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Another Option for Insect Control RESEARCH Another option for insect control A single product combining two active ingredients may help superintendents by controlling more than one type of insect pest in a single application. Thomas Eickhoff and Frederick ~ Baxendale, Ph.D. In recent years the development of new classes of insecticides, including insect growth regulators and neonicotinyls, has changed the way superintendents approach insect control on golf courses. Gone are the days of multiple broad-spectrum insecticide applica- tions. Today, most insecticides are designed to target a specific insect or insect complex and are used primarily in a preventive man- ner before an infestation occurs. These insec- ticides, including Arena (clothiandin), Merit (imidacloprid), Mach 2 (halofenozide) and others under development have given super- Figure 1. Newer insecticides, including Arena (clothiandin), Merit (imidacloprid), Mach 2 (halofenozide) and others under development, target specific insects or insect complexes and have given superintendents longer treatment windows and the intendents longer treatment windows and the ability to effectively control subsurface-feeding insects such as billbug larvae (left) and white grubs (right). ability to effectively control subsurface-feed- ing insects such as white grubs and billbugs Allectus, a product that is a combination kilograms/hectare) for granular formulations (Figure 1). However, many of these active of two previously registered active ingredi- and 1.1 to 4.5 pints/acre (1.3-5.3 liters/hect- ingredients are not broad-spectrum and are ents, imidacloprid and bifenthrin, has been are) for Allectus GC SC formulations. As less effective for controlling surface-feeding approved for insect control on commercial with any insecticide, instructions, restric- insects. and residential lawns, parks, athletic fields, tions, guidelines and precautions found on Synthetic pyrethroids, including Tempo golf courses and sod farms. The insecticide is the label should be followed for optimal pest Ultra (beta-cyfluthrin), T alstar (bifenthrin), available in granule and soluble concentrflte control. These include: Tempo (cyfluthrin), DeltaGard (deltame- formulations. According to the product label, • For optimal control of subsurface feeders thrin), Scimitar (lambda-cyhalothrin), Astro some of the insect pests controlled are annual (billbug larvae, annual bluegrass weevils (permethrin) and others, provide an effective bluegrass weevils, ants, billbugs, chinch bugs, . and white grubs), Allectus should be applied option for controlling surface-feeding insects cutworms, Japanese beetle adults, sod web- . before egg hatch of the target pest, followed such as chinch bugs, bill bug adults, cut- worms and white grubs. , by sufficient irrigation or rainfall to move worms and sod webworms, but are typically . the active ingredient through the thatch. less effective against subsurface feeders. Most Product use • Applications for control of surface-feeding of these pyrethroids lack the residual activity Allectus application rate~ on turf range . pests can be made when infestations meet to control pests over the long term. from 50 to 125 pounds/acre (56.0-140.1 or exceed economic levels as determined 104 GeM April 2006 RESEARCH by scouting and/or recommendations of products allows superintendents to capitalize local Extension personnel or other quali- on the strengths of two different active ingre- fied specialists, or when anticipated based dients in a one-shot treatment that addresses on site records. multiple insect problems. For instance, a • Applications should not be made when promising combination of active ingredi- turfgrass areas are saturated with water ents could include a synthetic pyrethroid because adequate distribution of the active for controlling surface-feeding insects and a ingredient cannot be achieved under these neonicotinyl for control of subsurface feed- conditions. ers. Research conducted at the University of • Avoid applications to highly compacted or Nebraska compared active ingredient combi- steep sloping areas where rainfall or irriga- nations with individually applied products for tion will be unable to penetrate vertically efficacy against the western chinch bug, Blis- in the soil profile. sus occiduus, in buffalograss (Buchloe dactyloi- • The total amount of product applied must des) and southern masked chafer, Cyclocephala Figure 2. Trials at the University of Nebraska-Lincoln not exceed 9.0 pints or 250 pounds/acre/ lurida, in Kentucky bluegrass (Poa pratensis). have shown that Talstar with the single active ingredient year (10.5 liters or 280.2 kilograms/hect- bifenthrin, and Allectus, a combination product containing Our studies were conducted as random- are/year). bifenthrin and