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P-IE

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Category: Poster

Poster: P-IE, IPM - Field Crops and Horticulture

Bioactivity of essential oils to control Bemisia tabaci MED (Hemiptera: Aleyrodidae) on tomato

Poster
The whitefly, Bemisia tabaci MED (biotype Q) (Hemiptera: Aleyrodidae), is one of the most severe tomato pests worldwide. The direct and indirect damage caused by this insect in tomato plants can drastically reduce agricultural production. In Brazil, its control is enforced by using synthetic insecticides available for B. tabaci MEAM1 (biotype B), which usually demonstrate inefficient results due to the lower susceptibility of this species. Thus, alternative methods such as the use of botanical pesticides can be a promising strategy for MED species management. In this study, we investigated the composition and bioactivity of the essential oils of Pelargonium graveolens L'Her. (Geraniaceae), Eugenia uniflora L. (Myrtaceae) and Piper callosum Ruiz & Pav. (Piperaceae) against B. tabaci MED nymphs in tomato. The major chemical constituents of P. callosum were identified as safrole (38.63%), α-pinene (17.77%) and β-pinene (12.56%), whereas citronelol (32.94%), geraniol (17.74%) were the major compounds identified in P. graveolens. The sesquiterpenes curzerene (53.85%) and germacrone (10.68%) were the main compounds in the essential oil of E. uniflora. The essential oil of P. graveolens had the lowest LC50 (3.532 µl/mL), followed by E. uniflora (5.601 µl/mL) and P. callosum (8.362 µl /mL). Based on the toxicity rate, the essential oil of P. graveolens was 2.37 times more toxic than the oil of P. callosum. Our results demonstrated that all essential oils assessed showed potential for B. tabaci MED control in tomato.