We had a problem with Spotted Wing Drosophila last year when we caught some in traps and noted damage in our raspberries. Today, I harvested some early berries and put them in a solution of 1 cup sugar in a quart of water. After 1/2 hour, Drosophila larvae floated to the surfact. According the "Biology, Identification and Management of Spotted Wing Drosophila" FSA7079 by Donn … [Read more...] about Testing for Drosophila larvae in raspberries