Using rice grounded with the essential oils, mortality ranged
from 10 and 85% after 48 h. Oils of Z. officinale was the most
efficient, causing 85% mortality at low concentration (1%)
after 48 h. In fumigation, oils of Z. officinale had lower LC50
and were effective after a shorter exposure time, causing 70%
mortality after 24 h. Mortality due to C. citratus and Mentha
sp. Essential oils was between 60 and 80% in 24 h.