TOXICITY AND GROWTH-REGULATING ACTIVITY OF A NEEM SEED KERNEL EXTRACT (AZAL-S) TO THE LARVAE OF CULEX QUINQUEFASCIATUS期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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TOXICITY AND GROWTH-REGULATING ACTIVITY OF A NEEM SEED KERNEL EXTRACT (AZAL-S) TO THE LARVAE OF CULEX QUINQUEFASCIATUS

Authors:	Ping Jin Xiaojun Pan Shanhuan Zhao

Institution:	Department of Parasitology, Guangzhou Medical College;, Guangzhou, Guangdong 510182, China Department of Biology, Guangzhou Teachers College;, Guangzhou, Guangdong 510400, China Laboratory of Insect Toxicology, South China Agriculturul University;. Guangzhou, Guangdong 510642, China

Abstract:	Abstract Toxicity of a neem seed kernel extract (AZAL-S) was assessed under laboratory conditions against larvae of Culex quinquefasciatus . The LC₅₀ value for AZAL-S was 0.78× 10–6. Exposure of 4th instar larvae to 0. 3× 10–6 and 0. 5× 10–6 AZAL-S for 120 hours caused 46. 2% and 67. 5% mortality respectively, with various types of morphogenetic aberration. AZAL-S induced an obvious prologation of the larval period when 1st instar larvae were treated with 0. 4–1. 0× 10–6 AZAL-S for 7 days. The insect growth regulating effect of AZAL-S on mosquito larvae was similar to those reported for certain insect growth regulators.

Keywords:	Azadirachta indca neem seed kernel extract Culex quinqurfusciutus toxicity growth-regulating effect