An agronomist talking to farm workers about placing cones containing microscopic trichogramma wasps in cotton fields. Trichohramma, a natural enemy of the bollworm, lays its eggs inside the bollworm eggs. The trichogramma larvae feed off the bolloworm eggs therefore resulting in the fact that only the wasp eggs hatch. - - Integrated Pest Management Project. In the early 1980's, the Food and Agriculture Organization of the United Nations, in cooperation with the Nicaraguan Ministry of Agriculture and the University of Leon, financed a project to develop and integrate a pest management programme in the cotton growing region of Nicaragua near the city of Leon. The technical training and funding, provided by FAO, was instrumental in launching the programme, which now continues under the auspices of the Biological Control Laboratory of the University of Leon in conjunction with the Ministry of Agriculture.