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Spearmint Go to: Peppermint (Mentha spp.) ...
Spinach (Spinacia oleracea)-Damping-off Cause Pythium spp. and Rhizoctonia solani are soil-infesting microbes that can build up rapidly and attack young germinating seedlings when soil is moist. Symptoms Stems are attacked as young plants emerge. Plants w ...
Spinach (Spinacia oleracea)-Downy Mildew By C.M. Ocamb and L.J. du Toit Cause Peronospora farinosa f. sp. spinaciae (formerly P. effusa), a fungus-like microorganism that overwinters on dead spinach plants, old plant debris, and volunteer spinach; it also ...
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Spinach (Spinacia oleracea)-Fusarium Wilt By L.J. du Toit and C.M. Ocamb Cause Fusarium oxysporum f. sp. spinaciae, a fungus that can survive many years in soil without a spinach crop. The fungus also can colonize roots of beet and Swiss chard plants, but ...
A spinach seed field with wide-spread plant die-out due to Fusarium wilt. Photo by Cynthia M. Ocamb, 2019.
Spinach (Spinacia oleracea)-Leaf Spot By L.J. du Toit and C.M. Ocamb See: Spinach (Spinacia oleracea)- Stemphylium Leaf Spot Cause A complex of fungi is associated with leaf spot disease on spinach, but Cladosporium variable is believed to be the primary ...
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Spinach (Spinacia oleracea)-Spinach Blight By L.J. du Toit and C.M. Ocamb Cause Cucumber mosaic virus (CMV), a pathogen spread by insects such as aphids and cucumber beetles and mechanically by cultivation and handling. CMV overwinters in seeds of wild cu ...
Spinach (Spinacia oleracea)-Stemphylium Leaf Spot By L.J. du Toit and C.M. Ocamb See: Spinach (Spinacia oleracea)- Leaf Spot Cause A fungus, Stemphylium botryosum f. sp. spinacia, first found in California in 1997, reported in Oregon, and found in spinach ...
Spinach (Spinacia oleracea)-Verticillium Wilt By L.J. du Toit and C.M. Ocamb Cause: Verticillium dahliae, a fungus that can survive many years in soil without a spinach crop. The fungus colonizes roots of spinach plants, from where it invades the vascular ...
Spinach (Spinacia oleracea)-White Rust Cause Albugo occidentalis, a fungus that is not uncommon on spinach but usually of minor importance. It also infects weedy species of Chenopodium. Warm days followed by cool, dew-forming nights favor disease. Symptom ...
Spinach (Spinacia oleracea)-Yellows Cause Beet western yellows virus, an increasingly significant pathogen in western Oregon. The principal vector is the green peach aphid, Myzus persicae; other aphid vectors are likely. After acquiring the virus from inf ...