Allelochemicals produced by L camara showing its highest
degree of toxicity towards water hyacinth under laboratory
conditions (Saxena, 1992). Laboratory experimental results may
not be necessary by at par with field results because of the
presence of various intercalating factors in the field which are
totally absent under controlled laboratory conditions. Lantana
successfully reduced the growth of water hyacinth for a short
period (within 10 day) at 1.2 % concentration. In long run, it
arrested the proliferation and spreading of water hyacinth by
deterioration of underground rhizome and limiting off shoot
formation and new bud sprouting. The results revealed that about
23.27 % reduction in above ground parts and 43.34% in
belowground parts (roots & rhizome) was observed in the dry
weight of water hyacinth. Growth of water hyacinth reduced to
38% (Gopal, 1987) when used N. eichhorniae in Combination of
white amur (Ctenopharygodon idella). The toxicity of Lantana
increased with its concentration and was found maximum at 3%.
It was toxic even at 1% under experimental conditions. In earlier
experiment aqueous 3 % leachate from mature Lantana plants
significantly reduced the growth and development of water
hyacinth by the 21st day