Darvas, B., Farag, A.I., Kozár, F., & Darwish, E.T.E. 1985 Residual activity of Precocene II and Hydroprene against first instar larvae of Quadraspidiotus perniciosus.. Acta Phytopathologica Academiae Scientiarum Hungaricae 20: 347-350.

Notes: Hydroprene previously tested against Aonidiella aurantii, Carulaspis juniperi, Pseudaulacaspis pentagona, Unaspis euonymi and Aspidiotus nerii.