tristeza
noun
tris·te·za
| \ tri-ˈstā-zə
\
\
Definition of tristeza
: a highly infectious disease of citrus trees grafted on sour orange rootstocks that is caused by a single-stranded RNA virus (species Citrus tristeza virus of the genus Closterovirus, family Closteroviridae) transmitted by aphids and that eventually causes death of the trees
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