Abstract:
Utilization of palm oil solid waste has not been carried out optimally, only shells have been used as fuel for
broilers in palm oil processing plants, while there are still many other wastes that have not been utilized. Solid waste in
the form of empty fruit bunches and shells can be processed into liquid smoke by the pyrolysis process. Considering the
potential of liquid smoke as an insecticide, a research was conducted with the aim of studying the effect of liquid smoke
on Spodoptera litura larvae in the laboratory and the ability of liquid smoke to control leaf pests of mustard, soybeans,
and soybean pods. The study was conducted with a completely randomized design. Leaf sandwich and spray methods
were tested on S. litura in laboratory and spraying liquid smoke solution on mustard and soybeans in the field. The
results of the research in the laboratory showed that the liquid smoke treatment with the spray method was more capable
of killing S. litura larvae (60%) compared to the leaf sandwich method (16%), while the leaf sandwich method was more
able to inhibit the formation of imago. Statisticaly field research between liquid smoke treatments did not show a
significant difference in the intensity of leaf damage on both mustard and soybean plants, the only significant difference
was in the fresh weight of mustard plants. Keywords: Liquid smoke, Natural insecticide. Palm oil waste
