1. A. Dangerously Injurious Plant Pests.

   1. (1) A stop sale notice may be issued when any plant pest of quarantine significance is detected or is a plant pest that is not known to occur in the State.

   2. (2) Insects. A stop-sale notice may be issued when the following insects are detected:

      1. (a) Stem and trunk borers such as Dogwood, Ash, Lilac, Iris, Rhododendron, Lesser peach tree, Bronze birch, and peach tree;
      2. (b) Scale insects, such as Euonymus, Elongate hemlock, Hemlock, Pit, Obscure, Japanese maple, Latania, Camellia, Oystershell, San Jose, Tea, White peach, Yangicola;
      3. (c) Beetles, such as Whitefringed, Black vine weevil, Fullers rose beetle, White pine weevil;
      4. (d) Caterpillars such as Gypsy moth;
      5. (e) Gall adelgids such as Eastern spruce;
      6. (f) Leafminers, such as Boxwood;

   3. (3) Plant Diseases. A stop-sale notice may be issued when the following plant diseases are detected:

      1. (a) Vascular wilt diseases, such as Dutch elm disease, Oak wilt, Verticillium wilt, Mimosa wilt, Phytophthora wilt, Elm phloem necrosis;
      2. (b) Canker diseases, such as Chestnut blight, Nectria cankers, Botryosphaeria cankers, Cytospora cankers, White pine blister rust, Phytophthora cankers, Fusarium cankers, Strumella cankers, Volutella cankers, Phomopsis cankers, Discula anthracnose of dogwood;
      3. (c) Bacterial diseases, such as Crown gall, Fire blight, Wetwood (Slime-flux);
      4. (d) Galls, such as Rust galls on Pinus spp., Black knot on Prunus spp., Cedar-apple rust galls on Juniperus spp., Crown gall, Root-knot nematode;
      5. (e) Plants infected with viruses or phytoplasms, such as Holly ringspot, Rose mosaic, Rose ring pattern, Stem pitting of Prunus, Fasciation, Witches'-broom Tospoviruses;
      6. (f) Root diseases, such as Armillaria root rot (Shoestring root rot); Phytophthora, Pythium, Rhizoctonia, and Fusarium root rots; Damping-off; Wilts; Root-knot, cyst, and other plant parasitic nematodes;
      7. (g) Needle blight, needle cast, and needle rust diseases of evergreens, such as Diplodia tip blight, Phomopsis blight, Brown spot needle blight, Lophodermium needle cast, Rhabdocline needle cast, Coleosporium needle rust;
      8. (h) Gymnosporangium rusts, such as Hawthorn, and Cedar-apple;
      9. (i) Any other disease or abnormal condition of growth determined by the Department to be dangerously injurious to plants.
   4. (4) Weeds. A stop-sale notice may be issued when the following weeds are detected infesting the soil known as the root ball: Mugwort, Bermudagrass, Dodder, Johnsongrass, Poison ivy, Thistles, Witchweed, Mile-a-Minute, or any other weed determined by the Department to be dangerously injurious.

2. B. Harmful Plant Pests.

   1. (1) Insects. A treatment order may be issued when the following insects constitute a serious threat or are causing economic damage to nursery stock:

      1. (a) Scale insects, such as Gloomy, Putnam, Scurfey, Wax, Magnolia, Tulip trees, Peony;
      2. (b) Caterpillars, such as Bagworm, European pine shoot moth, Nantucket pine tip moth;
      3. (c) Lace bugs, such as Azalea, Andromeda, Hawthorn;
      4. (d) Adelgids, such as pine bark;
      5. (e) Leafminers, such as Holly;
      6. (f) Mites, such as Twospotted spider, Spruce spider, Southern red;
      7. (g) Beetles, such as Japanese, Japanese Weevil, and
      8. (h) Aphids.
   2. (2) Diseases. A treatment order may be issued when the following diseases or disorders constitute a serious threat or are causing economic damage to nursery stock: Foliar and flower diseases, such as Anthracnose, Powdery mildew, Leaf spots, Botrytis blight, Scab, Sooty mold, Leaf blister, Petal and flower blights, nutritional problems.
   3. (3) Weeds. A treatment order may be issued when the following weeds are detected in a nursery or sales yard: Mugwort, Dodder, Johnsongrass, Yellow Nutsedge, Thistle, or any other weed determined by the Department to be harmful.

Authority: Agriculture Article, §§5-301—5-314 and 9-302, Annotated Code of Maryland

Effective date: January 13, 1978 (5:1 Md. R. 19)

Regulations .01B, J; .06; .07A, C; .12A; and .16 amended effective February

10, 1986 (13:3 Md. R. 273)

Regulation .06 amended effective August 3, 1992 (19:15 Md. R. 1393)

Chapter revised effective October 2, 2000 (27:19 Md. R. 1728)

Regulation .06B amended effective October 27, 2025 (52:21 Md. R. 1025)

Regulation .06B, C amended effective August 9, 2010 (37:16 Md. R. 1060)

Regulation .06C amended effective April 13, 2026 (53:7 Md. R 328)