|
|
AVRDC International
Cooperators'
Fact Sheet |
|
Tomato
Diseases Most severe in tropical and subtropical climates with high rainfall |
|
|
Damage Symptoms This disease occurs in scattered plants or groups of plants. The initial symptom is wilting of terminal leaves, followed in 2-3 days by a sudden and permanent wilt. Adventitious roots may develop on the main stems. Additional symptoms include vascular browning, water soaking of pith followed by browning, and in later stages browning of cortex near the soil line. Bacteria streaming can be seen when a freshly cut stem is suspended in water.
The pathogen survives in soil for extended periods without a host plant. It enters roots through wounds, which may be caused by insects, nematodes, and cultivation. High temperature and high soil moisture favor disease development. |
|
||||||
|
Control No effective chemical control. Use disease-free transplants. When producing transplants, pasteurize the soil or fumigate the plant beds. Rotation with non-susceptible crops has limited value, although rotation with flooded rice reduces the incidence of disease. Tolerant cultivars may allow for 70-80% survival. Use raised beds for good drainage. Keep soil pH at 5.5 or higher. Avoid nematode-infested fields. |
|
Last updated: 2001. Information from: Vegetable Diseases: A Practical Guide. Lowell L. Black, AVRDC; and AVRDC International Cooperators's Guide on Suggested Cultural Practices for Tomato. |
|
|