Impact of four turf management regimes on arthropod abundance in lawns.
BACKGROUND
Turfgrass management practices, especially the use of chemical pesticides, may be detrimental to beneficial arthropods such as predators and decomposers. However, little is known about the impact of other practices or pest control products on these beneficials. The impact of four different management regimes, consisting of synthetic pesticide cover sprays or combinations of more targeted applications of natural pesticides, on selected groups of non-targeted arthropods in lawns of different age was studied over 3 years. The short-term effect of diazinon and carbaryl on Carabidae and Collembola was also evaluated.


RESULTS
Formicidae and Araneae were the most abundant taxa at both sites, representing 74-80% of total captures. With a few short-term exceptions, no persistent and significant difference between turfgrass management regimes on arthropod abundance was observed over the 3 year study. Diazinon and carbaryl significantly reduced Carabidae abundance, but only one year out of three, while Collembola abundance was only transiently affected by carbaryl application in 2003.


CONCLUSIONS
The study showed that practices and products used in the four management regimes did not disrupt the populations of specific groups of arthropods. These results provide useful information to professionals for the development of ecological turf practices to maintain beneficial arthropod abundance and diversity in urban landscapes.
Centre de Recherche en Horticulture, Université Laval, Québec, Québec, Canada. sophie.rochefort@ccapcable.com
Sophie
S
Rochefort
David J
DJ
Shetlar
Jacques
J
Brodeur
D000818:Animals; D044822:Biodiversity; D012721:Carbaryl / Q000009:adverse effects; D003976:Diazinon / Q000009:adverse effects; D006540:Herbicides / Q000009:adverse effects; D007313:Insecta / Q000502:physiology*; D007306:Insecticides / Q000009:adverse effects*; D019684:Magnoliopsida; D010571:Pest Control / Q000379:methods*; D031785:Poa; D011156:Population Density; D011792:Quebec; D012621:Seasons; D012987:Soil; D013112:Spiders / Q000502:physiology*
D006540:Herbicides; D007306:Insecticides; D012987:Soil; D012721:Carbaryl; D003976:Diazinon