Another Trouble Afoot – Leaf Curl/Roll

We have been having huge shifts in temperature lately. From 80’s to the 50’s and lots and lots of rain. Our tomatoes are reacting to these changes on an individual basis. some of my varieties, actually most of them, are doing well. A couple have leaf spots (I’ll do a separate post of that at a later date), my “Cougar Red” has some curled, rolled leaves (other than that it is healthy). I have done some research on the latter and this is what I’ve found:

“Leaf Roll:

During very wet seasons, tomato plants frequently show an upward rolling of the leaflets of the older leaves. At first this rolling gives the leaflet a cupped appearance. Later, the margins of the leaflets touch or overlap. The rolled leaves are firm and leathery to the touch. One half to three-fourths of the foliage may be affected. Plant growth is not noticeably checked, and a normal crop of fruit is produced. Frequently leaf roll occurs when tomato plants are pruned severely, and it is very common when unusually heavy rains cause the soil to remain moist for long periods of time.

To prevent leaf roll, keep tomato plants on well-drained, well-aerated soil, and protect them from prolonged periods of heavy rainfall if you can.”

Also this: (Univ. of Colo.)

“Leaf roll, or leaf curl, is a physiologic distortion that may develop with periods of cool, rainy weather. It cause the lower leaves to roll upward and become thick and leathery. Leaf roll does not affect plant growth or fruit production and requires no treatment.

Leaf Roll

Herbicides can distort the foliage and fruit of tomatoes. They are especially sensitive to 2,4-D. Damage can bend the leaves down, causing cupping and thickening. New leaves are narrow and twisted and do not fully expand. Fruit may be catfaced and fail to ripen. Exposure can occur when herbicides are applied to lawns for weed control and the spray “drifts”. Resultant fumes can also effect the plants for several days after treatment. Clippings from grass that has been sprayed with a herbicide should not be used as mulch in the vegetable garden. If the exposure is minimal, the plant will outgrow the injury. Be sure to water the affected plants thoroughly and often.”

I guess I will have to wait and see how they turn out. In the meantime, the “Cougar Red” is in it’s own pot and segregated to be on the safe side.

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