الفهرس 
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Abstract
An isolate of alternaria sp. Was studied as a potential biocontrol agent for waterhyacinth. The aspects studied included : taxonomic identification, host range, sporulation, efficacy of spore vs. mycelial inoculum. Phytotoxin production, optimum conditions for inducing virulence, and bioherbicide formulations. Alternaria cassiae, abioherbicide agent for siklepod ( cassiae obtusifolia), was used as an analogue in certain experiments. Our ultimate goal is to develop a bioherbicide to control waterhyacinth in waterways in Egypt ; this study paved the way toword this goal.Among the three Egyption isolates of alternaria, isolate no 5 was the most virulent on waterhyacinth. Based on spore measurements, growth characteristics, and pigmentation, in comparison with an authentic culture of a. eichhorniae.the Egyption isolates no.5 and no.3 were identified as a. eichhorniae nag raj and ponnappa and isolate no.6 as a. alternate ( fr.) keissler.