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Performance of granular collectors for container plants and a comparison of the influence of canopy type on preemergent herbicide deposits
- DERKSEN, R. C., ALTLAND, J. E., OLIVEIRA, R. E., OZKAN, H. E.
- Applied engineering in agriculture 2014 v.30 no.3 pp. 383-389
- Buddleja davidii, Hydrangea macrophylla, bottles, canopy, clay, collectors, container-grown plants, glass, granules, herbicides, pesticide application, shrubs, weed control, weeds
- Preemergent herbicides are commonly used to manage weeds in nurseries that produce container-grown plants. Granular products are applied over the top of a canopy, and must pass through the canopy, to reach the substrate where weed control is needed. Little guidance is available on methods for measuring the distribution of clay herbicide granules reaching the surface of a container pot substrate. A study was conducted to evaluate three different types of collectors including sticky tape, a Petri dish and a glass bottle. The glass bottle, sunken in the substrate, provided the most efficient collection of granules released from 76 cm above the substrate surface. The jar collectors were used to evaluate differences in deposits produced by an air-boom spreader in different sizes of butterfly bush (Buddleja davidii ‘Pink Delight’) and hydrangea (H. macrophylla ‘Niko Blue’) canopies. The hydrangea canopy significantly affected deposits more than the butterfly bush canopy but there was no significant difference in mean deposits on the substrate between the two plant species. The variability in granule deposits on the substrate increased with increasing hydrangea shrub size. The same variability was not observed in the butterfly bushes.