[Influence of growth development inhibitors on the reproduction of Musca domestica (Diptera: Muscidae)]. / Influencia de inhibidores del desarrollo sobre la reproducción de Musca domestica (Diptera: Muscidae).

An experiment with a strain of Musca domestica susceptible to insecticides and treated with different doses of 2 insects' development inhibitors: Juvenon and S-31183, was carried out. These compounds were added to food supplied to third-stage larvae. On calculating dosage-mortality lines, it was found a greater biological activity in S-31183. Those surviving DL90 were selected for fecundity and fertility studies. The following crossings were carried out: treated females x treated males, treated females x untreated males, untreated females x treated males, untreated females x untreated males (control group). In both compounds it was observed a remarkable reduction in the production and eclosion of eggs, on comparing the first three crossings with the control group. As regards fecundity, sex influences were not observed, whereas fertility was more affected by treated females. No differences were found in connection with the survival of all types of crossings. Morphological affectations are reported in pupae and adults.

[An oviposition study of the nematode parasitic on Culicidae Romanomermis iyengari in the laboratory]. / Estudio de la oviposición del nematodo parásito de culícidos Romanomermis iyengari en el laboratorio.

Laboratory studies allowed determine that female Romanomermis iyengari Welch, 1964, had a reproductive potential of 1975, 29 eggs in an average time of 21,76 days in distilled water with pH of 4.5 and a temperature of 25 +/- 2 degrees C. It was found that females of this nematode began oviposition in an average time of 14.65 days from the moment of emersion of postparasites of the host larvae. In studying the embryonic development, it was observed that the time elapsed from oviposition to egg hatching and the emersion of preparasites was 290,74 hours. It was determined that the optimum time to begin the exploitation of cultures and obtain a greater yield of preparasites under laboratory conditions is the sixth week of storage.

[Fecundity and embryonal development of Romanomermis culicivorax]. / Fecundidad y desarrollo embrionario de Romanomermis culicivorax.

Romanomermis culicivorax (Ross and Smith, 1976) eggs completed the late preparasite curling phase of their embryo development in an average time of 11 days and at a temperature of 25 +/- 2 degrees C. It was also observed that female R culicivorax specimens laid 312 eggs in 13 days, when male and female specimens were placed in a substrate of distilled water with a pH = 4.5.