Impact of biolarviciding on Simulium ornatum Meigen 1818 (Compex) populations and related biting risk
2006
Petric, D.(Faculty of Agriculture, Novi Sad (Serbia). Laboratory of Medicinal and Veterinary Entomology) | Zgomba, M.(Faculty of Agriculture, Novi Sad (Serbia). Laboratory of Medicinal and Veterinary Entomology) | Ignjatovic-Cupina, A.(Faculty of Agriculture, Novi Sad (Serbia). Laboratory of Medicinal and Veterinary Entomology) | Konjevic, A.(Faculty of Agriculture, Novi Sad (Serbia). Laboratory of Medicinal and Veterinary Entomology) | Marinkovic, D.(Faculty of Agriculture, Novi Sad (Serbia). Laboratory of Medicinal and Veterinary Entomology) | Markovic, I.(Ciklonizacija DOO, Novi Sad (Serbia))
Recent studies of blackflies in the region of Novi Sad, Serbia, conformed the dominance of Simulium ornatum in small watercourses. Routine treatments of the simuliids breeding sites with biologicals (B.t.i.) were conducted for the first time in the region in 2005. Since then, the treatments have been performed on a regular basis following monitoring of larval abundance. The timing of the treatments was chosen carefully for each watercourse in accordance with density and age composition of the populations. It has been demostrated that the optimal moment for larvicide application is the onset of the pupal stage. Application rates and duration of the treatments were calculated and defined depending on the flow velocity and water temperature established for each stream. The product dosage and duration of application ranged within the intervals of 5 to 25 ppm and 10-20 min, respectively. The registered carry of the B.t.i. was 500 m downstream. Systematically performed larvicide treatments affected the number of adult specimens subsequently captured in traps. In the given circumstances, four larvicide treatments during the spring and summer were sufficient to keep the adult population level low. When the overwintering generation was suppressed by an autumn treatment, two or three spring/summer larvicide treatments were sufficient to maintain the adult population density constantly under the nuisance threshold.
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