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Essential oils (EOs) obtained by hydro-distillation from different parts of twigs (EOT), leaves (EOL), and fruits (EOF) of <i>Eucalyptus gunnii</i> Hook. f. were screened for their chemical composition, insecticidal, repellence, and antibacterial properties. Based on GC and GC/MS analysis, 23 constituents were identified across the twigs, leaves, and fruits, with 23, 23, and 21 components, respectively. The primary significant class was oxygenated monoterpenes (82.2–95.5%). The main components were 1,8-cineole (65.6–86.1%), α-terpinyl acetate (2.5–7.6%), o-cymene (3.3–7.5%), and α-terpineol (3.3–3.5%). All three EOs exhibited moderate antibacterial activities. EOL was found to have higher antibacterial activity against all tested strains except <i>Dickeya solani</i> (CFBP 8199), for which EOT showed more potency. Globally, <i>Dickeya solani</i> (CFBP 8199) was the most sensitive (MIC ≤ 2 mg/mL), while the most resistant bacteria were <i>Dickeya dadantii</i> (CFBP 3855) and <i>Pectobacterium carotovorum</i> subsp. <i>carotovorum</i> (CFBP 5387). Fumigant, contact toxicity, and repellent bioassays showed different potential depending on plant extracts, particularly EOT and EOL as moderate repellents and EOT as a medium toxicant.