Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 1 Weed Control.

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Presentation transcript:

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 1 Weed Control

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 2 Weed Prevention Prevention is always better than cure –to avoid weeds getting hold making adjustments to the way you garden –adopt new techniques Planting grow plants closer together to avoid leaving bare soil Digging avoid turning over the soil Watering avoid wetting large areas of soil

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 3 Weed Prevention Crop Rotation Use crop rotation which alternates different crops can help you keep weeds under control Crops differ in their ability to compete with weeds

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 4 Weed Prevention Stale Seedbed Here an area of ground is prepared two to three weeks in advance of sowing This allows a flush of weeds to germinate these can then be either hoed off or burnt using a flame thrower This can be used when sowing a lawn or slow germinating crops e.g. carrots or parsnips

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 5 Prevent Path and Patio Weeds Weeds under a hard surface will grow up and out from into the surrounding area To avoid prepare the ground well Use a weed-proof membrane Ensure gaps in paving are filled in with sand or cement

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 6 Weed Prevention Quick Start Use transplants rather than sowing gives plants a head start over any weeds. This also gives you time to use a stale seed bed Using transplants avoids confusion between weed seedlings and sown plants

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 7 Weed Control Hand-weeding Hoeing Thermal weeding

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 8 Chemical Control Contact Herbicides Kills only the plant material that they touch Usually sprayed to runoff May be highly toxic to a range of plants Usually characterized by a low persistence rate in the environment

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 9 Translocated Herbicides Applied to the plants outer surface May take some time to effect control Action kills all plant parts Usually has a low persistence in the environment

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 10 Residual Herbicides Applied directly to the soil surface Form a persistent layer in the top layer of the soil Kills weed seedlings as they emerge through this layer Long term solution to emergent weed seedling problem.

Tuesday 27th April 2010RHS Level 2 Certificate in Horticulture 11 Sources of Information See the following web site for an up to date list of available weed killers for amateur gardeners The Royal Horticultural Society a eddbf8.pdf