imidacloprid, are equally effective in control- ized complete block designs with four to five • Do not apply through irrigation systems. ling chinch bugs in buffalograss. • Not for use in nurseries, commercial greenhouses or on grasses grown for seed. CHINCH BUG CONTROL, 2004 • Do not apply by air. Treatments Rate Chinch bug control 2004 • Following application, avoid mowing Common Pounds!1,OOO Kilograms! Chinch bugs! % control the turfgrass area until irrigation or rain Trade name name square feet hectare square foot* 10 DAft has washed the insecticide from the grass Bifenthrin + blades. Allectus GC 2.8 136.7 0.4 a 99 Imidapcloprid • When using the SC formulation for sur- face-feeding insects such as armyworms, Merit 0.5 G Imidacloprid 1.38 67.4 11.0 b 71 chinch bugs, cutworms and sod web- Talstar EZ GC Bifenthrin 2.3 112.3 0.0 a 100 worms, irrigation should be delayed for 24 Untreated - - - 38.0 c - hours after application. Note. Chinch bug life stage at application: 20% first instar, 40% second instar, 20% third instar, 20% fourth instar. *Values in the same column followed by different letters are significantly different from each other. Current research tOAT,day(s) after treatment. The development of pesticides that con- Table 1. Control of chinch bug in buffalograss with turfgrass insecticides near Mead, Neb., 2004. tain combinations of previously registered RESIDUAL CONTROL, 2005 Treatments Rate Chinch bug control 2005 Product!1 ,000 Product! Chinch bugs! % control Chinch bugs! % control Trade name Common name square feet hectare square foot* 1 DAft square foot* 63 DAft Allectus GC Bifenthrin + 2.8 pounds 136.7 kilograms 0.25 a 99 0.0 a 100 imidapcloprid Allectus GC Bifenthrin + 2.3 pounds 112.3 kilograms 1.0 a 95 0.0 a 100 imidapcloprid Merit 0.5 G Imidacloprid 1.4 pounds 8.25 b 55 5.5 b 57 Merit 2 F Imidacloprid 0.46 fluid ounce 1.5 liters 8.25 b 55 4.25 b 67 Talstar EZ GC Bifenthrin 2.3 pounds 112.3 kilograms 0.75 a 96 0.5 a 96 Talstar GC F Bifenthrin 0.88 ounce 2.8 liters 0.75 a' 96 0.0 a 100 Untreated - - - 18.5 c - 12.8 c - Note. Chinch bug life stage at application: 50% egg hatch. *Values in the same column followed by different letters are significantly different from each other. tOAl, day(s) after treatment. Table 2. Residual control of chinch bug in buffalograss near Mead, Neb., 2005. April 2006 GeM 105 RESEARCH replications. The plot size was 5 feet x 5 feet (1.5 meters x 1.5 meters) on either buffalo- grass (chinch bug) or Kentucky bluegrass (southern masked chafer). Plots were evalu- ~ Two existing active ingredients, bifenthrin and imidacloprid, have been combined into a single ated by counting the number of surviving product designed to control both surface-feeding and subsurface-feeding insects on turf. insects in a treated plot and comparing this ~ Research at the University of Nebraska has shown that the.new product, Allectus, is just as number to those present in untreated plots. effective as bifenthrin in controlling chinch bug in buffalograss. One year of data suggest that Granular products were applied with a hand Allectus may be as effective as imidacloprid in controlling southern masked chafer in Kentucky bluegrass, but these data should be considered preliminary. shaker; liquid products were applied using a ~ A combination product may save time, labor and money if it means that superintendents need CO backpack sprayer. 2 to apply only one product rather than two or more. Chinch bugs Both Talstar EZ GC (bifenthrin) and Allectus GC provided excellent control of western chinch bug (Table 1). In 2004, both southern masked chafer grubs in Kentucky controlled in turfgrass areas, so, too, may com- Talstar EZ GC and Allectus GC had reduced bluegrass. Our data suggest that Allectus GC binations of herbicides be useful for superin- chinch bug numbers by 99%-100% at 10 acts very much like Merit alone on southern tendents who routinely encounter combina- days after treatment. In 2005, both Talstar masked chafer and therefore should provide tions of subsurface and surface feeders. (EZ GC and GC F) alone and Allectus GC acceptable control. However, with only one A combination product containing both provided quick knockdown of chinch bugs year of data for Allecrus GC on southern bifenthrin and imidacloprid could be used (~95010 control) one day after treatment and masked chafer, further research is needed to to provide immediate control of the surface- provided excellent residual control (~96010 at confirm these results. In research conducted feeding sod webworms or chinch bugs, for 63 days after treatment) as well (Table 2, Fig- at other universities, Allectus GC also pro- example, and still provide the residual activ- ure 2). Neither Merit 0.5 G nor Merit 2 F vided white grub control when applied as a ity needed
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