APPLICATION OF A SEX-PHEROMONE, PHEROMONE ANALOGS, AND VERTICILLIUM-LECANII FOR MANAGEMENT OF HETERODERA-GLYCINES

A mutant strain of the fungus Verticillium lecanii and selected bioreg ulators of Heterodera glycines were evaluated for their potential to r educe population densities of the nematode on soybean under greenhouse conditions. The bioregulators tested were the H. glycines sex pheromo ne vanillic acid and the pheromone analogs syringic acid, isovanillic acid, ferulic acid, 4-hydroxy-3-methoxybenzonitrile, and methyl vanill ate. A V. lecanii-vanillic acid combination and a V. lecanii-syringic acid combination were also applied as treatments. Syringic acid, 4-hyd roxy-3-methoxybenzonitrile, V. lecanii, V. lecanii-vanillic acid, and V. lecanii-syringic acid significantly reduced nematode population den sities in the greenhouse tests. Results with vanillic acid, isovanilli c acid, and ferulic acid treatments were variable. Methyl vanillate di d not significantly reduce cyst nematode population densities in the g reenhouse tests.