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Tomato (Solanum lycopersicum)-Nematode, Root-knot March 2023 See: Tomato Varietal Resistance Cause Meloidogyne hapla, a sedentary endoparasite. Only second-stage juveniles (the infective stage) and adult males (which may be rare) are in soil. Root-knot ne ...

Tomato (Solanum lycopersicum)-Physiological Leafroll March 2023 Cause A physiological response by tomato plants to fairly extreme changes in soil moisture levels is thought to be associated with physiological leafroll. Prolonged dry soil conditions, high ...

Tomato (Solanum lycopersicum)-Powdery Mildew March 2023 Cause The fungi, Leveillula taurica (syn. = Oidiopsis taurica, Erysiphe taurica) and Oidium neolycopersici (syn. = Pseudoidium neolycopersici), are both occurring on tomato in western Oregon. Oidium ...

Tomato (Solanum lycopersicum)-Tomato Spotted Wilt March 2023 See: Greenhouse Plants, Ornamental- Impatiens Necrotic Spot Cause The Tomato spotted wilt virus, which is transmitted from plant to plant by thrips (an insect). This and the closely related Impa ...

Tomato (Solanum lycopersicum)-Tomato Yellow Leaf Curl March 2023 Cause The Tomato yellow leaf curl virus was found in California during 2007 and is transmitted by adult silverleaf whiteflies, but not by seed. This viral disease has not been reported in th ...

Tomato (Solanum lycopersicum)-White Mold March 2023 Cause A fungus, Sclerotinia sclerotiorum, that attacks numerous other hosts and overwinters as hard, black sclerotia in soil and plant debris. The fungus colonizes any organic debris such as old leaves, ...

Tomato (Solanum lycopersicum)-Verticillium Wilt March 2023 See: Tomato (Solanum lycopersicum)- Fusarium Foot Rot (Fusarium wilt) Tomato Varietal Resistance Cause Verticillium dahliae, a fungus that survives in soil and cause wilt symptoms. Verticillium su ...

Tulip-Break March 2023 Cause Break is a disease name for any of several viruses including Tulip breaking virus, Tulip band-breaking virus, Tulip top-breaking virus, Rembrandt tulip-breaking virus and Lily mottle virus. Each is in the potyvirus group and i ...

Tulip-Crown Rot March 2023 Cause Sclerotium delphinii, a fungus that can survive many years in soil as sclerotia. Infection usually occurs on the stems near the soil surface. A low percentage of sclerotia survived after only a month in the soil when dried ...

Tulip-Fire March 2023 Cause Botrytis tulipae, a fungus that overwinters as sclerotia in soil, affected bulbs, and diseased plant residue. Germination of sclerotia and infection of emerging shoots is greatest when soil is 41°F. Flowers are very susceptible ...