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[The inheritance of irritability to insecticides in malarial mosquitoes]
Abstract:
Mosquito populations are not uniform in irritability to insecticides. Due to this reason presentation of the test results as an average number of one mosquito's flights during 10 or 15 minutes contact with insecticide paper does not reflect infrapopulation differences. It is proposed to divide mosquitoes into 3 groups: not irritable (0-1 flight per 10 minutes of contact), moderately irritable (2-9 flights), and highly irritable (10 and more). For the irritability tests only mosquitoes with 0-1 flight (during contact with control paper) were taken. Spontaneously irritable mosquitoes (2 and more flights in control) may become the reason of erroneous results. Yearly and seasonal changes of irritability level in different Anopheles species depending on the insecticide spraying intensity are shown. First proof of the inherited irritability to insecticides and specificity of this quality is obtained. Indirect data indicate that probably polygenic inheritance of irritability takes place in Anopheles.
Insights
Mosquitoes exhibit varying irritability to insecticides, necessitating a new classification system. This research reveals inherited and specific irritability traits in Anopheles mosquitoes, suggesting polygenic inheritance.
Area of Science:
- Entomology
- Insecticide Resistance Studies
Background:
- Mosquito populations display non-uniform irritability to insecticides.
- Average flight counts fail to capture infrapopulation differences in insecticide response.
Purpose of the Study:
- To propose a refined method for assessing mosquito irritability to insecticides.
- To investigate yearly and seasonal variations in Anopheles irritability.
- To provide evidence for inherited and specific irritability traits in mosquitoes.
Main Methods:
- Development of a classification system for mosquito irritability (not irritable, moderately irritable, highly irritable) based on flight counts.
- Exclusion of spontaneously irritable mosquitoes from testing.
- Observation of Anopheles species' irritability levels over time and in relation to insecticide spraying intensity.
Main Results:
- A new classification system categorizes mosquito irritability into three distinct groups.
- Yearly and seasonal fluctuations in Anopheles irritability were documented, correlating with insecticide use.
- The study presents the first evidence of inherited and specific insecticide irritability in mosquitoes.
Conclusions:
- The proposed irritability classification provides a more accurate assessment of mosquito populations.
- Insecticide irritability in Anopheles is an inherited trait, likely polygenic.
- Understanding inherited irritability is crucial for effective insecticide resistance management strategies.