الفهرس 
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Abstract
Survey studies revealed that the frequency of Fusarium species associated with cotton seedlings or plants was varied with sampling date, location, cotton cultivars and previous crops. Since the least frequency
was obtained in April 2000 (35.58%). While the highest frequency (69.2%) was given by June 2000. Previous crop broad bean exhibited
higher frequency than clover plants.
Frequency of Fusarium species associated with seeds was differed with cotton cultivars. Cultivar Giza 89 gave the highest frequency (12%) while cv. Giza 85 revealed the least frequency (2%).
Pathogenicity trials showed various infectivity for different isolates of Fusarium to cotton cultivars. Nine Fusarium species, i.e.
fusarioides, moniliforme, moniliforme var. subg/utinans, oxysporum, poae, sambucinum, so/ani and sporotrichioides were isolated. Since F. fusarioides and F. sporotrichioides recorded as a new additional pathogens to cotton plants. While F. so/ani expressed the highest disease severity (59%) and F. fusarioides gave the least disease severity
(47.75%). Cotton Giza 87 cv. showed the least disease severity (40.4) and Giza 90 existed the most
Fusarium species were able to infect cowpea, roselle and okra plants. Roselle plants were the most susceptible (gave 36.7% disease severity) while okra plants were the least susceptible (expressed 24.75% disease severity). F. moniliforme was the most aggressive (exhibited 38.3% disease severity) but F. fusarioides was the weakest pathogen
since it caused 29.15% disease severity. Cowpea plants were the most susceptible to F. . moniliforme infection while roselle plants exhibited the
most susceptibility (45% disease severity) under F. sporotrichioides infection .Okra plants gave the highest disease severity (30%) under infection by either F. fusarioides or F.semitectum.