Friday, October 25, 2013

Drywood Termite (bukbok) Control: What are the Options

Many residents will experience a drywood termite infestation in their home. Unlike subterranean termites which require excess moisture, drywood termites spend almost their entire life cycle inside the sound, dry wood members upon which they feed. Only during brief swarming flights do young adults leave the confines of their galleries to begin new colonies elsewhere. Winged adults or "swarmers", shed wings, ejected pellets, and galleries inside wood are typical signs of a drywood termite infestation. Swarming ants are sometimes confused with termites, but their differences are easy to recognize.

fecal dropping of "bukbok" or drywood termites
If a drywood termite infestation is suspected in your house, a thorough examination of the entire structure should be conducted by a pest control operator or building inspector. To provide a valid report, the inspector must hold a State-issued wood-destroying organism inspection card and be personally licensed in the termite category or be supervised by such a licensee. A careful inspection is critical in order to determine the extent of an infestation and location(s) of other possible drywood termite colonies. The results of the inspection will dictate the best treatment option(s) as no single control method is best for all situations. Most companies offer only one or a few of the methods discussed herein, therefore, it is prudent to contact several companies for inspections and treatment recommendations before choosing the company and specific treatment which best fit your needs.

Drywood termite treatments are divided into three general categories which reflect their areas of coverage: whole-structure, compartmental, and local or "spot" applications. Preventative treatments are also available and are usually offered after an existing infestation has been treated. All treatments listed below will kill drywood termites, but their effectiveness is limited when used beyond their intended scope. 

WHOLE-STRUCTURE 

Fumigation. Fumigation ("tenting") has been the only method used for over forty years which insures complete eradication of all drywood termites from a structure. The phase-out of methyl bromide in the U.S. has positioned sulfuryl fluoride (Vikane®) as the leading gas fumigant. Fumigation is a highly technical procedure which involves surrounding the structure with a gas-tight tarpaulin, releasing the gas inside the seal, and aerating the fumigant after a set exposure time. Before fumigation, the homeowner must remove all plants and animals from the house, remove or place food items inside special protective bags, and insure that there is sufficient tarp clearance between sensitive landscaping and exterior walls. The fumigation company may monitor gas concentration during the fumigation to insure that a sufficient dose is maintained. Only after the house has been aerated and tested for absence of fumigant can it be reoccupied. Because the fumigant is a true gas and works as a component of air, no cleanup of clothing, dishes, floors or other surfaces is needed. 

COMPARTMENTAL

Heat. Heat treatments are used to eradicate drywood termites from portions of a house such as an attic, porch, or bedroom, or from an individual apartment or condominium unit inside a multi-family dwelling. Heat sensitive articles are removed and the infested area is cordoned off with polyethylene or vinyl sheets. Temperature probes are placed in the hardest-to-heat locations and heat is applied with a high-output propane heater. After a lethal target temperature is achieved, the area can be cooled quickly for immediate reoccupation. If a heat liable material cannot be removed, it must be thoroughly protected with insulating blankets.

LOCAL

Wood Injection. Wood injection or "drill-and-treat" applications have been used since the 1920s to treat drywood termite infestations which are accessible and detectable. An insecticide is injected into small holes drilled through any wood surface into termite galleries delivering the treatment directly to the pest population. This is the simplest and most direct method of treatment. The amount of drilling required and the effectiveness of this treatment depends on the chemical used and the nature of the infestation. Most chemicals will remain active in the wood after treatment to thwart resurgent colonies.

Borates. Spray and foam applications of products containing boron salts are applied to raw, uncoated wood surfaces. Because penetration depths of borate solutions and depth of drywood termite galleries vary, injection into existing infestations should also be performed (see also wood injection above and preventative treatments below). 

Wood replacement. This method allows for absolute removal of a drywood termite infestation if it is isolated to a wood member which can be detached relatively easily, as for example, a fascia board or a door. Make certain that there are no galleries leading to adjacent wood members, otherwise, they will also require treatment or removal.

PREVENTATIVE TREATMENTS 

Pre-construction. The most effective prevention for drywood termites can be "built-in" to a home during its construction phase. Pressure-treated lumber should be installed wherever building codes allow. In the framing stage, all untreated wood can be sprayed with borate solutions.

Post-construction. It is impossible to treat all wood in a completed house with residual chemicals. Exposed, unfinished wood can be sprayed with borates which repel swarming termites, but keep in mind that untreated wood may still be susceptible to infestation as the borate spray residue will not kill wandering adults on contact. Wall voids and attics can also be sprayed or dusted with various residual insecticides which kill swarming adults in search of a nest site.

We use Wood Pro to treat Drywood termite infestation
TREATMENT VERIFICATION

Because drywood termites are hidden inside the wood they infest, it may be difficult to immediately verify the success of a given treatment. A swarm within a few years of treatment suggests either that the treatment was unsuccessful, infested wood was brought in, or a hidden, untreated, infestation was present and must now be treated. Accumulation of pellets, especially in a cone-shaped pattern, is also a sign of active drywood termites. All pellets should be removed after a treatment to insure that colony activity has ceased. A retreatment is warranted if new pellets are observed. Pellets may continue to trickle from wood after successful control if the wood member is periodically subjected to vibrations or jarring such as a door or door frame. Should you want to know more or have a free survey of your house, please contact us now at (033) 337-1117 or Mobile # 0927-5460608 nationwide. 

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