Therefore, chitosan only reduced P. palmivora
activity in during the early infection state, but could not
control leaf fall disease of para rubber seedlings. In contrast
to our study, Boonreung and Boonlertnirun (2013) applied
chitosan to control dirty panicle disease of rice, caused by
Helminthosporium oryzae, Curvularia lunata, and Fusarium
moniliforme in plantation fields. They suggested it is
possible to control dirty panicle disease by spraying chitosan
onto rice plants (Boonreung and Boonlertnirun, 2013)