A group of entomologists from the Purdue University of Indiana has exposed for six months to different groups of cockroaches against various chemical products in order to study their strength against chemicals. During the study it was observed that insect populations not only did not decline, but that they maintained or even increased.
The project consisted in grouping several sets of Blattella germanica (better known as blonde cockroach), the most common cockroach on the planet, and expose them to different pesticides and in different ways; a group was kept isolated with three pesticides that were rotated monthly; another was kept isolated for six months under a mixture of two products that did not change; and for the latter, a single pesticide was reserved for spraying in the full half year.
The conclusions were clarifying: the only group in which the population remained stable was that which was submitted to the alternate use of the three pesticides; in the others, the number eventually grew. The scientists found that cockroach offspring were able to develop resistance to the chemicals, so they were immunized against its effects.
Michael Scharf, leader of the research, concluded that "the generations endured up to 4 and 6 times more than at the beginning"And that" cockroaches that develop resistance to chemicals will be impossible to eradicate in the future only with insecticides. "
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