Tomato Pith Necrosis - LSU AgCenter Pith Necrosis Pseudomonas corrugata Roberts & Scarlet Tomato...
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Tomato Pith Necrosis Pseudomonas corrugata Roberts & Scarlet Tomato pith necrosis, caused by Pseudomonas corrugata and other soilborne species of Pseudomonas, has been observed sporadically throughout Louisiana since it was first observed here in 1983. The disease generally occurs on early planted tomatoes when the night tempera- tures are cool, the humidity is high, and plants are growing too rapidly because excessive nitrogen has been applied. Once the weather warms up, the plants tend to be able to outgrow the problem. The disease occurs randomly within fields, and initial symptoms are usually observed at the time the first fruit clusters reach the mature green stage. These symptoms generally consist of yellowing (or chlorosis) of young leaves fol- lowed by chlorosis and wilting of infected shoots in the upper part of the plant canopy. This wilting is usually associated with internal browning (or necrosis) of the basal portion of the stem. Dry, gray to brown to black lesions are also observed on petioles and stems, which may shrink, crack or collapse. The pith of symptomatic stems is hollow or may appear to contain distinct chambers and often exhibits a dark discoloration. Additionally, adventitious shoots often develop profusely on the affected stems. The only means of managing this disease is to avoid the use of excessive amounts of nitrogen, particularly early in the season when nights are still cool. Fig. 2. Dry necrotic lesions and adventitious root formation on tomato stems with pith necrosis. Fig. 1. Chlorosis and wilting of shoots associated with tomato pith necrosis. Author Donald M. Ferrin, PhD Extension Plant Pathologist, Horticulture Department of Plant Pathology and Crop Physiology Photo Credits Denyse Cummins Extension Horticulture Agent Northwest Region Louisiana State University Agricultural Center William B. Richardson, Chancellor Louisiana Agricultural Experiment Station David J. Boethel,Vice Chancellor and Director Louisiana Cooperative Extension Service Paul D. Coreil,Vice Chancellor and Director Pub. 3051 (online only) 4/08 Issued in furtherance of Cooperative Extension work, Acts of Congress of May 8 and June 30, 1914, in cooperation with the United States Department of Agriculture. The Louisiana Cooperative Extension Service provides equal opportunities in programs and employment.
Transcript of Tomato Pith Necrosis - LSU AgCenter Pith Necrosis Pseudomonas corrugata Roberts & Scarlet Tomato...
Tomato Pith NecrosisPseudomonas corrugata Roberts & Scarlet
Tomato pith necrosis, caused by Pseudomonas corrugata and other soilborne species of Pseudomonas, has been observed sporadically throughout Louisiana since it was first observed here in 1983. The disease generally occurs on early planted tomatoes when the night tempera-tures are cool, the humidity is high, and plants are growing too rapidly because excessive nitrogen has been applied. Once the weather warms up, the plants tend to be able to outgrow the problem.
The disease occurs randomly within fields, and initial symptoms are usually observed at the time the first fruit clusters reach the mature green stage. These symptoms generally consist of yellowing (or chlorosis) of young leaves fol-lowed by chlorosis and wilting of infected shoots in the upper part of the plant canopy. This wilting is usually associated with internal browning (or necrosis) of the basal portion of the stem. Dry, gray to brown to black lesions are also observed on petioles and stems, which may shrink, crack or collapse. The pith of symptomatic stems is hollow or may appear to contain distinct chambers and often exhibits a dark discoloration. Additionally, adventitious shoots often develop profusely on the affected stems.
The only means of managing this disease is to avoid the use of excessive amounts of nitrogen, particularly early in the season when nights are still cool.
Fig. 2. Dry necrotic lesions and adventitious root formation on tomato stems with pith necrosis.
Fig. 1. Chlorosis and wilting of shoots associated with tomato pith necrosis.
AuthorDonald M. Ferrin, PhD
Extension Plant Pathologist, HorticultureDepartment of Plant Pathology and Crop Physiology
Photo CreditsDenyse Cummins
Extension Horticulture AgentNorthwest Region
Louisiana State University Agricultural CenterWilliam B. Richardson, Chancellor
Louisiana Agricultural Experiment StationDavid J. Boethel, Vice Chancellor and DirectorLouisiana Cooperative Extension Service
Paul D. Coreil, Vice Chancellor and Director Pub. 3051 (online only) 4/08
Issued in furtherance of Cooperative Extension work, Acts of Congress of May 8 and June 30, 1914, in cooperation with the United States Department of Agriculture. The Louisiana
Cooperative Extension Service provides equal opportunities in programs and employment.
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