EFFECT OF WATER QUALITY ON THE EFFICIENCY OF COMMIPHORA MOLMOL RESIN, MIRAZID, AND FORMULATED AND CRYSTALLINE ACETYLSALICYLIC ACIDS IN CONTROLLING CULEX PIPIENS

Faten Abo El-Dahab, M. Baz, Y. El-Sayed, Rasha Abdel Hameed, Abla Abd El Meguid
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Abstract

The mosquitoes are nuisance pests to humans and represent a global health challenge. The larvicidal activities of Commiphora molmol resin, mirazid, and formulated and crystalline acetylsalicylic acid (F-ASA and C-ASA, respectively) were evaluated against the 2 nd and 4 th instar larvae of Culex pipiens at 27°C, after 48 hours post-treatment in different water qualities. Water samples were collected from the tap, canal, and pool. The water pH, nitrate, salinity, and dissolved oxygen were measured. The results showed that the larvicidal activity of the tested compounds was increased by increasing their concentrations. The mortality reached 100% and 98.4% for the 2 nd instar larvae at 160 ppm, 100% and 90.4% for the 4 th instar larvae at 320 ppm of mirazid and C. molmol , respectively. The mortality induced by F-ASA and C-ASA reached 99.2% and 75.2% for the 2 nd instar larvae at 1200 ppm, 100% and 92.0% for the 4 th instar larvae at 2000 ppm, respectively. The efficiency of the tested materials against the 4 th instar larvae was affected by the water quality; whereas their LC 50 values were 38.3-1045.9 ppm in tap water; while at canal and pool water the LC 50 values were 44.5-1073 and 49.8-1126.0 ppm, respectively, at 27°C and 48 hours post-treatment. The correlation coefficient between the susceptibility of Cx. pipiens larvae to the tested compounds and each physicochemical factor showed a positive correlation with water nitrate and dissolved oxygen. In conclusion, mirazid, C. molmol , F-ASA, and C-ASA can be good alternative agents for controlling mosquitos’ larvae in different water qualities.
水质对红棉酚树脂、咪唑啉、乙酰水杨酸和结晶水杨酸防治库蚊效果的影响
蚊子对人类来说是一种讨厌的害虫,对全球健康构成了挑战。在不同的水质条件下,27℃条件下,48 h后,测定了红棉草树脂、米拉齐、乙酰水杨酸和结晶乙酰水杨酸(分别为F-ASA和C- asa)对库蚊2龄和4龄幼虫的杀虫活性。从水龙头、运河和水池中采集水样。测定了水的pH值、硝酸盐、盐度和溶解氧。结果表明,各化合物浓度越高,其杀虫活性越强。在浓度为160 ppm和320 ppm时,2龄幼虫死亡率分别为100%和98.4%,4龄幼虫死亡率分别为100%和90.4%。在1200 ppm浓度下,F-ASA和C-ASA对2龄幼虫的死亡率分别为99.2%和75.2%,在2000 ppm浓度下,对4龄幼虫的死亡率分别为100%和92.0%。试验材料对4龄幼虫的杀灭效果受水质影响;而自来水中的LC 50值为38.3 ~ 1045.9 ppm;处理后27℃和48 h,渠水和池水的LC 50值分别为44.5 ~ 1073和49.8 ~ 1126.0 ppm。对Cx的敏感性进行了相关系数分析。库蚊幼虫对被试化合物及各理化因子均与水体硝酸盐和溶解氧呈正相关。综上所述,mirazid、C. molmol、F-ASA和C-ASA可作为不同水质条件下蚊虫幼虫的较好替代药剂。
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