CN101123997A - Method for controlling termites using liquid termiticide in poison bait - Google Patents

Abstract

The present invention relates to a method of controlling termites, said method comprising placing at a locus where termite control is needed or expected to be needed, a composition comprising a cellulosic material derived from birch (Betula sp.), a binder, and a termiticide selected from the group consisting of chlorfenapyr, indoxacarb, fipronil, a pyrethroid and a neonicotinoid.

Description

Method for controlling termites using liquid termiticide in poison bait

This application claims priority to US Provisional Application No. 60/649513, filed February 3, 2005.

technical field

The invention relates to the field of termite control.

Background technique

Termites are arguably the most destructive of all construction pests. Each year, termites cause an estimated $1.5 billion in damage to buildings, with another $1 billion spent on control. Depending on the termite type, this colony can cover up to 22,000 square feet. Working 24 hours a day, these industrial pests gradually eat wood and any other cellulose-containing material in their environment. Since they've been hiding in dirt pipes or the wood they feed on in the soil, they're often an unseen disaster. There are two types of termites, described below: i) dead wood termites, and ii) subterranean termites. Of the two types, subterranean termites typically live in the soil (i.e., soil-borne), where they tunnel and then form dirt conduits to the timber of structures they then feed on.

In general, controlling native termites is accomplished using a number of different methods. One approach involves the strategy of applying an aqueous solution of at least one termiticide to termite-infested soil. The termiticides used in this method include, but are not limited to, chlorfenapyr, oxadiazole, fipronil, synthetic pyrethrins such as bifenthrin, and newer termiticides such as imidacloprid and acetamiprid. nicotine. These are very effective termiticides suitable for fast acting. The problem with this approach is that the final distribution of the termiticide in the soil is the result of a number of variables: soil moisture, soil type, solubility of the active ingredient in water, formulation and application variables such as application volume, pressure, nozzle type. Due to these variables, the problem arises of areas of control that are not completely covered or that are too low in concentration in the soil. Consequently, termites are able to access food sources/buildings through tunnels and dirt pipes through those uncovered and under-concentrated control areas of the chemical barrier. This method also requires a lot of labor and causes soil pollution.

Another method of controlling termites involves placing stakes or some other suitable termite bait (one such composition is disclosed in US Patent No. 5,573,760 to Thorne et al., the disclosure of which is incorporated herein by reference in its entirety) Insert into the soil around the building to be protected, monitor for termite infestation, and replace the original bait with the poisoned bait in the area where termite infestation was observed. This approach reduces the use of chemicals in the soil, but other problems arise. For example, bait stakes do not provide a continuous barrier around buildings because typically they occupy a limited area, and moreover, they are separated from each other by a distance of about a few feet or even yards. A termite colony in the soil may have difficulty locating bait stakes, especially if the bait stakes are widely spaced and positioned at predetermined distances, regardless of building surroundings that facilitate termite infestation, such as wet area. Also, movement of the termite stake (replacing it with poison-containing bait) can disrupt the channel system that the termites may have built to the stake so that re-insertion of the stake could disrupt the flow of termites to the stake. Thorne et al. address these problems in U.S. Patents 5,329,726 and 5,555,672, which disclose insertion into the bottom of a stationary housing that not only includes a removable bait cartridge, but also has multiple extensions to interrupt or block the Termite paths near enclosures.

Typically, poisons used in the bait stake method described above include slow-acting poisons such as hydrazone, insect growth regulators and pathogens. Poisons used in baits for this method traditionally do not include liquid termiticides used in direct soil control (as described above) since termites do not like or feed on those termiticides that are included in traditional bait compositions.

Contents of the invention

It was unexpectedly found that when a liquid termiticide for soil control is combined with a cellulosic material obtained from decomposed birch (Betulasp.), termites prefer and remain tightly bound to the bait composition. In particular, the present invention relates to a method of controlling termites comprising placing a composition comprising a cellulosic material obtained from birch (Betula sp.) at a location where termite control is desired or expected to be desired, Adhesives, and termiticides selected from the group consisting of chlorfenapyr, oxadiazole, fipronil, pyrethrins and neonicotinoids. Other aspects of the invention will also become apparent.

