Effects of imidacloprid on Harmonia axyridis (Coleoptera: Coccinellidae) larval biology and locomotory behavior
2000
Vincent, C. (Centre de Recherche et de Developpement en Horticulture, Saint-Jean-sur-Richelieu (Canada)) | Ferran, A. | Guige, L. | Gambier, J. | Brun, J.
The effects of imidacloprid on 1-day-old third instars of Harmonia axyridis were assessed by topical treatment and contact with treated glass plates in laboratory bioassays. When 5 microliters of imidacloprid solutions were applied topically, the LD50 was 0.085 g/L per insect after 24 h. There were significant differences in average weight gain per day (from third instar to prepupa) after treatments with different imidacloprid concentrations. A temporary knockdown effect was observed with higher concentrations and longer durations of contact with treated plates. Compared with untreated third instars, contact with imidacloprid-treated plates caused an increase in time spent on the glass plates resulting from an increase in number of stops and angular speed and a decrease in linear speed excluding stops. The changes in locomotory behaviour lasted up to 24 h after contact with imidacloprid-treated plates.
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