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Effect of a Systemic Insecticide on Forage and Grain Production of Wheat, Barley, Oat, and Rye Varieties¹

In experiments conducted at four locations for 2 years, soil applications at time of planting of 10% granules of the systemic insecticide disulfoton at the rate of 11.2 kg/ha had no effect on stand establishment of varieties of wheat, barley, rye, and oats.

Disulfoton treatment caused an increase in fall forage production of ‘Dayton’ barley, ‘Knox 62’ wheat, and possibly ‘Balbo’ rye, but no effect was found for ‘Kenbar’ barley, ‘Monoii‘ wheat, or ‘Blount,‘ ‘Forkedeer,‘ and ‘Le Conte‘ oats.

Disulfoton application had no effect on spring forage production, but grain yields were reduced in 26 of 37 comparisons for all crops. The reduction in grain yields were reduced In 26 of 37 comparisons for all crops. The reduction in grain yield was significant for Knox 62 wheat and Dayton and Kenbar barley. In treatments where no forage was harvested similar reductions in grain yield were found.

Key Words: disulfoton • organic phosphorus insecticide • growth enhancement

² Professor of Entomology and Assistant Professor of Agronomy (present address: Dept. of Agronomy, Univ. of California, Davis), respectively.

Received for publication November 1, 1967.