A test was conducted in a large block planting of Scots pine at
Horing State Farm near Plattsmouth, Nebraska, from 2003 to
2005. Many trees within the planting and surrounding areas
had died from Pine Wilt in the previous two to three years.
Twenty-nine like-size trees with no symptoms of Pine Wilt
were selected. Eighteen of the trees were untreated, serving
as control trees. Eleven of the trees were treated once at the
beginning of the test period with trunk injections of
ArborSystems Greyhound Insecticide.
The trees were inspected after one, two, and three years, with
mortality rates noted each year. At the end of three years, only
three of the eighteen (3 of 18) control trees were alive—a
16.7% survival rate. Seven of the eleven (7 of 11) treated
trees were alive for a survival rate of 63.6%.
This test was conducted by the Nebraska Forest Service, University of Nebraska, Lincoln.
See the full report here. |