Effect of soybean seed treatment with abamectin and thiabendazole on Heterodera glycines
Authors
A. J. Vitti
Du Pont do Brasil
U. da R. Rezende Neto
Louis Dreyfus Commodities Brasil S.A.
F. G. de Araujo
Escola de Agronomia, Universidade Federal de Goiás, Caixa Postal 131, 74690-900 Goiânia (GO), Brazil
L. de C. Santos
Escola de Agronomia, Universidade Federal de Goiás, Caixa Postal 131, 74690-900 Goiânia (GO), Brazil
K. A. G. Barbosa
Escola de Agronomia, Universidade Federal de Goiás, Caixa Postal 131, 74690-900 Goiânia (GO), Brazil
M. R. da Rocha
Escola de Agronomia, Universidade Federal de Goiás, Caixa Postal 131, 74690-900 Goiânia (GO), Brazil
Keywords:
chemical control, Glycine max, resistance, soybean cyst nematode
Abstract
The option of chemical control of the soybean cyst nematode (SCN) with traditional nematicides has been unviable, but seed treatment nematicides could be an important tool for management. Abamectin applied at 0, 30, 40, and 50 g ha-1 as a seed treatment together with or without thiabendazole at 20 g ha-1 was studied on a SCN resistant and a susceptible soybean cultivar. Abamectin treatment reduced the population density of females and cysts on the susceptible cultivar BRSGO Luziânia. For combined seed treatments, thiabendazole and abamectin should only be associated at concentrations of abamectin above 40 g ha-1. Combinations at lower rates or thiabendazole without abamectin resulted in a nematode population increase. The resistant cultivar BRSGO Ipameri yielded the highest, but seed treatment had no effect on yield.
