Termite research done in Arizona by Joe DeMark Field Scientist, Dow AgroSciences
Development of new termite control technologies requires corresponding proof of efficacy for regulatory officials, pest management professionals and their customers. In 2008, a new test protocol was established by the Termiticide Scientific Review Panel (TSRP), an independent panel of termite experts selected by the Association of Structural Pest Control Regulatory Officials (ASPCRO). The TSRP protocol includes a scientific protocol to test the validity of new termite control concepts, including baits. The protocol sets the minimum number of field studies needed across the United States and the minimal results required in those studies to demonstrate efficacy. The final field protocol was reviewed and approved by both the TSRP and the U.S. Environmental Protection Agency (EPA).
One requirement in the protocol for baits is testing at three different types of sites: remedial (structure infested at time bait was installed); preventive (structure not infested at time of installation); and placebo (control with no bait to demonstrate termites are present and feeding in stations). The overall TSRP performance hurdle is elimination of 85 percent of the original termite colonies within one year (elimination of termite colonies feeding at the site when baiting was initiated).
Arizona challenge
The Sentricon® System with Always Active™ technology was the first bait system to undergo testing using the TSRP protocol and it was tested against all major subterranean termite species in the United States. Introduced in 2010, Sentricon with Always Active technology provides bait at installation making the active ingredient immediately and continually available to termites. Always Active label directions allow inspection at an interval of up to once per year. This industry-first annual label for a termite bait label is based on Recruit® HD, a highly-durable bait containing noviflumuron, the same proven active ingredient used in Recruit IV termite bait. Each Recruit HD bait tube consists of 150 grams of refined cellulose and binder with 0.5 percent noviflumuron. In field tests across the United States, the patent-pending bait has remained effective for several years, even under high moisture conditions such as would be created by regular lawn irrigation on some properties in Arizona.
Arizona poses a challenge for any termite bait technology as the state’s most common structural termite species is the desert subterranean termite (Heterotermes aureus), which is known for having colonies that are generally smaller than other subterranean termite species, and colonies that are less aggressive, often feed less and are considered skittish when their environment is disturbed during routine service calls.
Another challenge for research in Arizona was the documentation of targeted colonies as required by the TSRP protocol. The preferred colony identification technology is DNA analysis, but colony identification using DNA marking for H. aureus had not been developed. To overcome this hurdle Dow AgroSciences contracted with Dr. Ed Vargo at North Carolina State University to establish DNA testing method for H. aureus. This foundational research now makes DNA marking available for future research involving desert termite biology and behavior.
No-choice laboratory tests have demonstrated that desert termites readily consumed Recruit HD. At six weeks in the no-choice study, desert termites consumed 3.96 mg of Recruit IV termite bait, used in the Sentricon System since 2005, but 15.07 mg of Recruit HD, now used in the Sentricon System with Always Active technology. Termite mortality was 100 percent for all termites that consumed Recruit IV or Recruit HD.
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Filed under: Vender | Tagged: AZPPO, baits, damage, desert termites, Dow AgroSciences, H. aureus, Joe DeMark, NPMA, Recruit, Recruit HD bait tubes, termites, wood | 3 Comments »