Mr. Rawles:
I recently attended a forestry conference where Doug Freedman of Harrisburg,
Oregon was speaking. He is the owner of RCO Inc., a company that deals with
varmint problems on an industrial scale. Here are some of the notes that were
taken
at his presentation: You start doing some of the math on the breeding numbers
these guys could produce and it is flat scary. (Please note that if errors
exist, it is due to my rapid note taking rather than a lapse by Mr. Freedman,
who is an expert
in his field. )
Pocket Gophers:
Tunnels: are 80-800 feet long-random in direction and consists of main and
lateral tunnels. They make 2-to-3 mounds per day-moving two tons of soil per
year.
Food: 3-5 food caches per tunnel system. They like tuberous plants ( particularly
thistle he said ). They introduce their own habitat ( i am assuming ala war
of the worlds )
Life cycle: multiple litters per year breeding starts in March and June. 19
day gestational period with 3-to-7 per litter. Mature dependency from adults
in 40 days. Sexually mature in 1 year and they live 2-5 years.
Traps: control and trap both directions and place in main tunnels. Can use
mouse traps on incline with strings tied to them. They patrol their tunnels
2-3 times per day ( very territorial ) if they see light they will investigate
why a tunnel is opened.
Baits: Bait only main tunnels use strychnine and PREMIUM grade oats. Higher
quality oats and freshness = palatability.
Control: remove forbes with tap roots
Voles:
Habitat: Live above or below . Like a 14" canopy of grass golf ball sized
holes. Can burrow 5-6 feet. Groups of 7-8 rodents nest together in winter
Food: tend to girdle seedlings and small trees. also may eat some grass ( unsure
on this one )
Life cycle: 19 day gestational period. They have 6-to-7 litters per year.
Can re-breed in 20 hours.
Control: cut grass below 10"
Baits: Zinc Phosphate.
Ground Squirrels:
Damage: They can carry the Plague. Forage on grain crops. Holes damage farm
machinery. Have been known to damage dikes.
Habitat: Live above and below ground tunnels 15 feet long
Food Grass and grains
Life cycle: 1 litter per year usually 5 per litter
Baits: strychnine. Below ground only. Bait in summer to late fall. Place unpoisoned
grain in an area to get them used to feeding in a spot. Then place the poison
and get the whole family. can trap and shoot also can fumigate. Some have tried
the ol propane wand and suffocation. Others have tried to ignite the burrows
(Not suggested ).
Thanks Much, - E.B. in N. Idaho