Tridzoderma longibrnchiaturn Rifai aggr. is a fungus reported to be antagonistic to the fungus Mycenn citricolor, the
causative agent of the American leaf spot disease of coffee. We have investigated the metabolites produced when T.
Fungi of the genus Trichodertna Persoon are widespread
and their taxonomical classification is difficult. This has led
to the development of a species aggregate system of classification
(l), which groups together several "speciesn. It has
been noted, for example, that under the name Trichoderma
hamatum (Bon.) Bain aggr. there may be two or three or
more different but morphologically very similar species, and
"that isolates considered to belong to this species aggregate
may behave quite differently under different conditions" (1).
It is not surprising, then, that there is no clear pattern among
the wide variety of secondary metabolites produced by
Trichoderma strains (2, 3). In recent years considerable interest has been shown iii the use of Trichoderma species as biological control agents (4). In spite of the importance of
the genus, there are no studies reported of the metabolites
of strains of Trichoderma longibrachiaturn Rifai aggr., or of
other "yellow" Trichodermn strains, although Rifai (1) has
documented the existence of yellow pigments in Trichoderma
strains of the species aggregates T. nureoviride Rifai
aggr., T. longibrachiatum, and T. harziaizum