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Toxic and behavioural effects of plant extracts to greenhouse whitefly [Trialeurodes vaporariorum (Westw.) (Hemiptera: Aleyrodidae)]
(ENTOMOLOGICAL SOC TURKEY, EGE UNIV, 2014) Karaca, Ibrahim Cagatay; Gotkce, Ayhan
The contact toxicity, repellent and anti-ovipositional effects of 7 plant extracts (Achillea biserrata, Heracleum platytaenium, Humulus lupulus, Hyoscyamus niger, Phlomis pungens, Rhododendron ponticum, Salvia tomentosa) were tested on the greenhouse whitefly (Trialeurodes vaporariorum) under laboratory conditions. Hyoscyamus niger extract produced the greatest contact toxicity among the tested plant extracts with 79% mortality and it was followed by H. lupulus extract with 74% mortality. In the second part of the study, the dose response bioassays with H. niger and H. lupulus were carried out. The calculated LC50 values for 3. stage nymph were 6.65% plant extract /acetone (w/v) and 8.09% plant extract / acetone for respectively. LC50 values of H. niger and H. lupulus for adult stage were 6.64% and 9.49% respectively. Repellent and antiovipoisition effects of 2 plant extracts (H. niger, H. lupulus) were also tested against the grennhouse whitefly. In the behavioral studies, H. lupulus extract was the most active among the tested plant extracts and it totally inhibited T. vaporariorum female egg laying in anti-oviposition study.