Bacterial Canker, tomato
Photo: Dr. Wayne Nishijima
Tomatoes afflicted with bacterial canker show lower leaves that wilt and dry up while still attached to the plant. Vascular tissue is discolored and yellow slime can be squeezed from the stems.
Symptoms include wilting and cankers on both stems and fruits. A canker is a sunken, necrotic lesion.
Bacterial Canker, stem
Photo: Dr. Wayne Nishijima
This disease is seed borne, so it is important to use disease free seed. It can also be soil borne, so soil in infected areas should be sterilized. Because Bacterial canker can remain in the soil for years, we recommend that you rotate crops, practice good sanitation, and use disease-resistant varieties. Avoid mechanical damage to plants to prevent possible spread of the bacterium as well.
Contaminated seed may be treated in the following way, according to CTAHR (see Farmer’s Bookshelf):
Kendal Lyon, Hawaii Island Master Gardeners