Herbicide is transferred from the wiping surface to the target plants. Materials used for blankets vary widely and include hessian bags, felt and car upholstery fabric. Advantages Increased operator and environmental safety, because there is no spray drift, unlike conventional sprayers. Less herbicide is wasted on non target plants, because it is only applied to taller weeds. Critical times of herbicide application are not lost due to unfavourable windy conditions.
Homemade units are cheap and simple to construct.
Units can be mounted on the front or rear of a vehicle or towed behind the vehicle. Blanket wipers are uncomplicated and easy to use. They are light, robust and have few moving parts that require servicing. Blankets are easy to clean and replace, if necessary. Figure 2 One-leaf cape tulip at York in the season following treatment with blanket wiper Disadvantages Dense weed infestations may require a double pass from two directions at slower speeds to ensure sufficient chemical coverage.