标题：Insecticidal A ctivity of Piper aduncum f ruit and Tephrosia vogelii leaf mixed formulations against Plutella xylostella (L.) (Lepidoptera: Plutellidae). Journal of Biopesticides,
摘要：The emulsifiable concentrate (EC) and wettable powder (WP) of Piper aduncum and
Tephrosia vogelii mixed formulations were tested for their activities in the laboratory
and their effectiveness in the field against cabbage pest Plutella xyostella. Cabbage
leaves soaked in six different mixed formulation concentrations were tested against
second instar larvae of P. xylostella and observed until the larvae reached fourth instar
stage. From the survived larvae, growth and development, antifeedant effects were
recorded. Field efficacy test was based on LC95 value of formulations from laboratory
test result. The experiment used a randomized block design with 5 treatments and 3
replications to determine the insecticide effectivity against populations of P. xylostella
larvae. The results showed that the EC and WP mixed formulations have insecticidal
activity against P. xylostella larvae, with LC95 value of 0.35% and 0.37%, respectively.
The highest antifeedant effect on EC mixed formulation was 85.01% and WP mixed
formulation was 86.23%. Both mixed formulations also slowed the development of
larvae when compared with control. Field effication result showed that applications of
EC mixed formulation were able to restrain the population of P. xylostella, with
effectivity value of 71.06%. Insecticide effectivity value of EC mixed formulation was
higher than WP mixed formulation and Bacillus thuringiensis formulation.
