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Effect of Various Soilless Root Media and Insecticides on Fungus Gnats


Fungus gnat (Bradysia coprophila Lintner) adult emergence was sampled from 20 soilless root media and media combinations. More adults emerged from Paygro 5-2-2, a composted hardwood bark amended medium than from other media. Fewest adults emerged from Ball Growing Mix I, a composted pine bark amended medium. Pesticides evaluated in one or more experiments were aldicarb 10 G, bendiocarb 5 G, Oxamyl 10 G, diazinon 4 EC, methoprene 5 EC, and bendiocarb 76 WP. Where pesticide effects could be determined, all materials reduced number of emerging adults compared with untreated media, but oxamyl 10 G and aldicarb 10 gave the best control. There was evidence in one experiment that diazinon, methoprene, and bendiocarb 5 G gave less control in Paygro 5-2-2 than in other media.