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Old 07-29-2013, 11:43 PM
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RigglePLC RigglePLC is online now
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Dimension test

Dimension as Shaw's 19-0-6 with .1 percent Dimension was applied at .21 and .42 lb/Ac as dithiopyr active ingredient. I treated 3 feet square areas in early May. It was weighed and hand sprinkled criss-cross; 20 grams and 40 grams. The lawn was neglected, thin, never irrigated and had heavy crabgrass in 2012.

The low rate resulted in numerous crabgrass plants. The high rate prevented most crabgrass. Untreated areas outside the plots had heavy crabgrass. Stage of growth when photographed was just before the seed heads developed.

Weather was dry and up to 94 in previous weeks, but rain showers and temperatures in the low 80's had occurred in the previous 10 days.
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Old 07-30-2013, 12:13 AM
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Looks like the higher rate did the trick. With all the rain here this year everybody has crab breakthrough. Most guys here use dimension. What is everybodys general thoughts on the best pre? Is it dimension, barricade or??????
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Old 07-30-2013, 01:32 AM
turfmd101 turfmd101 is offline
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Dimension IS the best for crabgrass. All pre-m's work well. It's all about timing per soil temp, along with app rate and irrigated for proper soil bonding. It's all about the application. Molecricket tunneling when surface moisture is abundant will cause a break in the barrier. For that mater any surface soil disturbance will break the barrier. Remember pre-m does not kill dormant seeds or stop seeds that have started germination. Only seeds that start germination while the barrier is active are killed. All variety's of weed seeds ( grassy & broad leaf ) have different conditions which cause their germination. All environmentally dictated. Picking your primary target weed is important. Too much diversification in seed germination for 100% control. That's why split applications are important. Always use the high rates for optimum control. You never know what the environment will throw at you.
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Old 07-30-2013, 09:01 PM
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Actually at the .42 rate, there is a clump of weedy grass at lower left--it is orchard grass, and along the sidewalk there is a clump of crabgrass. In the center there is some oxalis. Hopefully I will have a good picture this fall when the difference will show up nicely.
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Old 07-30-2013, 10:30 PM
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Michigan State showed that aerating after the pre-emergent was applied has little to no change on the effectiveness on the barrier. I have had better luck with Prodiamine than Diothyper.
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Old 07-31-2013, 06:14 PM
turfmd101 turfmd101 is offline
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Quote:
Originally Posted by FdLLawnMan View Post
Michigan State showed that aerating after the pre-emergent was applied has little to no change on the effectiveness on the barrier. I have had better luck with Prodiamine than Diothyper.
I'll bet the manufacturer has different research to Michigan state's research. Soil disturbances is detrimental to all pre-m's.
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Old 07-31-2013, 09:19 PM
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RigglePLC RigglePLC is online now
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I am not so sure about aeration destroying crabgrass prevention...but...power edging can result in a solid row of crabgrass along the concrete.

Speaking of power edging and crabgrass.
Does anybody know?
How late in the summer is it necessary to edge in order to result in no crabgrass along the edges. One month before frost? 8 weeks?

How late in spring must you stop edging to prevent crab along the edging trench?

Last edited by RigglePLC; 07-31-2013 at 09:23 PM. Reason: add
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