|
Document Type |
: |
Thesis |
|
Document Title |
: |
STUDY OF THE SEASONAL FLUCTUATION OF MOSQUITOES POPULATION WITH EVALUATION OF THE EFFECTIVENESS OF THE INSECTICIDES USED AGAINST THE DOMINANT SPECIES IN BALJURASHI PROVINCE دراسة التذبذب الموسمي لمجتمعات البعوض مع تقييم فعالية المبيدات المستخدمة ضد النوع السائد بمحافظة بلجرشي |
|
Subject |
: |
Faculty of Sciences |
|
Document Language |
: |
Arabic |
|
Abstract |
: |
This study aimed to conduct a comprehensive survey of mosquitoes in Baljurashi Province and to investigate the effects of climate conditions on density and activity of mosquitoes. It also aimed to evaluate some of the used insecticides to select the most efficient in control processes. Due to scarcity of environmental and laboratory studies in Baljurashi, this study could help to determine the mosquitoes of medical importance that threaten people and rationalize insecticide usage which protect environment from pollution. This study was conducted within 2015- 2016 and around 12634 of male and female were collected by using Black-Hole traps. Thirty species of adult were identified and five species were recorded in Saudi Arabia for the first time. All species belong to the following genera: Culex, Aedes, Anopheles, Culiseta and Lutzia. The most abundant genus was Culex (98.6%) and the Cx. pipiens was a dominate species. Adult mosquitoes were available over the year and a peak of density and activity was observed during the summer season (x̅=30°C) which confirm that the temperature play a key role in mosquitoes existence and distribution. Statistic results showed significant relationship between mosquito population and temperature (r =0.594). The results showed significant differences between the ten locations of study and it was found that some locations characteristics led to mosquitoes attraction. The highest number of mosquitoes was recorded in Dar Al Souq ((x̅=97.6) per a week whereas Balathma location was the lowest one. Furthermore breeding sites were determined and all coordinates labeled on Baljurashi map using GIS technique. The most important breeding sites were dams water, roads bridges and rainwater drainages places. In laboratory studies, the dominant species was identified at the molecular level using PCR technique and the results showed that the Cx. pipiens cf-3 strain was the accurate definition. In terms of insecticides evaluation, the results illustrate that exposing adults to Rezithion, Sweeper (Organophosphates) and AlphaKill, Demand (Pyrethrods) for 24 hr caused mortality of 98%, 89%, 93.4% and 62.2% respectively. This means that mosquitoes are more sensitive to Rezithion whereas tolerant or resistant to others. Besides, the concentration required to kill 50% (LC50) of larvae was 1.23 and 2.03 ppm when they were treated with Rezithion and Sweeper respectively which indicate that the Rezithion is more effective against Cx. pipiens by about 1.23 fold. Additionally, the use of Diflox flowable and MosKill (Insect growth regulator, IGRs) against Cx. pipiens lead to mortality between 91-98% including morphological deformities for all growth stages and adult inhibition. Finally, this study suggests conducting more survey for all provinces in Al Baha region to establish a database on the spread of mosquitoes and recommends using IGRs as they are low in toxicity to humans and an eco-friendly method |
|
Supervisor |
: |
Prof. Khalid M. Alghamdi |
|
Thesis Type |
: |
Doctorate Thesis |
|
Publishing Year |
: |
1439 AH
2018 AD |
|
Co-Supervisor |
: |
Dr. Jazem A. Mahyoub |
|
Added Date |
: |
Monday, April 9, 2018 |
|
Researchers
| طارق سعيد الغامدي | Alghamdi, Tariq Saeed | Researcher | Doctorate | |
|