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Fumigation with sulfuryl fluoride (Vikane® Gas Fumigant)2 is often used to control structural infestations by anobiid and true powderpost beetles that are widespread or inaccessible to insecticidal surface treatments. Beetle eggs show a wide range of tolerance to sulfuryl fluoride that varies with the age of eggs making them the limiting factor for control. To study dosage requirements for eggs, ovicidal activity tests of sulfuryl fluoride were done by exposing 1- to 7-day-old anobiid, Euvrilletta peltata (Harris) and lyctid, Lyctus brunneus (Stephens), eggs respectively, during tent fumigations of a house. Fumigations resulting in mg-h/liter accumulations of 470 and 289, 5.2 and 3.2 times the drywood termite dosage of 90 mg-h/liter for 22.2°C, permitted some survival and subsequent hatching of lyctid eggs aged 1 and 2 days, with the latter being most tolerant. All other ages of eggs were susceptible to these dosages. At the 3.2-fold rate, the mean survival for eggs of all ages was 11.6%, but 70.2% of the 2-day-old eggs survived. At the 5.2-fold rate, only 3.9% of the eggs survived, primarily due to 24.7% survival of 2-day-old eggs. No differeences were observed between 289 and 470 mg-h/liter dosages for anobiid beetle eggs; the least susceptible apparently were eggs aged 2 to 4 days old. Additional studies are recommended to better define effective rates for controlling eggs of these beetles with reduced levels of gas. To aid logistics, such studies could be confined to the ovicidal activity of 6-fold and lower dosages on the most tolerant ages of eggs.

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Random populations of field-collected Xyletinus peltatus (Harris) beetles laid significantly more eggs on yellow-poplar than on any of seven other woods placed in a crawl space beneath a house and in a controlled environment. Egg deposition of random beetle populations when confined to individual woods was generally greatest on woods most often chosen for choice oviposition, but no significant statistical preference was shown for any wood. In tests with beetles collected in copula to ensure equal representation of sexes and that mating had occurred, yellow-poplar was again preferred for egg-laying. Variability in oviposition and fewer eggs per female by beetles collected while mating suggests that these beetles may have mated and laid eggs previously. The third test, with wood of varying ages since tree felling, suggested that beetles prefer at least some woods to be aged and also indicated preference for yellow-poplar. In all three choice experiments beetles showed a significant preference for block undersurfaces for egg-laying; this preference possibly indicated responses to changing ambient light conditions. Egg-laying females appeared to respond first to favored hosts, then to block undersurfaces or oviposition site characteristics. Both host species and wood surface features would affect susceptibility to beetle attack.