Abstract:
Abstract
Samples with brown spot symptoms on Paphiopendilum sp. Leave were collected and
isolated. Four isolates of Colletotrichum spp. were collected and used to study the efficiency of
chemical and biological control of Colletotrichum spp. in laboratory. To study the efficiency of
the fungicide to eliminate mycelium growth, Carbendazim Benomyl and Captan at several
concentrations were selected. The results showed that all of concentrations of Carbendazim and
Benomyl had proved very effective suppression the mycelium growth and development all of
Colletotrichum spp. isolates from the concentration of 100 mg/l (100%) while Captan was the low
effective suppression. To study of the efficiency of chitosan to suppress the mycelium growth
and development, chitosan at the concentration between 100-3000 mg/l were used for test. The
results showed that chitosan was low efficiency to suppress the mycelium growth and
development all of Colletotrichum spp.isolates (3.6-11.6%). Two types of herbal extract consist
of Aglaia odorata Lour (30% W.P) and Jusminum officinale L. (30% W.P) were observed for
suppression the mycelium growth and development at the concentration between 100-5,000 mg/l.
The results showed that all of herbal extract at the concentration of 5,000 mg/l showed
suppression on the mycelium growth and development compared all of Colletotrichum spp.
isolates (Aglaia odorata Lour (30% W.P) at 49.4-78.8% and Jusminum officinale L. (30% W.P) at
56.4-78.6%, especially). The ability of Trichoderma harzianium to control Colletotrichum spp.
was observed. T. harzianium have proved variable suppression to all of Colletotrichum spp.
isolates for 100%.