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Aerial Spraying
by Marya Tyler 


April 14, 2005

Another reason not to poison the alder on Long Island: This USFS photo shows the positive effect that alder has on coniferous tree growth. 

The arrows point to a narrow strip of Douglas Fir which was inter-planted with alder, surrounded by smaller Douglas Fir which were planted at the same time, but without alder.

By the time these photos were taken 60 years later, the alder had been almost entirely replaced by the conifers, but the nitrogen provided by the alder through the years continues to affect the conifers' growth.

A close-up of those same trees:

Inter-planted with Alder

Planted without Alder


More on this can be found at

Marya Tyler 
Ketchikan, Alaska


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