Seedling emergence responses in ryegrasses (Loliumspp.) to fungieide seed treatments

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Abstract
The effects of fungicide dust seed treatments on seedling emergence from 5 field soils of 8 ryegrass cultivars were investigated. The cultivars tested were diploid and tetraploid selections of L. perenne L., L. multiflorum Lam., and interspecific hybrids of these [L. perenne L. ''Grasslands Ruanui'', ''Grasslands Nui'', L. multiflorum Lam. ''Grasslands Paroa'', a tetraploid L. multiflorum Lam. ''Grasslands Tama'', L. (multiflorum .times. perenne) ''Grasslands Manawa'', L. (multiflorum .times. perenne) .times. perenne ''Grasslands Ariki'', ''Grasslands G4708'' and ''Grasslands G4709'' (both tetraploids)]. In glasshouse and field experiments, the fungicides captan, thiram and etridiazole, at 3.0 g a.i.[active ingredient]/kg seed, gave from 0 to > 150% increases in numbers of emerging seedlings, depending on cultivar, soil, temperature and age of seed. Benomyl had no effect on, or reduced, seedling emergence. The use of suitable fungicides as routine seed treatments for ryegrasses has great potential.

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