Contract Research and Bioassays

Benzon Research is an independent contract research facility that performs insecticide bioassays of many types and against many species of insects. We have extensive experience with microbial agents such as B.t.'s and viruses but also work with pyrethroids, synergists, plant essential oils, IGR's and other biorationals. Just a few of the bioassays are pictured below. 

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Diet incorporation, diet surface contamination, leaf-disc, droplet feeding, and topical application bioassays can be used with any of the lepidopteran species that are colonized in-house, along with other species available from outside sources. The photo to the left shows the scoring of a baculovirus bioassay against Helicoverpa zea.

Cups containing Aedes aegypti larvae being dosed with a production lot of B.t. israelensis for label standardization. We routinely test B.t.i. fermentation broths, concentrates,  powders, granules, briquets, and other formulations from all over the world. Bioassays are also performed as part of fermentation or formulation improvement efforts and storage stability studies.

The droplet-feeding bioassay works remarkably well for certain combinations of active ingredient and species. Here, droplets containing blue dye and baculovirus particles are being presented to neonate larvae of the corn earworm, Helicoverpa zea. Fed larvae will be held on artificial diet for several days before evaluating mortality.

There has been a great deal of development of fabrics treated for insect repellency. We test many of these fabrics for ability to "knock down" mosquitoes or ticks after brief contact. This is especially useful for determining ability of fabric treatments to withstand laundering.