Detailed ways

The present invention relates to a method of controlling termites, said method comprising placing a composition comprising a cellulose material obtained from birch (Betula sp.), a binder, And termiticides selected from the group consisting of chlorfenapyr, oxadiazole, fipronil, synthetic pyrethrins and neonicotinoids. Chlorfenapyr may be present at a concentration of 1-600 ppm, preferably 50-600 ppm. Oxadiazole may be present at a concentration of 1 to 1,000 ppm, preferably 100 to 1,000 ppm. Fipronil may be present at a concentration of 1 to 1,500 ppm, preferably 90 to 1,500 ppm.

The neonicotinoids may be selected from imidacloprid, acetamiprid, nitratethiazide, thiamethoxam, dinotefuran, nitrapyridine, thiacloprid and clothianadin. Preferably, the neonicotinoids are selected from imidacloprid and acetamiprid. Acetamiprid may be present at a concentration of 1-1,100 ppm, preferably 10-1,100 ppm.

The synthetic pyrethrin may be selected from bifenthrin, cypermethrin, hexa-cypermethrin, cyhalothrin, betacyhalothrin, alpha-cypermethrin, perdeltamethrin, deltamethrin, cyfluthrin , β-cyfluthrin, esfenvalerate, fluvalinate, etofenprox or permethrin. Preferably, the synthetic pyrethrin is selected from bifenthrin, cypermethrin, hexocypermethrin and permethrin. Synthetic pyrethrins are especially preferably bifenthrin. Bifenthrin may be present in a concentration of 1-80 ppm, preferably 7-80 ppm. Combinations of various termiticides can be used in the present invention, such as combinations of bifenthrin and acetamiprid.

The site may be a site adjacent to a building infested with termites, a site adjacent to a building where a termite infestation is expected, a site infested with termites, a site where a termite infestation is expected, a monitoring site with active termites, or any area where termite detection or control is desired place.

The binder can be selected from any material capable of kneading cellulosic materials together in a certain shape. The binder can be selected from carrageenan, Terra-Control SC 823 soil stabilizer, polyacrylamide soil stabilizer, microcrystalline cellulose, Walpole sticker, sodium silicate, alginate, Agar, glue, dental impression matrix, hardening agent, and hydrocolloids of their combinations. Preferably, the binder is iota carrageenan or kappa carrageenan. Any amount of binder may be used so long as it is sufficient to knead the cellulosic mass together and allow to set and dry into the preferred shape. These preferred shapes include, but are not limited to, discs, spheres and elongated blocks. Compositions comprising a cellulosic material and a binder are useful in monitoring and detecting termites.

The compositions used in this method may contain other components such as volatile attractants, compressive agents, antimicrobial agents, starches and other fillers.

The composition of the present invention is prepared by mixing cellulosic material, binder, water and termiticide (either as a commercially produced raw material or as a formulated product). The termiticide may be mixed with the cellulosic material or water prior to preparation of the composition.

Shaped articles prepared from the compositions of the present invention may be used in conjunction with any monitoring/baiting system including those sold under the trademarks Firstline ^(TM) and Defender( ^TM) from FMC; Sentricon ^(TM) from Dow and any similarly constructed system. The compositions described herein can be used in the system as a single monitoring element, or discs made from the compositions can be used in conjunction with conventional wood monitoring systems, or at any site at all.

Compositions for use in the present invention may be obtained from commercially available termiticide formulations. By way of example, it was found in the invention that bifenthrin, which is sold by FMC Corporation under the trade name and trade name TALSTAR ^(R) GC FLOWABLE INSECTICIDE/MITICIDE or TalstarOne ^(TM) Multi-Insecticide, has some effect. Particularly preferred formulations of acetamiprid for use in the present invention include, but are not limited to, acetamiprid (trade name and trademark INTRUDER ^™ ), sold as a 70% wettable powder. The termiticide formulations described above are dispersed in an aqueous medium to provide a composition comprising a termiticidally effective amount of the termiticide, which is then mixed with the bait, using methods known to those of ordinary skill in the art.

The following examples further illustrate the invention but, of course, are not intended to limit the scope in any way.

