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Mortality and frass production bioassays were used to investigate the toxicity of seven strains ofBacillus thuringiensisagainst the adult carrot weevil,Listronotus oregonensis(Le Conte). A semi-artificial diet of carrot foliage with 4% agar was selected to maximize feeding by the insects.Bacillus thuringiensissubsp.tenebrionis(Krieg, Huger, Langenbruch, and Schnetter) (BTT) and two unidentifiedB....
Xenorhabdus nematophilus(three strains),Xenorhabdus bovienii(one strain), andPhotorhabdus luminescens(one strain) showed both exo- and endochitinase activity usingp-nitrophenyl-N-acetyl-β-d-glucosaminide andp-nitrophenyl-β-d-N,N′,N″- triacetylchitotriose, respectively, as substrates. One to three bands were detected on PAGE gel with glycol chitin after electrophoresis. Variation in exo- and endochitinase...
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