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Rain and herbicide

4K views 22 replies 9 participants last post by  RigglePLC 
#1 ·
Rain (in the form of water from a sprinkling can) was applied at 5 minute and other short intervals after application of a 3-way herbicide on dandelions. The herbicide was Ace Ready-to-use Spot Weeder. (2,4-D, MCPP, dicamba). About 1 percent surfactant was added to the weed solution. The water applied amounted to about a half-inch of water.

After 7 days all treated weeds showed evidence of the herbicide effects. This happened in spite of the short intervals before "rain".

More results will be shown later, when some of the weeds should be dead.

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#2 ·
Rain (in the form of water from a sprinkling can) was applied at 5 minute and other short intervals after application of a 3-way herbicide on dandelions. The herbicide was Ace Ready-to-use Spot Weeder. (2,4-D, MCPP, dicamba). About 1 percent surfactant was added to the weed solution. The water applied amounted to about a half-inch of water.

After 7 days all treated weeds showed evidence of the herbicide effects. This happened in spite of the short intervals before "rain".

More results will be shown later, when some of the weeds should be dead.

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Nice little test you did
I have found over the years, 15 min is usually the cutoff to effectively kill the weeds if they were dry at time of app and it rains after. Shorter then 15 mins and most always seem to live.
 
#3 ·
Dandelions were transplanted from a weedy lot to flower pots. They were sprayed with Ace ready-to-use 3 way herbicide. I added about 1 percent surfactant. The weeds were then transferred to under a spray-head irrigation area, at intervals. They were placed under the "rain" at 5,15,30 and 45 minutes after the herbicide was sprayed.
The difference was not clear, but all were affected to some degree.

I am retired--not a business--a hobby now.

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#11 · (Edited)
Dandelions, or a similar weed, were treated with a ready-to-use three-way herbicide. Weeds were treated and then washed with water to simulate rain. The intervals were: untreated control, no rain, and 1,5,10,20 and 30 minutes. Most were obviously affected. No weeds appeared to be dead at this date, 18 days after treatment. Weather has been mostly cool and with a few light rains. Temperature was 69 F at the day of the photograph.

Upon close examination, weeds at 1 and 20 minutes were not the usual dandelions--or at least not the usual species. Possibly chicory, See the tall stem of an untreated, unmowed specimen--clearly not a dandelion.

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#12 ·
Oxalis was treated with a generic three way (ace Hdwe, ready-to-use)), and then sprinkled at 5 minute intervals to simulate rain. When there was no "rain" the oxalis collapsed quickly; at 5,10, and 20 minutes there were less effects, but still likely to kill the oxalis weeds. Fabric used for photo contrast.
This oxalis was the tall spindly type found in heavy shade.

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#14 ·
This tall oxalis may be a different species.
Maybe I can do the same test with a more common oxalis. Maybe I will have to transplant it close together for easier photography. Or maybe find some clustered close together. Or maybe I just need 4 photographs.

I did the same test on some extra large dandelions today--clustered close together for easy photography. I can show results in a few days.
 
#15 ·
A new dandelion, 3-way, and rain test--showed results after 48 hours. Dandelions that were clustered together for easy photography were treated. The dandelions were 12 inches across, mature--2 years old, maybe more. They were sprayed with Ace 3-way, ready-to-use, with about 1 percent non-ionic surfactant added. One squeeze of the trigger. Rain, in the form of about a gallon of water from a sprinkling can was applied at intervals of 5, 10, 20, and 30 minutes. All were affected by the herbicide. The differences were not yet obvious. The temperature was about 85, non-irrigated, no natural rain.

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#17 ·
This photo shows the results at 6 days after treatment with a three way. Large mature dandelions were sprayed.
What happens if it rains following a treatment for weeds?
Rain was simulated in the form of one gallon from a sprinkling can at intervals of several minutes.

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#20 ·
Rain (in the form of 1 gallon of water from a sprinkling can) followed herbicide treatments (ready to use 3-way) at intervals of 5,10, 20 and 30 minutes. Large, mature dandelions were selected to be about the same size and clustered together for easy visual comparison.
After 13 days the UTC (no rain) treated weed was nearly dead. The remaining weeds were all affected, but not yet dead.
Center: No rain, upper left 5 min, upper right 10 min, lower right 20 min, lower left, 30 min.

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#23 ·
I tested rain after spraying with a 3-way herbicide on large mature dandelions. They were rained on with one gallon of water after intervals of minutes. The recent weather has been warm and dry. At 24 days, the "no rain" (0) dandelion is dead, nearly destroyed. The others at intervals of 5,10,20 and 30 minutes were affected, but are not yet dead.

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