The study on the integrated use of the chevroned water hyacinth weevil  (Neochetina
bruchi Mustache) and the water hyacinth blight disease  (Alternaria eichhorniae Nag Raj &
Ponnappa) in suppressing water hyacinth growth was carried out under field conditions at Situ
Bagendit lake, Garut, West Java. 
The objectives of this study were (I) to investigate whether the combined use of the two
control agents produced a better effect in suppressing water hyacinth growth, (ii) to evaluate whether
there is a change in oviposition and feeding habit of the chevroned water hyacinth weevil if the water
hyacinth is seriously infected by  A. eichhorniae,  and (iii) to evaluate the progress of weevil
establishment in the field.
The following results were obtained: 
(1)       The concentration of Tween 80 which did not interfere with spore germination was 3%. 
(2)    There was no difference between distilled water and 1% Potato Dextrose Broth (PDB) as a
medium for fungal spores production.
(3)      The combined use of chevroned water hyacinth weevil and the water hyacinth blight
produces a better suppressing on water hyacinth growth. 
(4)    There was no significant effect of heavy infection by the water hyacinth blight on oviposition
habit of chevroned water hyacinth weevil. Heavy fungal infection only affected feeding habit of
the adult chevroned water hyacinth weevil. 
(5)    Establishment of the chevroned water hyacinth weevil is in progress at Situ Bagendit lake,
Garut regency, West Java.