Smitley D.R.,Michigan State University |
Doccola J.J.,Arborjet Inc. |
Arboriculture and Urban Forestry | Year: 2010
Green ash (Fraxinuspennsylvanica Marsh.) street trees ranging in size from 25 to 45 cm dbh were trunk injected with emamectin benzoate at rates of 0.10-0.60 g ai/2.54 cm dbh at three Michigan, U.S., locations in 2005 or 2006. Tree health was monitored by annual canopy thinning and dieback ratings for up to four years after a single treatment. Branch samples were collected in the autumn and the bark removed to count emerald ash borer larvae for most treatments over the same period of time. A single trunk injection treatment of emamectin benzoate at the 0.1,0.2, or 0.4 g ai rate gave 100% control of emerald ash borer larvae in 98 of 99 treated trees for 2-3 years. Canopy ratings for treated trees remained similar for 2-4 years following trunk injection, while >50% of the control trees died during the same period of time. Ash trees that received a combination of an imidacloprid trunk injection and an imidacloprid basal drench or an annual imidacloprid basal drench had similarcanopy ratings, but more larvae were found in branches from trees receiving the annual basal drench. © 2010 International Society of Arboriculture.
Fettig C.J.,U.S. Department of Agriculture |
Munson A.S.,U.S. Department of Agriculture |
Grosman D.M.,Arborjet Inc. |
Bush P.B.,University of Georgia
Pest Management Science | Year: 2014
BACKGROUND: Protection of conifers from bark beetle colonization typically involves applications of liquid formulations of contact insecticides to the tree bole. An evaluation was made of the efficacy of bole injections of emamectin benzoate alone and combined with the fungicide propiconazole for protecting individual lodgepole pine, Pinus contorta Dougl. ex Loud., from mortality attributed to colonization by mountain pine beetle, Dendroctonus ponderosae Hopkins, and progression of associated blue stain fungi. RESULTS: Injections of emamectin benzoate applied in mid-June did not provide adequate levels of tree protection; however, injections of emamectin benzoate+propiconazole applied at the same time were effective for two field seasons. Injections of emamectin benzoate and emamectin benzoate+propiconazole in mid-September provided tree protection the following field season, but unfortunately efficacy could not be determined during a second field season owing to insufficient levels of tree mortality observed in the untreated control, indicative of low D. ponderosae populations. CONCLUSION: Previous evaluations of emamectin benzoate for protecting P. contorta from mortality attributed to D. ponderosae have failed to demonstrate efficacy, which was later attributed to inadequate distribution of emamectin benzoate following injections applied several weeks before D. ponderosae colonization. The present data indicate that injections of emamectin benzoate applied in late summer or early fall will provide adequate levels of tree protection the following summer, and that, when emamectin benzoate is combined with propiconazole, tree protection is afforded the year that injections are implemented. Published 2013. This article is a U.S. Government work and is in the public domain in the USA. © 2014 Society of Chemical Industry 70 5 May 2014.
Arborjet Inc. | Date: 2015-06-04
Arborjet Inc. | Date: 2014-03-03
botanical insecticide, pesticide, miticide, bacteriacide, acaracide, and fungicide for agricultural and domestic use.
Arborjet Inc. | Date: 2014-02-03
Fertilizers and fertilizer additives for agricultural, commercial, and domestic use.