title: Agricultural management systems affect the green lacewing community (Neuroptera: Chrysopidae) in olive orchards in southern Spain.
abstract: Green lacewings are generalist predators whose conservation is important for pest control in olive orchards (Olea europaea L.) Sustainable farming practices, as opposed to conventional management techniques, are believed to foster the presence of natural enemies. This study therefore  aims to analyze the effect of 1) herbicidal weed cover removal and insecticide applications, and 2) the general management systems used in the olive orchards of southern Spain on chrysopid assemblages and abundance. Green lacewing adults and larvae were collected from olive orchards under  conventional, integrated, and organic management systems. In addition, chemical analyses of residues were carried out to determine the presence of insecticidal and herbicidal residues. Eight adult species and three genera of larvae were identified. No rare species were captured from the most  intensively farmed orchard, which therefore recorded the most limited chrysopid diversity with a very marked dominance of Chrysoperla carnea s.l.. No effect of dimethoate treatments on Chrysoperla larvae or C. carnea s.l. adults was observed. However, the presence of insecticide  residues was associated with the depletion of Dichochrysa larvae. The absence of herbicide treatments favored C. carnea s.l. adult presence on olive trees while larval abundance decreased. Dichochrysa larvae were more abundant when weed cover received no treatment. In  relation to the management systems studied, no difference in Chrysoperla larval abundance was observed between conventional and organic orchards. However, Dichochrysa larvae were more abundant in orchards under organic management.
authors: Department of Environmental Protection, Estación Experimental de Zaidín, CSIC, Profesor Albareda n° 1, 18008 Granada, Spain.
authors: M
authors: M
authors: Porcel
authors: F
authors: F
authors: Ruano
authors: B
authors: B
authors: Cotes
authors: A
authors: A
authors: Peña
authors: M
authors: M
authors: Campos
mesh_terms: D000818:Animals; D044822:Biodiversity; D003247:Conservation of Natural Resources; D006540:Herbicides; D007313:Insecta; D007306:Insecticides; D031658:Olea; D010573:Pesticide Residues / Q000032:analysis; D011157:Population Dynamics; D013030:Spain
chemical_list: D006540:Herbicides; D007306:Insecticides; D010573:Pesticide Residues