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Old 05-31-2012, 10:51 AM
LawnSite Member
Join Date: Jul 2011
Location: New Franklin, MO
Posts: 16
New Tree damage

Hi Everyone.

Yesterday was another day in the field for me. I want to discuss a few points here.

1. Wally, you want to estimate 3 years of additional growth. I have the growth rate for every major tree involved. I use these data in my damage model analysis models. It is very reliable from the USDA and can withstand the scrutiny of the court. Let me know what trees you have and I can send you those growth numbers. But, it is three years, not two.

2. Leaves are fully expanded on most trees here in Missouri and expected 2012 growth is almost complete. I evaluated red maples yesterday. Hope you are all sitting down and your pace makers are tuned up.

From my preliminary work I found a control tree not sprayed with Imprelis, same variety, same soil type, planted about the same time but not sprayed with Imprelis. Then I compared this to trees growing on imprelis lawns.

The Imprelis maples showed no apparent injury if you stood back from a distance. But up close you could see obvious chemical injury. Then, I looked at the annual limb growth.

Each year a limb will grow in response to environmental stimulii, and also be influenced by human factors such as irrigation, fertilizer and chemical applications. Thus, if Imprelis did slow tree growth you could look at the annual limb growth and compare with other trees or with previous year's growth.

There are clear "scars" on the small limbs that show each year where growth stopped. These scars usually look like a cluster of thin rings around the limb. If you take a ruler you can measure each distance between scars and determine annual growth. Try it.

Now, the control Red Maple w/o Imprelis measured about 13 inches long for this years growth. Here are the Imprelis tree measurements for this year. 1.12; 0.5; 0.25 for one tree and 2.0 and 2.25 for the other. About an 80% reduction in growth or more. Then, you can look at 2011 growth, last year, what did Imprelis do last year: 1.87; 1.87; 2.12; on one tree and 2.6; 2.25 on the other.

Here is my first attempt at posting a photograph. The treated tree limbs are two years of growth. The center limb, not treated, is just from this year's growth.
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