| Autor: |
Joe Meating, B. V. Helson, Dean G. Thompson, Susana Grimalt, John W. McFarlane, Derek Chartrand, Taylor Scarr, Barry Lyons |
| Rok vydání: |
2011 |
| Předmět: |
|
| Zdroj: |
Pest Management Science. 67:1277-1284 |
| ISSN: |
1526-498X |
| DOI: |
10.1002/ps.2183 |
| Popis: |
BACKGROUND: Azadirachtins are natural insecticides derived from the neem tree. The emerald ash borer (EAB) is an exotic invasiveinsectpestthatinfestsvariousashtreespeciesandhasthepotentialforsignificanteconomic,aestheticandecological impacts throughout North America. The initial translocation and foliar residue dynamics of azadirachtins were examined following direct injection into white and green ash trees growing in urban scenarios as a potential control for EAB. RESULTS:SubstantialconcentrationsofazadirachtinsAandB[meanmaxima >0.98 mg kg −1 freshweight(f.w.)]wereobserved within 2 days of injecting a specifically designed formulation of azadirachtins. Foliar residues declined exponentially through time, with half-life estimates ranging from 5.1 to 12.3 days. At the time of leaf senescence, foliar residue levels approximated 0.01 mg kg −1 f.w., strongly mitigating the potential effects ofnon-target biota in soil or aquatic compartments. CONCLUSION:Themagnitudeanddurationofexposuresobservedinthisfieldstudywereconsideredtobeabovethethresholds required for biological effectiveness against both larval and adult life stages of EAB. Results support the use of azadirachtins as an environmentally acceptable systemic insecticide for control of EAB and protection of high-value ash trees in urban environments. c � 2011 Society of Chemical Industry |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
|
Plný text