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Tulip-Fusarium Basal Rot March 2023 Cause Fusarium oxysporum f. sp. tulipae, a fungus that lives in soil and on plant debris. The disease became a problem with shorter rotations that favored buildup of inoculum. The disease is widespread but not as common ...

Tulip-Gray Bulb Rot March 2023 Cause Rhizoctonia tuliparum, a fungus that survives in the soil for at least 3 to 5 years as sclerotia. After 10 years there may still be 10% viable sclerotia. Sclerotia germinate and infect bulbs after planting or in the ve ...

Tulip-Penicillium Bulb Rot (Blue Mold) March 2023 See: Garlic (Allium sativum)- Blue Mold Rot Iris, Bulbous (Iris spp.)- Blue Mold Cause Various Penicillium spp., fungi. Penicillium hirsutum has been found on Iris in Washington. Both P. hirsutum and P. tu ...

Tulip Tree (Liriodendron tulipifera)-Verticillium Wilt See: Maple (Acer spp.)- Verticillium Wilt ...

Turf Diseases Go to: Lawn and Turf ...

Turnip and Rutabaga (Brassica spp.)-Black Leg (Phoma Dry Rot) March 2023 See: Seed Crop, Crucifers (Brassica, Eruca, and Raphanus spp.)- Black Leg By C. M. Ocamb Cause Plenodomus lingam (syn. Leptosphaeria maculans, anamorph: Phoma lingam) and Plenodomus ...

Turnip and Rutabaga (Brassica spp.)-Black Root Rot March 2023 See: Radish (Raphanus sativus)- Black Root Cause Aphanomyces raphani, a fungus-like microorganism that overwinters in soil and on diseased plant residue in soil. It invades the fine rootlets of ...

Turnip and Rutabaga (Brassica spp.)-Black Rot See: Cabbage and Cauliflower (Brassica oleracea)- Black Rot ...

Turnip and Rutabaga (Brassica spp.)-Boron Deficiency March 2023 Cause Deficiency or unavailability of boron in the soil and subsequent deficiency in the plant. All vegetables require boron for growth, but the amount required varies considerably. Turnip, r ...

Turnip and Rutabaga (Brassica spp.)-Clubroot March 2023 See: Cabbage and Cauliflower (Brassica sp.)- Clubroot By C. M. Ocamb Cause The disease is caused by Plasmodiophora brassicae. This obligate parasite has been considered a primitive fungus or slime mo ...