Mortality of nontarget arthropods from an aerial application of pyrethrins.
Mortality of nontarget organisms from an ultra-low volume (ULV) aerial application of pyrethrins (Evergreen EC 60-6) was monitored by collecting arthropods from ground tarps placed at the interface of open and canopy areas. A larger number and greater diversity of arthropods were recovered from tarps in the ULV spray area. The observed mortality was approximately 10-fold greater than in the control area. Kruskal-Wallis tests revealed a significant difference in the abundance and diversity of arthropods collected at treatment and control sites at 1 and 12 h postspray. Arthropods, primarily insects, from the treatment area included representatives from 12 orders and > or = 34 families, as compared to 7 orders and 12 families in the control area. Chironomidae (midges) and Formicidae (ants) were the most commonly represented families, accounting for 61% of the arthropods collected from the treatment area; no large-bodied insects (>8 mm) were recovered. Mortality of sentinel mosquitoes in the treatment and control areas averaged 96% and <1%, respectively, at 24 h postexposure. This study supports previous work that the impact of a single ULV application of pyrethrins was limited to a variety of small-bodied arthropods.
Kwan
Jonathan A
JA
Vector-Borne Disease Section, Infectious Diseases Branch, Division of Communicable Disease Control, Center for Infectious Diseases, California Department of Public Health, 1616 Capitol Avenue, MS 7307, PO Box 997377, Sacramento, CA, 95899-7307, USA.
Novak
Mark G
MG
Hyles
Timothy S
TS
Niemela
Michael K
MK
D000818:Animals; D001181:Arthropods / Q000033:anatomy & histology / Q000187:drug effects*; D009033:Culicidae; D007306:Insecticides / Q000633:toxicity*; D009032:Mosquito Control / Q000379:methods*; D011722:Pyrethrins / Q000633:toxicity*
D007306:Insecticides; D011722:Pyrethrins