THE EFFECT OF METHYL BROMIDE ON THE RESPIRATION OF THE CADELLE TENEBROIDES MAURITANICUS (L.) (COLEOPTERA: OSTOMIDAE)

Abstract

Determinations have been made of the oxygen consumption of individual Tenebroides mauritanicus (L.) under fumigation with controlled dosages of methyl bromide. When the LD₅₀ was applied, it was found that individuals characterized by a high normal respiratory rate were more likely to be victims than those with a low rate. The respiratory rate remained unchanged during the five-hour exposure to methyl bromide while the insects showed the complete succession of symptoms from hyperactivity to paralysis. Subsequently there was a gradual decrease in respiration until death. Pretreatment of the insects with a sublethal dose of the fumigant did not increase their resistance to lethal doses, thus confirming the absence of "protective stupefaction".