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Delphinium-Tomato Spotted Wilt March 2023 See: Greenhouse Plants, Ornamental- Impatiens Necrotic Spot Symptoms Pale green, circular, elliptical, or irregular areas that may become surrounded by chlorotic rings occur on leaves. On some leaves, numerous con ...

Dewberry Go to: Blackberry (Rubus spp.) ...

Dianthus (Sweet William)-Botrytis Blight March 2023 See: Greenhouse Plants, Ornamental- Gray Mold Carnation (Dianthus caryophyllus)- Gray Mold Chemical control Best when used with cultural controls. Tank-mix and/or alternate products from different groups ...

Dianthus (Sweet William)-Leaf Spots March 2023 See: Carnation (Dianthus caryophyllus)- Alternaria Blight Cause Septoria dianthi and Cladosporium echinulatum (sexual Mycosphaerella dianthi), fungi, have been found by the OSU Plant Clinic; Phyllosticta sp. ...

Dieffenbachia-Dasheen Mosaic March 2023 Cause Dasheen mosaic virus, a rod-shape potyvirus. It can be transmitted by aphids (nonpersistent), mechanically through infected sap, and by vegetative propagation. It infects many members of the Araceae family inc ...

Dill (Anethum graveolens)-Alternaria Leaf Spot March 2023 Cause Alternaria species. These fungi survive in residues of affected crops including carrot, parsley, celery, and parsnip; they also may be seedborne. Spores move by wind and water. Symptoms Seedl ...

Dill (Anethum graveolens)-Damping-off March 2023 Cause The soilborne fungi or fungus-like microorganisms, Fusarium spp., Pythium spp., and Rhizoctonia solani, may attack before, during, and after germination. In the Pacific Northwest, Pythium spp. are the ...

Dill (Anethum graveolens)-Sclerotinia Stem and Crown Rot March 2023 Cause Sclerotinia sclerotiorum is a fungus that overwinters as small black structures (sclerotia) attached to decomposing infected plant portions. Sclerotia may survive more than several ...

Dogwood (Cornus spp.)-Anthracnose March 2023 See: Dogwood (Cornus spp.)- Leaf Spots Cause Discula destructiva, (formerly Gloeosporium sp.), a fungus that overwinters on dead twigs and on leaves on the tree and ground. Tiny brown fruiting bodies (acervuli) ...

Dogwood (Cornus spp.)-Armillaria Root Rot See: Rose (Rosa spp.) and hybrids- Armillaria Root Rot ...