A co-fumigation strategy utilizing reduced rates of phosphine (PH3 ) and sulfuryl fluoride (SF) to control strongly resistant rusty grain beetle, Cryptolestes ferrugineus (Stephens) (Coleoptera: Laemophloeidae).

Our results confirmed that a co-fumigation strategy involving half the current standard rate of PH3 (84 g hm-3 ) with one-fourth of the current maximal registered rate of SF (370 g hm-3 ) can provide effective control of strongly PH3 -resistant C. ferrugineus.