Insecticidal action of Drimys brasiliensis Miers on black citrus aphid

Simoni Anese, Wanessa Porto Tito Gambarra, Patrícia Umeda Grisi, Sonia Cristina Juliano Gualtieri


The aim of this study was to evaluate the insecticidal effects of a hexane fraction and polygodial compound obtained from Drimys brasiliensis roots on the mortality of adults and nymphs of Toxoptera citricida (black citrus aphid). For the hexane fraction, solutions of 0.12, 0.25, 0.50, 1.0, and 2.0 mg mL-1 were prepared, and for the compound, solutions of 62.5, 125, 250, and 500 µg mL-1 were prepared. A control with water and dimethylsulfoxide (5 µg mL-1) was also included. Two hexane-fraction-solution application methods were evaluated: spraying directly onto the insect, and submerging a young Citrus limonia shoots in the solution, which served as a refuge for the aphids. Nymph and adult mortality were assessed at 24 and 48 h after solution application. The hexane fraction caused high mortality amongst the T. citricida nymphs and adults. The lowest LC50 value (0.301 mg mL) was recorded in the nymphs when the solutions were applied directly onto the insects. The polygodial compound that was isolated from the hexane fraction significantly increased the mortality of adults and nymphs, with LC50 values of 293.8 and 176.77 µg mL-1, respectively. The insecticidal activity observed may have been caused by this compound.


Casca d’anta; Botanical insecticide; Insect mortality; Polygodial compound

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