1. Soil Science Department Federal University of Rio Grande do Sul 7712 Bento Gonçalves Avenue Porto Alegre Rio Grande do Sul 91540000 Brazil
2. Estrada Silval Capivari do Sul Rio Grande do Sul 95552000 Brazil
3. Department of Entomology University of Nebraska–Lincoln 1700 E Campus Mall Lincoln NE 68583 USA
4. Forage Plants and Agrometeorology Department Federal University of Rio Grande do Sul 7712 Bento Gonçalves Avenue Porto Alegre Rio Grande do Sul 91540000 Brazil