Yasuda, S. 1983 Effect of fertilization in mulberry plants on the sex ratio of eggs of the mulberry scale, Pseudaulacaspis pentagona (Targioni).. Journal of Sericultural Science of Japan 52: 9-12.

Notes: Sex ratios of adults of P. pentagona varied depending on the proportion of the fertilizer elements in the blends; with increased proportion of nitrogenous and phosphatic fertilizer, the rates of adult females became higher than those of the males.