Example 1

Laboratory tests demonstrating the lethality of compositions/baits comprising liquid termiticides A composition comprising 100 grams of ground birch (Betula sp.), 5 grams of iota carrageenan and approximately 228 ml of water was prepared. Sufficient water is added so that the final composition has a dough-like firmness. The various termiticides were mixed in the composition as indicated in the table below. The termiticide is added to the water prior to being added to the composition. Roll out the dough-like composition and cut it into discs. The resulting discs were dried (to about 5-10% moisture content) and placed in petri dishes containing moist soil. A colony of termites is placed on the soil and the percent mortality is measured over time to determine the effectiveness of the composition. Effectiveness was determined against colonies of Reticulitermes flavipes termites and Coptotermes formosanus termites. In all experiments it was observed that termites preferred to remain in close contact with the disc containing the composition of the invention (usually on top of the disc). The killing results of various termiticides and their concentrations are shown in Tables 1, 2, 3, 4 and 5.

Table 1

% termite mortality for compositions/baits comprising chlorfenapyr

termite type Concentration of chlorfenapyr (ppm) 1 day 2 days 3 days 7 days 15 days 17 days C. formosanus 57 1 0 1 20 99 100 571 1 17 61 100 100 100 R. flavipes 57 0 1 4 82 100 100 571 11 89 97 100 100 100

Table 2

% termite mortality for compositions/baits containing oxadiazole termite type Oxadiazole see concentration (ppm) 2 days 7 days 14 days 17 days 24 days C. formosanus 100 18 53 100 100 100 300 1 35 69 69 100 1000 0 2 71 100 100 R. flavipes 100 1 99 100 100 100 300 15 100 100 100 100 1000 36 100 100 100 100

table 3

% termite mortality for compositions/baits containing fipronil

termite type Fipronil concentration (ppm) 1 day 2 days 3 days 7 days C. formosanus 92 twenty four 44 66 100 185 26 40 64 100 369 50 78 96 100 738 6 16 30 100 1476 10 42 64 100 R. flavipes 92 46 92 100 100 185 28 84 100 100 369 74 96 100 100 738 80 96 98 100 1476 80 100 96 100

Table 4

% termite mortality for compositions/baits containing bifenthrin

termite type Concentration of bifenthrin (ppm) 2 days 7 days 14 days 22 days 37 days C. formosanus 7.6 0 0 0 1 89 76 0 3 55 68 100 R. flavipes 7.6 0 0 2 42 100 76 1 3 38 100 100

table 5

% termite mortality for compositions/baits comprising acetamiprid

termite type Concentration of acetamiprid (ppm) 1 day 2 days 3 days 7 days C. formosanus 13 2 2 2 4 133 2 2 14 100 267 0 2 16 100 533 4 4 10 36 1067 6 14 16 50 R. flavipes 13 0 0 4 80 133 2 6 18 100 267 0 8 twenty two 100 533 10 twenty two 44 66 1067 12 28 58 78

Example 2

Tests demonstrating the selectivity and lethality of compositions/baits comprising liquid termiticides

A 3 gallon plastic container was filled with moist sand and used as the testing ground. FMC termite monitoring stations equipped with SMARTDISC ^TM locators were installed at each site. Inside the station, a toxicity test disc (the same disc used in Example 1 above) was placed at the bottom of the station and an untreated wood monitor was placed on top, thus providing the termites with a choice of food source. Toxicity test discs had been treated with 84 ppm fipronil or 132 ppm acetamiprid. 1000 termites (Reticulitermes flavipes or Coptotermesformosanus) were poured into the sand and allowed to channel in the sand and infeste the monitoring station. Check the monitoring station regularly by removing the cover, removing the wood and inspecting the bottom of the station for any disc consumption or dead termites. Results were recorded during periodic inspections and noted as follows: D = all termite colonies dead, LT = live termites were found at the test site, DT = dead termites were found at the test site. The results are shown in Tables 6 and 7.

