Grains and field crops
All trials were located in Merredin.
This trial was one of the best demonstrations of pursuits effectiveness against mustard in particular. Other weeds were rough poppy and ryegrass and a small amount of cereal and doublegee.
250 ml applied immediate before seeding (IBS) was by far the best treatment with 100% control of mustard and poppy and good ryegrass control. This is in contract to 375 ml most emergent which had good control of mustard (77%) and suppression of ryegrass. There was no yield advantage from the post emergent treatment but there was a 55% yield increase from the IBS treatment.
This trial had three treatments 250 ml/ha IAS and two rates of post emergent spraying. There was good control of capeweed, radish, turnip and ryegrass and suppression of doublegee and cereals. The suppression of doublegee however was not long lasting and six weeks after spraying, the doublegee was showing signs of recovery.
At the time of setting up this trial it was unknown that the area selected had in the previous year been a site for testing Logran's effectiveness on wild oats, so there were two densities of wild oats across the trial. This is shown by the plant counts where the Nil has only 9..3 wild oats/m2 while some of the other treatments have from 40-50 wild oats/m2. However, by counting plant densities outside the trial , it could be seen there was a significant reduction in the number of wild oats growing - 40-50 versus 114 plants/m2. By harvest time it was obvious that pursuit is very strong wild oats with all plots where pursuit was sprayed after seeding showing almost total wild oat control. The plot sprayed post emergent had a low level of wild oats present but still achieved good control.
Volunteer wheat and ryegrass were the only weeds to germinate on this site. There was suppression of both weeds by IBS was by far the better treatment. This was obvious only in plant counts early on (60% reduction in ryegrass) but not in appearances. By harvest however, the effect of the grasses was very obvious.
Peas were sown on the 19/5 and completely windblown on 2/6. It was not until the 14/6 that the peas re-emerged. It was assumed that the wind would have removed most of the pursuit but there was still an obvious effect. No counts were done bu the main weed present was mustard of which there was good control in both the IBS and IAS treatments.
Mustard and wild oats were the main weeds on this site and control was total for both with IBS and IAS treatments. The post emergent treatment was slightly weaker on the wild oats than the other treatments but there where the IBS and IAS treatments gave total control, the PEM still had some plants remaining which were stunted and suppressed but would still set viable seed.
Number of Pages
Curtin, S. (1990), Pursuit for weed control in peas.. Department of Agriculture and Food, Western Australia, Perth. Report.