The present study includes the effect of the ethanolic and aqueous extract of Piper nigrum against the third instar of Culex pipiens molestus (Diptera:Culicidae) in different concentrations: 1, 1.5 ppm of ethanolic extracts of Piper nigrum causing 100% mortality of larvae in the second day of treatment, while the concentrations 5% of aqueous extracts of Piper nigrum caused 100% mortality of larvae in the second day of treatment. The concentration 2.5% caused 100% mortality of larvae after four days of treatment. The current study also detected the effect of 0.1% concentration of Piper nigrum aqueous extract. The effect of this concentration has been studied on the growth of the ovaries and their follicles along a period 96 hours after emergence of adult life. The results of this study has clearly shown that the concentration 0.1% of Piper nigrum aqueous extract gave a highly significant inhibitory effect on the growth development of the ovaries and their follicles.

The chemicals materials were used to study the effect of citric acid, detergents, sodium carbonate, sodium bicarbonate on the vitality of the third stage of mosquito Culex pipiens molestus. The highest larvicidal efficacy was established from citric acid solution followed by detergents solution, sodium carbonate, sodium bicarbonate with (LC 50 ) values 2096, 2715, 13930, 13960 ppm respectively. The concentration of 1000 ppm of citric acid showed a fatal effect on the third stage larvae of mosquitoes which gave a mortality percent of 100% on the second day of the treatment. It was followed by the concentrations of 750 ppm and 500 ppm respectively which caused the death of all larvae on the fifth and sixth days respectively. On the other hand, the concentration of 1500 ppm for the detergents killed 100% of the larvae on the third day of treatment. Then, it was followed by the concentration of 1000 ppm, leading to the destruction of all the larvae on the fifth day of the exposure. As for the use of sodium carbonate, the mortality percentage reached to 100% at a concentration of 8000 ppm on the third day of treatment followed by the concentration of 6000 ppm, which led to a 100% killing rate on the sixth day of treatment. While the less impact of studied chemicals was sodium bicarbonate, the 8000 ppm concentration of which caused 84.21% mortality rate of larvae on the fourth day of treatment.

The current study of head lice Pediculus humanus capiti, was conducted in 11 primary schools for girls in different social and economic areas of the city of Mosul on its right and left sides for the period from 15 October 2018 to 15 February 2019. The present study showed that the total incidence of head lice in the 5 schools covered by the right city was 27.44% while the total injury rate in the 6 schools covered by the left city side was 11.13%, the highest percentage of girls with long hair was recorded in the first Zubaidah school on the left side and reached 75% , and Al-Bashair school in the right side where it reached 83.33%, while the highest percentage of girls with short hair in the school of Genin in the left side at 75% and on the right side Al-Sajideen and Al-Shaheed Salem schools as the proportion with short hair in which 33.5 and 33.33% respectively. As for the educational level of mothers of infected girls, the highest rate of infection for mothers of non-educated mothers in the school of Al-Jahafil on the left side of the city, reaching 100%, while the school Al-Bashair recorded 96% on the right side of the city. In addition, the percentage of casualties according to the number of family members was the highest rate of injury to families with fewer than 5 members of the school in Al-Foratain school on the left side of the city with 65%, while the highest rate of infection was recorded for families with more than 5 members in Al-Khalidya school, at 85.07%. As for the schools on the right side of the city, the highest percentage of families with fewer than 5 members in AL-Bashair school was 28%, while the highest percentage was recorded for families with more than 5 members in Al-Sajideen school has reached the percentage of 83% .

The principal aim of the study was to detect the effect of sublethal concentrations of 4 alcoholic plant extracts in addition to an insecticide known as nomolt on the growth and developmnt of ovaries and their follicles in females of the house fly, Musca domestica L. obtained from the treatment of the second larval instars with these extracts . The plant extracts included the leaves extract of Prosopi farcta, Datura stramoniun and Capparis spinosa, in concentrations 10,20,30 ppm and the fruit extract of Melia azedarach in concentrations 1,2,3 ppm, however the concentrations of nomolt were 0.025, 0.05 and 0.1ppm. The effect of these concentrations has being studied on the length and width of the ovaries and their primary follicles along a period including four stages of the adult life.24, 48, 72, 96 hours after emergence. The results of this study have clearly shown that some of the concentrations of the alcoholic plant extracts and of nomolt have had a highly significant inhibitory effect on the growth and development of the ovaries and their follicles. They have sometimes shown a complete growth and / or vitellogenic inhibitory effect, or have interrupted the process of vitellogenesis, or have decreased the numbers of ovarioles, or have caused their and degradation disintegration and follicle degeneration.

The effect of ethanolic, acetonic, methanolic, and aqueous extracts of propolis against 3rd instar larvae of Culex pipiens molestus Forskal (Diptera:Culicidae) in various concentrations was investigated in this work. A con. of (300 ppm) of ethanolic extract of propolis on a 3rd day of treatment, had a lethal effect on mosquito 3rd instar larvae, resulting in a mortality rate of 100%, followed by a con. of (250 ppm), which caused in a morality rate of 91.52 percent of larva during the seventh day of experiment. The acetone extract con. of (1000 ppm), on the other hand, killed almost all of the larvae during the 3rd day of experiment, while the (750 ppm) con., killed 89.65 percent of the larva on the seventh day of experiment. On a fourth day of experiment, a con. of (1000 ppm) of methanol extract of propolis caused 100 percent mortality of larvae, followed by a con. of (750 ppm) that caused 90 percent fatality of larvae during the seventh day of experiment. In the status of the aqueous extract, the mortality percentage reached 100% on the 6th day of experiment at a con. of (5000 ppm), followed by 66.66 percent mortality of larvae during the 7th day of experiment at a con. of (4000 ppm), compared to the control group, where the highest percentage was 3.33 percent in the acetonic extract of propolis.