Pour des pathologies proches des dommages provoqués par nos ravageurs, on constate l’ indiscutable efficacité de l’Emamectine Benzoate . Reste cependant à parfaire nos connaissances sur sa faculté à se transporter à coup sûr dans le bourgeon apical du palmier.
Abstract The screening of suitable insecticides is a key factor in successfully applying trunk injection technology to ornamental plants. In this study, six chemical pesticides were selected and injected into the trunks of Osmanthus fragrans * to control the nettle caterpillar, Latoia lepida (Lepidoptera : Limacodidae), using a no-pressure injection system. The absorption rate of the insecticides, the leaf loss due to insect damage, and the mortality and frass amount of L. lepida larvae were evaluated after 77 and 429 days. The results showed that 4% imidacloprid + carbosulfan and 21% abamectin + imidacloprid + omethoate had the fastest conductivity and were completely absorbed into the trunkswithin14 days ; however, the efficiencies of these insecticides in controlling L. lepidawere extremely low. Additionally, the treatment 10% emamectin benzoate + clothianidin and 2.5% emamectin benzoate was almost completely absorbed within 30 days and exhibited a longer duration of insecticide efficiency (>80% mortality) in the upper and lower leaves of the canopy. Treatment with these insecticides also resulted in significantly lower leaf loss and frass amounts. We conclude that emamectin benzoate and emamectin benzoate + clothianidin have a rapid uptake into O. fragrans, and are effective as insecticides over long durations. Hence, they may be a suitable control option for L. lepida in O. fragrans plants.
*L’Olivier odorant, osmanthus, encore appelé olivier de Chine ou olivier à thé, est un arbuste à feuillage persistant de 5 à 12 m de haut. La fleur, très réputée en Asie, est notamment utilisée en parfumerie de luxe.
Overall, we conclude that emamectin benzoate (EB) and emamectin benzoate + clothianidin (EB + CL) trunk-injected insecticides were rapidly absorbed into O. fragrans, demonstrated significant insecticide efficacy against L. lepida, and remained effective over a longer duration than the other insecticides. However, the safety of these injection insecticides on the flowers of O. fragrans must be further studied in future research.
L’article complet rendu public par les auteurs : Evaluation of the effectiveness of insecticide trunk injections for control of Latoia lepida (Cramer) in the sweet olive tree Osmanthus fragrans https://peerj.com/articles/2480/