A. P. Gutierrez, P. Neuenschwander, F. Schulthess, H. R. Herren, J. U. Baumgaertner, B. Wermelinger, B. Lohr, C. K. Ellis, Analysis of Biological Control of Cassava Pests in Africa. II. Cassava Mealybug Phenacoccus manihoti, Journal of Applied Ecology, Vol. 25, No. 3 (Dec., 1988), pp. 921-940
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Gutierrez et al. (1988) studied this question.