Composition and biological activity of essential oils against Metopolophium dirhodum (Hemiptera: Aphididae) cereal crop pest.
BACKGROUND
Natural pesticides based on plant essential oils may represent alternative crop protectants. This study analysed the chemical constituents and bioactivities of essential oils from Schinus areira L., Rosmarinus officinalis L. and Tagetes terniflora Kunth against winged and wingless adults of Metopolophium dirhodum (Walk.).


RESULTS
The major component of S. areira was α-phellandrene, that of R. officinalis was 1,8-cineole and that of T. terniflora was cis-ocimene. Rosemary essential oil was more effective than the others in immersion method tests. In contact toxicity, the rosemary oil was the most toxic to wingless adults and the S. areira leaf oil was the most toxic to winged adults. All the EOs produced some degrees of repellency in adults and effects on the reproduction and demographic parameters.


CONCLUSIONS
These results showed that the essential oils from S. areira, R. officinalis and T. terniflora could be used as an alternative in the management of M. dirhodum.
Laboratorio de Zoología Agrícola, Dpto de Agronomía, Universidad Nacional del Sur, Bahía Blanca, Argentina. cschopa@uns.edu.ar
Carolina Sánchez
CS
Chopa
Lilian R
LR
Descamps
D000818:Animals; D001042:Aphids / Q000254:growth & development / Q000502:physiology; D001681:Biological Assay; D018556:Crops, Agricultural; D002523:Edible Grain; D005260:Female; D007306:Insecticides / Q000737:chemistry*; D019684:Magnoliopsida / Q000737:chemistry; D009758:Nymph / Q000187:drug effects / Q000254:growth & development; D009822:Oils, Volatile / Q000737:chemistry*; D012098:Reproduction / Q000187:drug effects
D007306:Insecticides; D009822:Oils, Volatile