Effect of Three Insect Growth Regulators on The Avian Malaria Vector -Culiseta longiareolata Larvae- Field Population

AbstractSeveral species of mosquitoes (Culicidae) are responsible for transmitting pathogens to animals and humans. The study of these species and the fight against these natural enemies are among the current concerns of scientists. Insect growth regulators (IGRs) are chemicals that disrupt the growth and development of insects. They are often used in pest control strategies to target specific stages in an insect's life cycle, An inventory of Culicidae in the M'chouneche region (34° 56' 59.99" N, 6° 00' 0.00" E) (Biskra, southeastern Algeria) was conducted in various breeding sites between November 2022 and May 2023.Four species of Culicidae were identified (Culiseta longiareolata, Culex pipiens, Culex theileri and Anopheles multicolor). Under experimental conditions, control tests were conducted to evaluate the toxicity of three insects growth regulators (Lufenuron, Teflubenzuron, and Spirotetramat) on the fourth larval stage of Cs. longiareolata. Lufenuron revealed a higher toxic effect with a rate of 57%, ranging from 0 to 100%, compared to Spirotetramat with an average mortality rate of 37.71% with a range of 0 to 80%, and Teflubenzuron showed an average mortality rate of 12.08%, ranging from 0 to 45%. The mortality rates increased from one concentration to another over time, and the correlation coefficient was low 30 % about the two factors (time and concentration) with the mortality rates. Individuals treated after their adult stage showed a significant late in their development. For the concentration of 20 mg/l and 40 mg/l, the delay duration was approximately 2 days ± 12 hours. In contrast, for the third concentration (80 mg/l), the development delay was around 3 days ± 15 hours.Keywords. M'chouneche, Lufenuron, Teflubenzuron, Spirotetramat, Culiseta longiareolata.

Effect of Three Insect Growth Regulators on The Avian Malaria Vector -Culiseta longiareolata Larvae- Field Population Keywords:

M' chouneche , lufenuron , Teflubenzuron , Spirotetramat , Culiseta longiareolata