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Plants exhibit a remarkable capacity to discern between self-inflicted damage, herbivore attacks, and mechanical harm through pattern recognition, detecting specific signals associated with each type of damage. Mechanical damage significantly influences plant defence responses against herbivorous insects. This study aimed to artificially activate the plant defence system and observe the performance of aphid (Myzus persicae Sulzer)(Hemiptera: Aphididae) and their parasitoid (Diaeretiella rapae M’Intosh)(Hymenoptera: Braconidae) on brassica plants. Mechanically damaged and undamaged plants were subjected to aphid infestation, and various parameters related to aphid and parasitoid performance, including adult survival, fecundity, aphid settlement, and oviposition behavior, were measured. Results revealed that plants with artificial damage exhibited greater resistance to aphids than undamaged plants. In …