Efficacy of essential oil of Piper aduncum against nymphs and adults of Diaphorina citri.
BACKGROUND
Insecticide application is the main way to control Diaphorina citri. However, it causes environmental contamination, has a negative impact on beneficial organisms and leads to psyllid resistance. The essential oil of Piper aduncum has low toxicity towards the environment and contains dillapiol, which has proven to be effective against several crop pests. Here, we studied its efficacy against nymphs and adults of D. citri under laboratory conditions. Oils with three concentrations of dillapiol (69.3, 79.9 and 85.4%) at 0.5, 0.75 and 1.0% dilutions plus 0.025% adjuvant were tested.


RESULTS
All treatments caused 90-100% mortality in nymphs. Topical treatments with oil containing 79.9 and 85.4% dillapiol at 0.75% and 1% dilutions were effective (mortality ≥80%) in adults. However, the essential oil showed no residual activity against adults (mortality ≤30%).


CONCLUSIONS
Dillapiol-rich oil is a promising compound for D. citri control. © 2015 Society of Chemical Industry.
Fundo de Defesa da Citricultura, Araraquara, Sao Paulo, Brazil.
Haroldo Xl
HX
Volpe
Embrapa Acre, Rio Branco, Acre, Brazil.
Murilo
M
Fazolin
Fundo de Defesa da Citricultura, Araraquara, Sao Paulo, Brazil.
Rafael B
RB
Garcia
Fundo de Defesa da Citricultura, Araraquara, Sao Paulo, Brazil.|Chemistry Department, Federal University of São Carlos, São Carlos, Sao Paulo, Brazil.
Rodrigo F
RF
Magnani
Department of Exact Sciences, Faculty of Agricultural and Veterinary Sciences of Jaboticabal - FCAV/Unesp, Jaboticabal, Sao Paulo, Brazil.
José Carlos
JC
Barbosa
Fundo de Defesa da Citricultura, Araraquara, Sao Paulo, Brazil.
Marcelo P
MP
Miranda
D000818:Animals; D006430:Hemiptera / Q000187:drug effects*; D007300:Insect Control / Q000379:methods; D007306:Insecticides / Q000494:pharmacology*; D009758:Nymph / Q000187:drug effects; D009822:Oils, Volatile / Q000302:isolation & purification / Q000494:pharmacology*; D031701:Piper / Q000737:chemistry; D010938:Plant Oils / Q000302:isolation & purification / Q000494:pharmacology*
D007306:Insecticides; D009822:Oils, Volatile; D010938:Plant Oils
Asian citrus psyllid; HLB; active ingredient rotation; botanical insecticide; integrated pest management