Frequently Asked Questions
Q. What causes the lower leaves of my tomato plants to roll up?
A. Leaf roll (curling of the leaflets) is a physiological condition that occurs most commonly when plants
are trained and pruned. Any type of stress can cause leaf roll. It does not affect fruiting or quality, and it
is not a disease.
Q. What causes the flowers to drop off my tomato plants?
A. During unfavorable weather (night temperatures lower than 55 degrees F or above 72 degrees F and
day temperatures above 95 degrees F with dry, hot winds), tomatoes do not set fruit and the flowers
drop. The problem usually disappears as the weather improves.
Q. What causes the young leaves of my plants to become pointed and irregular in
shape? I noticed the twisting of the leaves and stems after spraying the plants for
the first time.
A. Your tomato plants have been injured by 2,4-D or a similar weed killer. Never use the same sprayer
for weed control in your vegetable garden you used on your lawn. Drift from herbicides originating one-
half mile or more away can also injure tomato plants. A virus disease called cucumber mosaic virus
(CMV) can mimic these symptoms.
Q. How often should my tomato plants be fertilized?
A. Fertilize the garden before planting tomatoes. Apply fertilizer again when fruit first sets. After the first
fruit sets, side-dress the plants with additional fertilizer every two weeks. Fertilize plants grown on
sandy soils more frequently than those grown on heavy clay soils. A general side-dress fertilizer
recommendation is 1 1/2 level tablespoons of a complete fertilizer (10-20-10 or 13-13-13) scattered
around the plant and worked into the soil.