B NSW Agriculture, Agricultural Research Station, PMB, Narrabri, NSW 2390, Australia. R. T. Colton NSW Agriculture, Division of Plant Industries, Locked Bag 21, Orange, NSW 2800, Australia. First field testing was carried out at Narrabri at F5 in 1988-89 by I. A. Rose. Subsequent trials were conducted under coastal conditions in the Grafton area from 1989-90 by P. J. Desborough. Trochus has a determinate growth habit with strong upright bush development, purple flowers, brown pubescence, and brown pod walls.
Seeds are yellow, spherical, with a dull lustre.
Hila are black. Agronomic characteristics Trochus has been selected for late sowing in coastal soybean production areas, based mainly on superior yield, tolerance under field conditions to manganese toxicity, and delayed harvest weathering. Trochus has strong resistance to shattering and to lodging if sown at an appropriate date. Trochus is tolerant to bacterial pustule, bacterial blight, and downy mildew. Trochus extends the range of suitable sowing dates later into January for cultivars with good adaptability to coastal conditions.