 0.33% at 200 lb/A or Ronstar 0.75% + Barricade 0.25% at 267 lbs/A provided superior preemergence crabgrass control and equivalent goosegrass control to plots treated with Harrell’s fertilizer single sparged with Ronstar 1% applied at 200 lb/A (Figure 1-3).
The results suggest applying Ronstar (Restricted Use Pesticide) at 2 lb ai/A in combination with Barricade at 0.66 lb ai/A as part of a Harrell’s double-sparged fertilizer blend can provide better preemergence crabgrass control than Ronstar (Restricted Use Pesticide) applied alone at 2 lb ai/A.
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