Yellowing tomato leaves
Tomato None Given
We have 4 tomato plants and they started to slowly die. The first plant that died started to have yellowing leaves and within days the whole 4 foot plant was dead. Now we're noticing our other plants facing the same fate. 1. What is happening to them? 2. Can we stop it? 3. How do I stop this from happening to next years crops?
Posted
by: Molly
(1 point)
Posted: July 12, 2016
Answers
The yellowing and dying of tomato plants may occur due to following pathogens
1. Bacterial wilt disease caused by Ralstonia solanacearum
2. Crown and root rot caused by Fusarium oxysporum f. sp. radicis-lycopersici
3. Fusarium wilt caused by Fusarium oxysporum
4. Root knot nematode caused by Meloidogyne species
It is very important to know the exact causal organism to recommend any control measures. To diagnose further please perform the following tests and let us know.
a. You have to perform the ooze test to know if it is a bacterial wilt or not. Cut the tomato stem near the base and immerse it in a glass of water to see if any white substance oozes out form it (image attached for your reference).
b. Is yellowing one sided or whole plant turning yellow?
c. Is there any discoloration in vascular tissue? Longitudinally cut open the stem from the base to upwards to see any change in color (browning of vascular tissue).
d. Uproot the plants and check the roots for any swellings (galls) or rotting.
1. Bacterial wilt disease caused by Ralstonia solanacearum
2. Crown and root rot caused by Fusarium oxysporum f. sp. radicis-lycopersici
3. Fusarium wilt caused by Fusarium oxysporum
4. Root knot nematode caused by Meloidogyne species
It is very important to know the exact causal organism to recommend any control measures. To diagnose further please perform the following tests and let us know.
a. You have to perform the ooze test to know if it is a bacterial wilt or not. Cut the tomato stem near the base and immerse it in a glass of water to see if any white substance oozes out form it (image attached for your reference).
b. Is yellowing one sided or whole plant turning yellow?
c. Is there any discoloration in vascular tissue? Longitudinally cut open the stem from the base to upwards to see any change in color (browning of vascular tissue).
d. Uproot the plants and check the roots for any swellings (galls) or rotting.
ooze test
Stem surface near crown region become brown and roots are brown and rotting due to fusarium crown and root rot disease
Root knot nematode infected tomato plant
Fusarium Crown and Root Rot on Tomato Plant
Fusarium Wilt on tomato
Appearance of knots or galls on the roots of tomato plant (right ) compare to healthy roots (left)
Brown vascular tissue in stem from crown to slightly above due to fusarium crown and root rot disease.
Cut stem with fusarium wilt
Posted
by: Dr. Ravishankar Narayana
(15 points)
Posted: July 12, 2016
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