Morphological abnormalities in Tribolium castaneum (Herbst) and Tribolium confusum Duval due to cyromazine and pirimiphos-methyl treatments alone or in combination
Keywords:abnormalities, Tribolium, cyromazine, pirimiphos-methyl
Newly hatched (24 h old) larvae of Tribolium castaneum and T. confusum were allowed to feed on
different doses of cyromazine or pirimiphos-methyl, or on a combined dose of both compounds up to
pupation. All the treatments produced deformities at all the life stages. Cyromazine produced a number of abnormalities in the larval stage (P < 0.001) of the two species. Both the compounds
produced similar type of deformities in the adults, but the effect was slightly more in the female T.
confusum. The combined action (10 ppm cyromazine + 0.1 ppm pirimiphos-methyl) of the compounds
also produced deformities at each stage; and the effects were more pronounced than the effect
caused by a single dose of either 10 ppm cyromazine or 0.1 ppm pirimiphos-methyl, and this will
produce less stress on the environment and human health.