Sustainable low-residue interventions are urgently needed against quarantine pests of stored commodities. Thus, this study evaluated clove (Syzygium aromaticum) and marjoram (Origanum majorana) essential oils applied at 0.10–1.00 % (w/v) to three carriers (activated charcoal, cork granules, filter paper) and tested fourth-instar larvae and 7–10-day adults of Trogoderma granarium for repellency, feeding deterrence, acute mortality (24, 48, 72 h), substrate weight loss and seed germination. Repellency was life-stage dependent: adults were markedly more repelled than larvae while concentration explained negligible variance (R2 ≤ 0.09; all p > 0.05; marginal trend for adults on charcoal p = 0.060). Feeding deterrence exhibited strong log-dose responses across oils and carriers (OLS R2 = 0.59–0.88; F1,48 = 25.5–129.2; P ≤ 1.2 × 10−9), with clove producing consistently steeper slopes than marjoram. Adult and larval mortality increased with dose and exposure time; at 1.0 % clove adult mortality reached 58.1 %, 84.3 % and 92.9 % at 24, 48 and 72 h, respectively, and larval 72 h fits attained R2 up to 0.96 (P ≤ 9.45 × 10−14). Carrier choice modulated commodity impacts and germination (quadratic fits R2 ≈ 0.93–0.98). Canonical multivariate analysis identified a dominant discriminant (first canonical correlation r = 0.88; P < 0.001) linking life stage, residual mortality, feeding inhibition and weight loss. Clove on sorptive carriers (charcoal, cork) provided superior and sustained protection, supporting prioritised formulation development and targeted field validation for low-residue stored-product protection.
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