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This pesticide factsheet covers the use and characteristics of Dimension (dithiopyr).
When it comes to weeds, “start clean – stay clean” should be the moto of every nursery manager. This is especially true for producers of herbaceous perennials. Although we can control most grassy weeds with postemergence herbicide; otherwise, we have few herbicides to use when weeds get out of hand. Furthermore, the herbicides labeled for use in herbaceous ornamentals are either safe on many ornamentals and do not control many weeds, or control lots of weeds but are safe on only a few ornamentals. Consequently, to manage weeds effectively a comprehensive nursery weed management program including exclusion, sanitation, preemergence herbicides, some postemergence herbicides and hand weeding will be needed.
More than 40 sedge species may be found in North Carolina landscapes. Although grass-like in many ways, and the nutsedges are often referred to as “nutgrass”, they are not grasses and require different control measures than grasses. Sedges are easily distinguished from grasses by their leafy shoots that produce leaves in “3s” resulting in stems that are triangular in cross section. In contrast, shoots of grasses are flat or round in cross section.
This pesticide factsheet covers the use and characteristics of StriCore (pethoxamid).
This pesticide factsheet covers the use and characteristics of Gemini (isoxaben + prodiamine).
This pesticide factsheet covers the use and characteristics of Envoy Plus (clethodim).
Efficacy of preemergence herbicides labeled for use in nursery crops and landscape plantings
This pesticide factsheet covers the use and characteristics of Gallery (isoxaben).
Preemergence herbicide efficacy summary chart, Ranking the efficacy of preemergence herbicides on most weeds of nursery and landscape plantings.
This pesticide factsheet covers the use and characteristics of Regal O-O (oxyfluorfen + oxadiazon).
This table presents information on preemergence herbicides for herbaceous ornamentals.
Research has shown that up to 75% of the preemergence herbicides broadcast-applied to container nursery crops falls to the ground between the pots. As the size of the crop increases, the space between pots increases - -resulting in greater and greater percentages of the applied herbicide falling between pots. This factsheet covers how to apply preemergence herbicides to individual pots uniformly and accurately.
Various mulches, including fabric or organic disks, plastic pot-toppers, and organic mulches, have been investigated for weed control in containers. Advantages, disadvantages, and cost estimates, of using mulches in container nursery crops are presented.
This table presents information on preemergence herbicides registered for use on woody ornamentals.
