6Pimentel D. Habitat factors in new pestinvasions [C].In:im,K,, McPheron,.A.(d s.)Evolution of Insect Pests-Patterns of Va riation. New York:Wiley,993.
7Pimentel D.,NeNair S.,Janecka J.,et al.Economic and environmental threats of alienplant,animal,nd microbe invasions[J].Agriculture,Ecosystem & Environment,001,4()1-20.
8Anonymous.The green way to a green yard[J].Con- sumer Reports,991,6()407-424.
9Logan W B. Turn garden waste into garden gold [J].Or ganic Garden,991,8()46-48.
10Sachs P. Healthy grass,safe lawn[J]. Organic Gardening,999,6()46-51.