Calatayud, P.A., Tertuliano, M., & Le Rü, B.P. 1994 Seasonal changes in secondary compounds in the phloem sap of cassava in relation to plant genotype and infestation by Phenacoccus manihoti (Homoptera: Pseudococcidae).. Bulletin of Entomological Research 84: 453-459.

Notes: Results indicate that when cassava is in drought stress conditions during the dry season foliar area decreased, and leaf water potential decreased, leading to conditions unfavourable to P. manihoti.