@article{fdi:010027267,
  title = {{S}easonal changes of secondary compounds in the phloem sap of cassava in relation to fertilisation and to infestation by the cassava {M}ealybug},
  author = {{T}ertuliano, {M}oukaram and {C}alatayud, {P}aul-{A}ndr{\'e} and {L}e {R}ü, {B}runo},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he 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 ({P}henaccocus manihoti), could be influenced by different kinds of soil fertilisation (manure, {NPK}, {KC}1, lime, mulch). {I}t was found that mean cyanide and rutin contents varied significantly with season, soil treatments and infestation. {F}or each soil treatment, the highest contents of these compounds on uninfested plants was registered in the main dry season ({J}ul-{A}ug) for cyanide and at the end of the dry season ({J}ul-{A}ug) and beginning of the rainy season ({O}ct-{N}ov) for rutin. {T}he infestation factor induced an increase in cyanide and rutin contents for 43 combinations of period and soil treatment among 48 in total. {F}or cyanide content (phagostimulant function in mealybug), this increase appeared significant at the end of the rainy season ({A}pr-{M}ay) and in the main dry season ({J}ul-{A}ug) for control and {KC}1 fertilisation. {F}or rutin content (an unfavourable substance for the insect) significant increase was induced by infestation in each period for manure and mulch and especially in the main dry season ({J}ul-{A}ug) and at the beginning of the rainy season ({O}ct-{N}ov) for other soil treatments. {C}oncerning the seasonal variations in the level of rutin, these results showed that mulch and manure 

are the best fertilisers to increase cassava resistance against mealybugs},
  keywords = {{MANIOC} ; {INSECTE} {NUISIBLE} ; {ETHOLOGIE} ; {RELATION} {HOTE} {PARASITE} ; {RESISTANCE} {DE} {L}'{HOTE} ; {COMPOSITION} {CHIMIQUE} ; {GLUCOSIDE} {CYANOGENETIQUE} ; {METABOLISME} ; {FERTILISATION} {DU} {SOL} ; {VARIATION} {SAISONNIERE} ; {CYANURE} ; {RUTINE} ; {SEVE} ; {ANTIBIOSE} ; {ANTIXENOSE} ; {ETUDE} {D}'{IMPACT} ; {CONGO} ; {BRAZZAVILLE}},
  booktitle = {},
  journal = {{I}nsect {S}cience and its {A}pplication},
  volume = {19},
  numero = {1},
  pages = {91--98},
  ISSN = {0191-9040},
  year = {1999},
  DOI = {10.1017/{S}1742758400016635},
  URL = {https://www.documentation.ird.fr/hor/fdi:010027267},
}