Old 05-09-2013, 04:41 PM
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RigglePLC RigglePLC is offline
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Dimension (dithiopyr) on new grass

I grew Scotts perennial ryegrass in a shallow pan outdoors in potting soil. It was seeded April 8 and was up about 2 inches tall by May 5. I then treated it with Shaws 26-0-6 with .1 percent Dimension (dithiopyr). I treated it by placing the pan in the path of a hand-carried Scotts fertilizer spreader when I treated a larger lawn area. The spreader was set at 4, out of a maximum setting of 5, previously found to apply about 4 pounds per thousand sqft, (usual rate in this state). About 20 particles fell into the pan of soil. After 4 days there was no apparent injury to the seedlings.

In a similar test, 4 particles of the above crabgrass control with Dimension were added to three small cups of Scotts Perennial Ryegrass seedlings grown outside over the winter as a winter seeding test. The grass was about 2 inches tall by the treatment date. I used seed planted in March, January and November. Grass was about 2 inches tall. So far,(after 4 days) there is no apparent injury to the new grass sprouts.
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Last edited by RigglePLC; 05-09-2013 at 04:44 PM. Reason: add
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Old 05-10-2013, 01:03 AM
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DA Quality Lawn & YS DA Quality Lawn & YS is offline
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Good experiment sir. So the grass is about a month old from germination? And no injury?
Helpful to know what the waiting period is between seeding and doing a pre app.

Would you be able to replicate this, and try Barricade in addition to Dimension? And perhaps try a 2 week post emergent interval?
Would be interesting to see how close you can get to germination and still cause no definitive injury.
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Old 05-10-2013, 10:24 AM
greenskeeper44 greenskeeper44 is offline
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I treated a yard this march with barricade .38 @ 4lbs/1000 so a 4 month control and the customer called and asked if he could broadcast some turf type tall fescue seed on a few bare spots...I told him it wouldnt come up but he did it anyway and when I went there this week for the 2nd app it was up and about 2" tall.....I would like to see how the seedlings in your study progress through summer conditions....it seems like you could get shoot growth but it would have to have some effect on the roots? Unless all this pre emergent is bullshit.
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Old 05-10-2013, 12:07 PM
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RigglePLC RigglePLC is offline
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I will be out of town for a few days, and cannot water the grass. Sorry I have no Barricade to experiment with. Yes, I want to try it on grass that is even a bit younger, and see what happens after a few more weeks. Later this year--during hot weather--the new grass will come up in about 4 days. Good time for a test.
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Old 05-10-2013, 08:21 PM
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Kudos to the OP. Good thread.
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