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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Comparative activity of fenoxycarb and hydroprene in sterilizing the German cockroach (Dictyoptera: Blattellidae).

Last-instar German cockroaches, Blattella germanica (L.), were treated topically with the juvenoids, fenoxycarb and hydroprene, and observed for reproductive capabilities during adulthood. Hydroprene had a significantly lower SD50 (dose required to sterilize 50% of the cockroaches) for males (39.82 micrograms/g body weight) compared with females (86.64 micrograms/g body weight). In contrast, SD50's of fenoxycarb did not differ significantly between the sexes (18.04 and 13.66 micrograms/g body weight for females and males) and were significantly lower when compared with SD50's of hydroprene. A strong positive relationship between wing twisting (a morphogenetic effect caused by juvenoids) and sterility was observed among cockroaches treated with 100 and 10 micrograms/microliters of each juvenoid. However, only 16% of females displaying twisted wings were sterile when treated with 1 microgram/microliter of hydroprene. Cockroaches treated with 100 micrograms/microliters of hydroprene lived 10-14 wk fewer than control adults and often attempted a sixth (supernumerary) molt.[1]


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