Laboratory populations of German cockroach reared on food treated with R-20458 (75 ppm) or Ro 20-3600 (3000 ppm) became completely sterile and eventually extinct. The hypertrophied oocytes had excessively laid chorion, and the hypertrophied accessory sex glands contained excessive amounts of protein.
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G. B. Staal, Ann. Rev. Ent.20, 417 (1975).
Y. T. Das and A. P. Gupta, Experientia30, 1093 (1974).
6,7-epoxy-3,7-dimethyl-1-(p-ethylphenoxy)-2-octene (R-20458). Generous gift from Stauffer Chemical Co., Mountainview, California, USA.
6,7-epoxy-3-methyl-7-ethyl-1-(3,4-methylenedioxyphenoxy)-2-octene (Ro 20-3600). Generous gift from Hoffmann-La Roche, Nutley, New Jersey, USA.
Little Friskies® cat food, Carnation Co., Los Angeles, California, USA.
A. G. E. Pearse, Histochemistry, Theoretical and Applied, 2nd ed. Little-Brown, Boston 1960.
P. Masner and W. Hangartner, Experientia29, 1550 (1973).
P. Masner, W. Hangartner and M. Suchy, J. Insect Physiol.21, 1755 (1975).
The situation is comparable to that of Nauphoeta cinerea in which the ovaries are capable of vitellogenesis in the last nymphai instar (B. Lanzrein, J. Insect Physiol.20, 1871 (1974)).
In Periplaneta americana, the ovaries are incompetent for vitellogenesis in the last nymphal instar (A. Girardie, J. Insect Physiol.8, 199 (1962)) and appear to require the presence of molting hormone and absence of juvenile hormone for their future vitellogenic activity in the adult (W. J. Bell and G. R. Sams, J. Insect Physiol.21, 173 (1975)).
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Das, Y.T., Gupta, A.P. Abnormalities in the development and reproduction of Blattella germanica (L.) (Dictyoptera: Blattellidae) treated with insect growth regulators with juvenile hormone activity. Experientia 33, 968–970 (1977). https://doi.org/10.1007/BF01951310
- Growth Regulator
- Excessive Amount
- Juvenile Hormone
- Hormone Activity
- Laboratory Population