Fungi Associated with Dates in Saudi Arabia.

The fungal counts per gram of air-dried dates, of eight local date-palm varieties, varied markedly on different synthetic media. Seri and Shakra varieties had highest fungal counts whereas Medina had the lowest. Aspergilus flavus , A. niger , Penicillium rubrum , P. oxalicum , Rhizopus stolonifer , Stemphylium verruculosum and Fusarium sp. were generally associated with various date varieties. Apparent colonization of the fungi was obtained by increasing the relative humidity to 90% at 30 and 40°C. Best growth of the isolated fungi in artificial media was obtained at 60% glucose concentration.