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Page: of 12

Gna CE BAe ua ORF eet eee Pee
PERIODICALS SECTION
CAL. ST, LIBRARY
-SACTO. CAL.
Seevial ‘the cominuaities of Nevada: City, ‘Grass Valley, Red Dog, You Bet, Town: Talk, ‘Glenbrook, Little Yori Chestes; Aesonky Flat; sivecian: Alpha, sees,
French Corral, Rough a
Hill; Gold. Flat,
"VOUUME 49
Ready, Graniteville, North San Juan, North Bloomfie Humbug, Relief H
Union Hill, Peardale, SaummitCity, Walloupa, Gouge Eye, Lime Kiin, : Oe Wolbrchadcace .
. Soggsville, Gold Bar, Lowell Hill, Bqurbon Hill, Scotch Hill, North. n Columbia, Columie Hil
weil Indian Flat, Bridgeport, Birchville, Moore's ges Orleans’ Flat, Remington t Hill, Anthony House, De 7: Delitum Tremens,
rae
ngton, Blue’'Tent, La Bafr Meadows, Cedar Ridge,
‘Liberty. ‘Hill, ‘Sailor Flat, Lake City, Selby Flat, Grizzly
Brandy Fiat, Sebastopol, : Quaker Hill, Willow Valley,
"WEDNESDAY, FEBRUARY Js. 1970 NUMBER 5: 57
TREES "ARE “this ‘weeks theme of The Nugget. Photos throughout this issue of the Golden
Empire reflect rst net imap: setting with homes. This photo was taken in the Alta Sierra
area, ~ (Photo by Dianna Davis)
“10 we A (Copy “Published Wednesdays. } Nevada Cit :
Pine bark. beetles
serious threat here
A tiny beetle can cause havoc
in'a stand of pine trees, and the
’ nasty little insects are prevalent in the Golden Empire, Grass
Valley Lions were told last week.
The Lions heard from Gary
Pitman, entomologist at Boyce"Thompson’s North Star Experi' mental Forests at the south
. edge of Grass Valley. .
PINE TREES are common in the Golden Empire as are the Oaks which give this Alta Sierra
home a setting of its own.
Pitman described the institute’s experiments in eradication measures against the pine
bark beetle, which can and has
killed many trees here and in
‘other areas.
The seriousness of this pest.
is that seven times as many
trees die annually from beetle
infestations as from forest fires,
Pitman said. ‘‘They are not
conspicuous there isno smoke.
_= but check the brown-topped
trees in July,” he said.
Pitman commented that several brown-topped trees just
off the freeway at Brunswick
Road have been killed by pine
park beetles which congregate
in droves of 2,000 to 3,000 on
a single tree, bore into’ the
bark and wipe out the tree.
Damage to pines in Idaho has
been extremely serious, and in
Honduras, an epidemic became
so bad that the beetles were
200,000 trees'a day.
‘‘When a few. thousand of them
congregate on one of your trees,
your tree is out of business,”
Pitman. added. ‘‘By the time
the tree .turns brown, it has
been dead quite a while.’’
Thus, the key is ‘‘prevention
rather than treatment,”’ he said.
It. was. indicated. that. the
beetles sense and. select a tree
that is weak, tending to leave
stronger ones alone,
Thus, homeowners should not
top pine trees if possible and
should not dig around them, disturbing the roots and weakening
the tree.
Pitman said insecticides are
important in controlling these
insects because the beetles only
spend one per cent of their time
flying from tree to tree, The
rest is spent under the bark
where insecticides can't reach
them effectively.
Boyce Thompson has been
experimenting witha chemical
preparation to duplicate the female scent which attracts the
beetles. This scent is placed
in mechanical traps ‘‘to which
we hope to lure them in and
destroy them.”
If a tree has died from beetle
infestation, the. best thing the
the ‘homeowner can do is
tree down and destroy.the beetles by burning or some Other
method. This prevents them
from spreading to other trees,
Pitman concluded,