Fumigation science is a broad field that is concerned with a variety of scenarios from postharvest and soil fumigation to structural and consignment fumigation. Application of fumigants is similarly varied and includes: solid phosphine pellets, sulfur dioxide pads, and direct gas injection to name a few. While the application methods and uses of fumigants are diverse, the end goal is always the same: maintain a headspace concentration of fumigant for a set duration until a particular mortality of the target pest is achieved. Haber’s rule, Czt = ω, is the basis for relating concentration (C) and time (t) to an empirical level of response (ω) in fumigation science. The parameter z is an empirically determined ratio of the relative importance of C and t toward ω and can vary for each fumigant-pest combination. Here we discuss the differences in z for exposure-response curves of Halyomorpha halys treated with either ethyl formate or sulfuryl fluoride as well as differences in diapausing and non-diapausing physiological states as a response to both fumigants.

Haber’s rule and insect fumigant interactions: a case study of ethyl formate, sulfuryl fluoride, and Halyomorpha halys

ACS Fall 2020 Virtual Meeting

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