أثر الكايتوسان في بعض الخواص الحيوية للفطر Fusarium oxysporum f. sp. lycopersici Snyd. و Hans.

Abstract EN

The results of this study revealed that chitosan significantly inhibited the tested growth paramcters of Fusarium oxysporum f.

sp.

lycopersici Snyd.

& Hans (radial growth, sporulation and spore viability).

The level of the inhibition, however was found to be chitosan concentration dependent.

Chitosan at 0.75, 1.5, 3, 6 mg/ml induced 26, 23, 60 and 82% inhibition in the radial growth; and 23, 58, 78 and 87% reduction in sporulation; and 2, 14, 34 and 55% reduction in spores viability, respectively.

Chitosan concentrations above 0.75 mg/ml was found to reduce the fungal virulence on tomato plants, but such reduction was vanished by subculturing of the treated culture on chitosan free medium.