Aspergillus flavus AND AFLATOXIN LEVELS IN STORED MAIZE IN EASTERN KENYA AND ANTIFUNGAL ACTIVITY OF SOME PLANT EXTRACTS By THEDDEUS MUANGE KISWII 156/10619/06 A Thesis Submitted In Partial Fulfillment Of The Requirements For The Award Of The Degree Of Master Of Science (Microbiology) In The School Of Pure And Applied Sciences Of Kenyatta University OCTOBER 2009