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TRADITIONAL -INSECTICIDE TREATMENTS : TERMITES
TERMITE CHEMICALS-termiticides-an overview
CONTROLLING TERMITES-liquid barrier treatments
TERMITES- Renovation and Construction Considerations
TERMITE CHEMICALS-TERMITICIDES-AN OVERVIEW
For many years, the traditional method of controlling subterranean termites was to apply a liquid pesticide, known as a termiticide, to the soil. It has worked by applying a chemical barrier around and beneath the structure in order to block all possible routes of termite entry. Any termites attempting to penetrate through the treated soil were either killed or repelled.
However, there are many obstacles to forming such a barrier. Many possible termite entry points are hidden behind walls, floor coverings, and other obstructions.
Even where access for treatment is possible, it is difficult to uniformly wet soil and achieve thorough coverage. A typical "barrier" treatment may involve hundreds of gallons of solution injected into the ground alongside the foundation, beneath concrete slabs, and within foundation walls. Considering that termites can tunnel through small untreated gaps as narrow as pencil lead in the soil, it is understandable why the traditional/ barrier liquid treatments have failed to correct termite problems at times.
DRENCHING / DRILLING METHODS
Click on image to enlarge
Click
on image to enlarge
Most termiticides are not as stable in most soils as termiticides which were manufactured prior to 1989. Chloronated hydrocarbon insecticdes (termiticdes) like chlordane, aldrin, lindane, etc. were known to have tremendous stability in soils and lasted a lot longer than the present termiticides.
The same qualities which made them good termiticides also made them environmentally unsafe. Chlordane got the bad reputation from wide misuse and was taken off the market in the USA.
There are several different insecticides used by pest control operators for soil treatment for termites currently. All are safe and effective when used according to label directions. The insecticides remain effective in the soil for approximately 5 to 10 years. Each product has slight advantages and disadvantages.
A brief Termite Control Chemical Table list some of the commonly used termiticides and the manufacturers.
Effective termite treatments require a great volume of termiticide. For example, a single-story house that is 1200 sq. ft. (40' x 30') can require 112 gallons of diluted termiticide just to treat the soil along the foundation walls (inside and out). The total gallons needed may exceed 150 gallons depending upon the construction of the house.
The physical and chemical nature of your soil surrounding your home
can impact the effectiveness of the chemicals stability with respect to
time. Soil clay content, pH, Organic matter content, particularly organic
carbon content will greatly influence the rate of break down of the termiticide
in soil.
You can consult your local land grant-extension entomologist to evaluate
your soil. Soil samples can be inexpensive, some may be free, allowing
you a more informed choice.
Baiting for termites, although generally more expensive, may be a better
alternative.
For an excellent article: Fate
of Insecticides Used for Termite Control in Soil, by Shripat T. Kamble
Extension Specialist, Univ. of Nebraska,covers the different soil conditions
affecting current termiticides. CONTROLLING TERMITES: WITH LIQUID TERMITICIDES-TRADITIONAL
/ BARRIER TREATMENTS
1. PRE TREATMENT: for PRE CONSTRUCTION
TREATMENT OF STRUCTURES.
Homes and other buildings can be pretreated at the time of construction
to protect them against termite attack.
After the footings are poured and the foundational walls and /or piers
have been constructed, apply the termiticide such as PERMETHRIN
SFR (36% Permethrin ) or DEMON
TC to a trench in the soil about 12 inches wide and 6 inches
deep adjacent to the foundation.
Soil on both sides of the exposed foundational walls and soil surrounding
should be soaked down to the foundation footing at the labelled rate.
Apply at the diluted rate. Poured in with a watering can or bucket
is easier than using a sprayer.
No need to dig the trench any deeper than the top of the footing.
Soil at the bottom of the trench can be loosened with a spade or iron
bar to allow further penetration.
For outside basement walls(where the footing is deep) most pest control
operators apply the chemical by injecting it along the foundation through
a hollow rod attached at the end of the hose in place of a soil nozzle.
This is called "rodding". The result is a continuous chemical barrier
from footing to surface.
This should be applied to both the inside and outside of the foundation
and also around piers, chimney bases,pipes,conduits,and other structures
in contact to the soil.
Use at the rate of 4 gallons per 10 linear feet. The diluted termiticide
should be mixed in with the soil, as it replaced.
For effective pretreatment termite proofing, much of the chemical barrier
needs to put under the concrete slabs. Obviously it is easier to put out
the barrier treatment BEFORE a slab has been poured. AFTER
it has been poured, it will need to be drilled and a
chemical injected under the slab to seal off termite entry points.
This is not a "do it yourself project".
Apply a diluted termiticide such as PERMETHRIN
PRO( 36% Permethrin ) at the rate of 1 gallon per 10 sq. feet,
covering the square footage.
Along both sides of the foundational walls and interior foundational
walls and plumbing, apply this diluted rate at the rate of 4 gallons per
10 linear feet.
A HOSE END SPRAYER hooked up to your sprayer,
makes this job a lot easier.
Termites "Bite" into Pocketbook by Barb Ogg, PhD, Extension Educator,
Lancaster County Extension Office and Dennis Ferraro, Extension Educator,
Douglas County Extension Office, talks about the amount of termiticide needed
to do the job correctly.
RETURN
TO TOP
2. POST CONSTRUCTION TREATMENT OF STRUCTURES:
Dig narrow trenches along both the inside and outside of foundation walls and around piers and chimney bases,applied at the rate of 4 gal. per 10 linear feet.
Also be sure to trench and treat around sewer pipes, conduits and all other structural members in contact with the soil.
The trench should be as deep as the top of the footing.
Mix the termiticide with the soil as it is replaced.
The State regulations differ state to state on treatment and drilling activity required.
In certain areas of the country you may encounter different types of termites, such as Formosan, dampwood, drywood, etc. If your home is infested with one of these termites, it may require different or more extensive treatment procedures including wood treatment and fumigation.
CONSTRUCTION CONSIDERATIONS-TERMITES
Changing the soil along the foundation such as digging or removal of treated soil can encourage termites to your home.
Disturbing the termite treatment may void any termite warranty that you may have on your home.
An excellent article about renovations and home construction by Michael
Waldvogel, North Carolina Entomology Extension Specialist, can be found
at :
Termite tips-constructions
WOOD TREATMENTS
Treating the wood is an alternative to soil treatments.
However, it must be emphasized that these "spot" treatments on the wood is not a complete termite treatment in that it will not stop the termites from attacking the wood in other areas.
One treatment option uses the chemical disodium octaborate tetrahydrate (DOT). Common ones are BORACARE and TIMBOR
Both products are borax based and must be applied to untreated wood . Important areas for treatments could be in the crawlspace and parts of the framing in a house under construction.
Data provided by product manufacturers indicate that termites do not extend their tubes over treated wood nor do they cause any structural damage.