Observation over three years indicated that with the exception of P.stratiotes
and C.alopecuroides, the major economic crops, weeds and ornamental plants surrounding
water courses with diseased Waterhyacinth showed no signs of infection by A.alternata.
Application of the fungus crude toxins to tested plants increased the host range to include
Ipomoea tricolor, Nymphaea lotusand Lemna gibbain addition to Waterhyacinth. We also
found that a toxin plus fungal combination applied to tested plants, enhanced the degree of
susceptibility but not the hosts range