by Beutel J.A, Micke W.C, Kasimatis A.N, Bethell R.S
Published in Leaflet - Div. of Agricultural Sciences (1976)

by Micke, W.C, Yeager, J.T, Vossen, P.M, Bethell, R.S, Foott, J.H, Tyler, R.H
Published in California agriculture (Berkeley, Calif.) (01.03.1992)

by Griggs,W.H, Iwakiri,B.T, Bethell,R.S
Published in California Agriciculture (1965)

by Bethell, R.S, Falcon, L.A, Batiste, W.C, Morehead, G.W, Delfino, E.P
Published in Calif Agr (1972)

by Veerkamp, G.E, Logan, R.S, Standiford, R, Bethell, R.S, Irving, D.M, Farnham, D.S
Published in Leaflet - University of California, Cooperative Extension Service (USA) (1991)

by Riedl, H, Westigard, P.H, Bethell, R.S, DeTar, J.E
Published in California agriculture (Berkeley, Calif.) (01.09.1981)

by Bethell R.S, Ogawa J.M, English W.H, Hansen R.R, Manji B.T, Schick F.J
Published in California Agriculture (1977)

by Micke, W.C. (U.C., Davis), Yeager, J.T, Vossen, P.M, Bethell, R.S, Foott, J.H, Tyler, R.H
Published in California grower (USA) (01.06.1992)