Publications by authors named "Roger A Downer"
A Skinner mercury vapor light trap was operated from 2001 through 2009 in a residential backyard to document biodiversity within the moth families Thyatiridae, Drepanidae, Geometridae, Mimallonidae, Apatelodidae, Lasiocampidae, Saturniidae, Sphingidae, Erebidae (including Lymantriinae and Arctiinae), Euteliidae, Nolidae, and Noctuidae. When making comparisons to older literature, we recalculated our results to conform to the older classification of the Noctuoidea. Moths were released after identification.
View Article and Find Full Text PDFThe development of resistance to an insecticide under various types of application method has yet to be reported in the literature. Five fall armyworm Spodoptera armigera (JE Smith) colonies were reared in a chamber for ten generations before starting topical application bioassays. From each colony, 200-500 third-fourth-instar larvae were fed for 72 h on corn plants sprayed with cypermethrin or spinosad at minimum application rate (20 g ha(-1)) using a small droplet size nozzle XR8001VS (volume median diameter D(v0.
View Article and Find Full Text PDFArticle Synopsis
- Three different sprayers were tested to see how well they retained and applied two pesticides (spinosad and azadirachtin) on a soybean plant canopy in a greenhouse setting.
- Results were evaluated based on the pests treated, including thrips, mites, and aphids, and effectiveness was measured by their abundance on the plants.
- The study highlighted that while all sprayers influenced the retention of the pesticides, only those using the manufacturer's recommended volumes significantly affected pest populations, indicating that application volume is crucial to treatment efficacy.