In this study, the counter effect of two Biological Control Agents, namely Trichoderma harzianum fungi and Bcillus subtilis bacteria against the fungi-like organism Phytophthora infestans and the fungi; Fosarium solani and Rhizoctonia solani isolated from orange-trees' bark and from lemon-trees' roots. The results showed that the counter effect of T. harzianum (using double culture on petri dishes) reached 1.0 according to Bell scale, against all these pathogens. The counter effect of this antibiotic was also tested in vitro on branches taken from citrus trees and infected with Phytophthora infestans. The infection percentages before treatment with T. harzianum were 75% and 58.3% for the branches isolated from lemon trees and orange trees respectively, whereas after treatment with the inhibition fungi, the percentages of infection were 25% and 16.6% for the branches isolated from lemon trees and orange trees respectively. The percentages of inhibition by Bacillus subtilis bacteria were 83%, 71% and 73% against Phytophthora infestans , Fusarium solani and Rhizoctonia solani respectively
This study was conducted for the purpose of finding local isolates which produce the cellulase enzyme. Specific test was conducted to determined the ability of these isolates to produce cellulase on solid and liquid media, also to find out the best isolates producing this enzyme. A quantitative test was carried out find the best cellulose producing isolate, which was Alternaria alternate isolated from cowpea, as it produced 5.26mg glucose/60min /cm 3 and 0.315 mg/cm 3 glucose.
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