Table 6

Termite Mortality of Test Discs Containing 84 ppm Fipronil

termite type test# sky 7 8 10 14 15 19 twenty one twenty two C. formosanus 9 D 11 LTDT LTDT D. 16 LTDT LTDT D. 25 LTDT LTDT D. 27 LTDT LTDT D. control LT LT LT R. flavipes 10 LTDT D. 12 D 15 D 26 LTDT D. 28 D control LT LT LT

Table 7

Termite Mortality of Test Discs Containing 132 ppm Acetamiprid

termite type Test site# sky 5 7 12 14 19 twenty one C. formosanus 17 LTDT LTDT LTDT twenty one LTDT D. twenty three LTDT LTDT D. 29 LTDT D. 31 LTDT LTDT D. control LT LT LT R. flavipes 18 LTDT LTDT LTDT twenty two LTDT D. twenty four LTDT D. 30 D 32 D control LT LT LT

In the present invention, the term "termiticide" refers to an active chemical compound or component that kills or repels termites very quickly (suitable for fast action), such as chlorfenapyr, oxadiazole, fipronil, Synthetic pyrethrins and neonicotinoids. The term "poison" refers to a potent chemical compound or component that slowly kills termites, such as hydrazone, insect growth regulators and chronic-acting poisons such as pathogens. The term "locus" refers to any location where termite control is required or expected to be required. These sites include, but are not limited to, buildings, trees, stake posts, fences, and sites adjacent to buildings, trees, stake posts, fences, and other sites.

Those skilled in the art will appreciate that various changes are possible and that the invention can be carried out in other ways than explicitly described herein. Accordingly, this invention includes all modifications within the spirit and scope of the following claims.

Claims (14)

1. the method for a control termites, described method are included in to be needed or expects to need the place of control termites to place a kind of compositions, and said composition comprises:

(a) derive from the cellulose substances of birch (Betula sp.);

(b) binding agent; With

(c) be selected from fluorine azoles worm Qing ， oxadiazole worm and see sharp strength spy, the termiticide of pyrethroid and anabasine.

2. the method for claim 1, wherein said termiticide are that the fluorine azoles worm that exists of the concentration with 1～600ppm is clear.

3. the method for claim 1, wherein said termiticide is with 1～1, the concentration Cun Zai De oxadiazole worm of 000ppm sees.

4. the method for claim 1, wherein said termiticide is with 1～1, the sharp strength spy that the concentration of 500ppm exists.

5. the method for claim 1, wherein said anabasine is selected from Imidacloprid, and the pyrrole worm is clear, Nithiazine, thiophene worm piperazine, MTI-446, nitenpyram, thiophene worm quinoline and thiophene worm amine.

6. method as claimed in claim 5, wherein said anabasine are that Imidacloprid or pyrrole worm are clear.

7. method as claimed in claim 6, wherein said anabasine is with 1～1, the pyrrole worm that the concentration of 100ppm exists is clear.

8. the method for claim 1, wherein said pyrethroid is selected from bifenthrin, cypermethrin, own body cypermethrin, lambda-cyhalothrin, second body lambda-cyhalothrin, the nail body cypermethrin, tralomethrin, decis, cyfloxylate, second body cyfloxylate, esfenvalerate, taufluvalinate, ether chrysanthemum ester and Permethrin.

9. method as claimed in claim 8, wherein said pyrethroid is selected from bifenthrin, cypermethrin, own body cypermethrin and Permethrin.

10. method as claimed in claim 9, wherein said pyrethroid is a bifenthrin.

11. method as claimed in claim 10, wherein said bifenthrin exists with the concentration of 1～80ppm.

12. the method for claim 1, wherein said binding agent is selected from the angle algin, Terra-ControlSC823 soil stabilizer, polyacrylamide soil stabilizer, microcrystalline Cellulose, Wo Boer sticker, sodium silicate, alginate, agar, glue, dentistry compressed substrate and sclerosing agent.

13. method as claimed in claim 12, wherein said binding agent are iota angle algin or kappa angle algin.

14. method according to claim 1, wherein said place is the place of the building of contiguous Coptotermes formosanus Shtrari. invasion, the place of the building that contiguous expection Coptotermes formosanus Shtrari. is invaded and harassed, the place that Coptotermes formosanus Shtrari. is invaded and harassed, the place that the expection Coptotermes formosanus Shtrari. is invaded and harassed perhaps has the place in active Coptotermes formosanus Shtrari. monitoring point.