To investigate the SAR response in cotton and to evaluate a range of biotic and abiotic stimuli under both glasshouse and field conditions against Verticillium and Fusarium wilts and Altemaria leaf spot.

This thesis assessed the effectiveness of a formulation of a chemical activator in bringing about systemic resistance to diseases in cotton in the light of reports of its action in other plants.

Growing concern in recent years about the effects of pesticides and fungicides on the environment has led to an increased interest in alternative plant protection methods worldwide.