Tertuliano, M., Calatayud, P.A., & Le Rü, B.P. 1999 Seasonal changes of secondary compounds in the phloem sap of cassava in relation to fertilization and to infestation by the cassava mealybug.. Insect Science and its Application 19: 1, 91-98.

Notes: The aim of the present study was to determine, by a field experiment, whether the seasonal variations in the levels of cyanide and rutin in the phloem, secondary compounds potentially implicated in cassava resistance to the cassava mealybug (Phenacoccus manihoti), could be influenced by different kinds of soil fertilization (manure, NPK, KCl, lime, mulch).