Naslov
Influence of molting on efficacy of two funcionally different larvicides : Bti and Temephos

Autori
Jarić-Perkušić, Davorka ; Hackenberger Kutuzović, Branimir ; Stepić, Sandra ; Merdić, Enrih

Izvornik
Journal of economic entomology (0022-0493) 101 (2008), 4; 1204-1210

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Culex; Ochlerotatus; insecticide; mosquito; instar

Sažetak
The sensitivity of the second, third (L3), and fourth (L4) instars of Culex pipiens L. and Ochlerotatus sticticus (Meigen) to two larvicides, temephos and Bacillus thuringiensis variety israelensis (Bti) was tested with and without molting occurring in the experiments. In the Þ rst experiment for both tested mosquito species, LC50 values increased from the second to the fourth instar when tested against temephos, whereas for Bti the opposite trend was observed. The highest LC50 value was found for fourth instars of Cx. pipens (0.00405 mg/liter) against temephos and for second instars of Oc. sticticus (0.267 mg/liter) against Bti. The determined LC50 values for the second and third instars of both species decreased with an increased number of molted larvae in the experiments with temephos. For the experiments with Bti molting did not have any signiÞ cant inßuence on LC50 values, except a small increase in toxicity during the L3/L4 molt of Oc. sticticus. These Þ ndings could help assess and deÞ ne larviciding, as well as inßuence the quantity of larvicides needed for an efÞ cient treatment.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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