Screening of Costa Rican Trichilia species for biological activity against the larvae of Spodoptera litura (Lepidoptera: Noctuidae)

被引:33
|
作者
Wheeler, DA
Isman, MB [1 ]
Sanchez-Vindas, PE
Arnason, JT
机构
[1] Univ British Columbia, Fac Agr Sci, Vancouver, BC V6T 1Z4, Canada
[2] Univ Nacl Heredia, Heredia, Costa Rica
[3] Univ Ottawa, Dept Biol, Ottawa, ON K1N 6N5, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Trichilia; T; americana; Meliaceae; Spodoptera litura; insecticidal activity; life history;
D O I
10.1016/S0305-1978(00)00070-3
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Crude methanolic extracts made from the twigs of 39 plant samples from six species of Trichilia collected in Costa Rica, were incorporated into artificial diet and fed to neonate Spodoptera litura larvae. All six plant species tested significantly reduced larval growth after 7 and 10 days. The most active species was T. americana, reducing growth, on average, to 3.9% of control at 1000 ppm fresh weight. The least active, on average, was T. glabra. A twig extract of T. americana proved to be more active than wood, bark or leaf extracts, with the twig extract reducing growth of S. litura larvae by 50% (EC(50)) at a dietary concentration of 17.2 ppm. When 7. americana wood extract was incorporated into artificial diet (10, 25, 50 and 75 ppm) and fed to S, litura larvae throughout larval development, growth was slowed and the final weight of pupae and adults was reduced. At higher extract concentrations (50 and 75 ppm) larvae entered one or two supernumerary instars before pupation occurred. This was shown to be due to both starvation and to post-ingestive activity of the extract. (C) 2001 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:347 / 358
页数:12
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