The insecticidal properties of water-extract of
Peumus boldus
Molina and its effect on the development cycle and feeding
habits of
Spodoptera
frugiperda
J.E. Smith and
Helicoverpa zea
Boddie were evaluated under laboratory conditions in
concentrations of 0.25, 0.5, 1.0, 2.0, 4.0, and 8.0% (w/w).
Spodoptera frugiperda was the most susceptible with 75%
mortality at 7 d at 8%
P. boldus concentration, while
H. zea had only 30% mortality. LC
50 was 2.31 mL kg
-1 for
S.
frugiperda and 16.05 mL kg
-1 for
H. zea. When the extract concentration increased in the diet, larval size and weight,
percentage of pupation and number of adults decreased, and the time required to reach those states was greater. Neonate
larvae fed primarily on the diet with the lower extract concentration and the control was preferred by more than 50% of
larvae. Inhibition of feeding, growth, weight gain of 3rd instar larvae as well as new biomass production decreased with
concentration of the extract.
