排序方式: 共有2条查询结果,搜索用时 0 毫秒
1
1.
Mahsa Akbarzadeh Aboozar Soltani Mohammad Djaefar Moemenbellah-Fard Mohammad Javad Khoshnoud 《毒物与环境化学》2020,102(1-4):92-104
AbstractThis research is conducted to determine the larvicidal, repellent and pathological effects of fruit extracts of C. colocynthis on malaria vector mosquito, Anopheles stephensi Liston, 1901. The fruit water and ethanol extract of C. colocynthis were concentrated for larvicidal and repellent activities on human volunteer against An. stephensi. The temephos larvicide was tested as the positive control. A concentration of 300?mg/L had full-scale mortality and the most toxic effect. The LC50 and LC90 values of C. colocynthis water and ethanol extracts were 180and 283?mg/L, respectively. The LC50 and LC90 values of temephos were 0.2706 and 1.6932?mg/L, respectively. The ED50 and ED90 values of the plant extract were 0.2 and 1.3?mg/cm2, respectively. Thin sections from treated larvae exhibited gross histopathologic effects of C. colocynthis fruit extracts on gut epithelial cell layer by vacuolization of foregut cuboidal and midgut columnar cells. This study suggested that the fruit extracts of C. colocynthis had significant larvicidal and repellent activity to be used as an ideal approach to control the malaria vector mosquito. 相似文献
2.
Among the many larvicides tested for the control of
s.l. larvae, the vector of human onchocerciasis in West Africa, pyraclofos proved to be 100% effective at 100 μg × L−1 for 10 min in river, with a carry of 20 km at 100 m3 × sec−1. Tests were then performed both in laboratory and field conditions to evaluate its toxicity on the non-target aquatic fauna. In experimental short-term gutter tests, the detachment of the total benthic insects was 35% at 100 μg × L−1 for 10 min against 17% for temephos at the same dose and 59% for chlorphoxim at 50μg × L−1 for 10 min.
,
and
were the most affected organisms. The treatment of a river resulted in a considerable detachment of the same taxonomic groups, plus Orthocladiinae. On the other hand, investigations conducted in tanks showed that the 24-hr LC50 for
is 150 μg × L−1 and that for
170 μg × L−1, values which are not very different from the operational dose of the larvicide (100 μg × L−1 for 10 min.). Nevertheless, in a river, no fish mortality was recorded. Based on fish LC50 and drift of benthic insects, pyraclofos at 100 μg × L−1 was judged to be less toxic to aquatic fauna in the short term than permethrin and carbosulfan. 相似文献
1