Methyl eugenol

Methyl-eugenol is an attractant used to draw male oriental fruit flies and melon flies to poisoned bait. In a program begun in 1960 across the Bonin Islands, it was combined with poison and distributed on small pieces of fiberboard; a year later, the Agriculture Department estimated that more than 99 percent of the fly population had been eliminated. The method’s significance lies not only in that reported result but in how it confined the poison, offering a contrast to the broad dispersal of insecticides that the book criticizes elsewhere.

Properties and use

Government scientists developed methyl-eugenol as an attractant to which male oriental fruit flies and melon flies were described as irresistible. The account does not treat the chemical as a pesticide in itself: its role was to lure the targeted males, while a separately combined poison killed them. The distinction between attractant and toxicant is central to the method, which sought to direct lethal exposure rather than spray it indiscriminately.

The Bonin Islands program

Tests took place in the Bonin Islands, 450 miles south of Japan. The bait consisted of small pieces of fiberboard impregnated with methyl-eugenol and poison. These were distributed by air over the island chain, carrying the lure-and-kill combination across the target area without broadcasting the poison in the conventional manner.

The program, called “male annihilation,” began in 1960. One year later, the Agriculture Department estimated that more than 99 percent of the population had been eliminated. The account gives this figure as the department’s estimate, not as an independently qualified measure, and identifies the result as a striking outcome of the campaign.

Containment and environmental contrast

The poison used in the bait was an organic phosphorus chemical. In the account’s comparison with conventional insecticide broadcasting, the treated poison remained confined to squares of fiberboard, which were considered unlikely to be eaten by wildlife. Its residues were also described as dissipating quickly, making them unlikely to contaminate soil or water.

These features give the method a particular place in the book’s discussion of pest control. The program still used poison and aerial distribution, but the bait’s limited format narrowed the route by which wildlife might encounter it, while rapid dissipation reduced the prospect of persistent environmental residues. Methyl-eugenol’s function as an attractant thus belonged to a more targeted design: draw the male flies to a contained toxicant rather than spread insecticide broadly through the environment.