Publication Date

1990

Document Type

Report

DAFWA Collections

Grains and field crops

Abstract

Trial 90C49

Grass and broad leaved weed control in direct sown crops.

Location: Chapman Valley Research Station.

The low rate of sprayseed with diuron was not as effective on the grasses. It may indicate some antagonism within the mix as the same rate of sprayseed with metribuzin did not cause any drop in grass control. The addition of 2, 4-D amine may have boosted the mixes activity on capeweed as the sprayseed metribuzin mix was not very good on capeweed.

Trial 90EB37

Grass and broad leaved weed control in direct sown crops.

Location: East Beverley Annex.

Part of the trial site was affected by herbicides that washed onto the area from a chemical disposal site.

Trial 90WH70

Grass and broad leaved weed control in direct drilled crops.

Location: Wongan Hills Research Station.

Very low densities of weeds were recorded. Diuron at 1.5 L/ha suppressed ryegrass and radish when applied pre-emergence, as did metribuzin post-seeding/pre-emergence. Post-emergence applications of metribuzin were not as effective on ryegrass but did give a reduction in bromegrass. Logran and glean IBS were very poor on radish control. Stomp and metribuzin either alone or combined gave good control of bromegrass and ryegrass. Metribuzin was very effective against radish. Glean and logran reduced ryegrass densities by about 50% where only sprayseed was applied.

Trial 90KA123

Control of four o'clock (Oxalis purpurea L.) in cereals.

Location: Broomehill.

Four o'clock. Sprayseed 200 at 2.0 L/ha was the least effective herbicide treatment to reduce density. Roundup 0.5 L + Ally 5 g gave the best reduction of four o'clock where there was no further IBS or post-emergence herbicides applied.

Trial 89NO95

Effects of herbicides, cultivation and legume pasture on density of two species of Oxalis.

Location: Wougamine (Northam)

One year after the treatments were applied, both four o'clock and O. glabra densities were highest in the pasture that was undisturbed, i.e. no chemical, cultivation or clover treatments (table 12). Cultivation in the absence of chemicals significantly reduced the densities of both species and the densities were further reduced if the cultivation was followed by the establishment of a subterranean clover pasture.

To test the effectiveness of several chemicals for the control of patersons curse growing along roadsides.

Location: West Arrino

By waiting to apply treatments, it could almost be guaranteed that there would be no further germinations in that season.

In the case of patersons curse, once the plants had run up to flower they would be much easier to locate with their conspicuous blue flowers. Small rosettes of PC are very difficult to detect early in the season because they are smothered by the early germinating grasses.

Number of Pages

25

Keywords

Western Australia

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