Cultural Problems

Poinsettia - Enations

This photo was submitted by a grower the first week of October. It shows leaf-like enations, ruffled leaf tissue that appear on the interveinal leaf tissue on the underside of the leaf.

It has been reported that enations on poinsettias are usually the result of airflow across the leaf surface during periods of high heat. It is thought that high heat during August may have been the cause on a few plants in this case.

Pepper - Blossom End Rot

Growers are familiar with blossom end rot on greenhouse tomatoes but it can also affect greenhouse peppers.  Water soaked spots which later turn brown or black and become sunken and dry appear at or near the blossom end of the fruit. Avoid unneccesary stress on plants by uniform, regular watering  so that calcium can be translocated during fruiting.

Cold Temperature Injury on Cuttings

Poor rooting of cuttings due to cold temperature damage.

Frigid temperatures and frequent snow storms are a challenge during winter months for growers receiving shipments of plugs and cuttings for spring production. Deliveries may be delayed due to snow storms and plants are at risk of arriving chilled or frozen. Symptoms of freezing or chilling damage include water-soaked or translucent leaves and stems. The damage often shows up within a few hours after exposure to warmer temperatures.

Tomatoes - Leaf roll

Leaf roll on tomatoes is not caused by disease and does not affect yield or fruit quality. Curled or rolled leaves is a physiological disorder of tomatoes that is often associated with hot dry weather or wind, however it can also occur in response to other stresses like high moisture and nitrogen, fast growth, heavy production, pruning and root damage. Symptoms of leaf roll appear on lower leaves first, when the leaves roll upward and sometimes overlap. Affected leaves are rigid and have a leathery texture.

Soluble Salt Injury - Spinach Transplants

Two photos of spinach plants in organic growing media. The compost mix (from the bag) tested high soluble salts (3.4 mS/cm) and ammonium (64). Spinach plants on showing symptoms of high soluble salts are stunted, yellowed and have burned leaf tips. Plants were also bottom watered with additional organic fertilizer. Notice the soluble salt build-up on the media surface. The spinach plants in the second photo are the same plants after a week of watering with clear water from the top and letting water drain through, leaching out the soluble salts.

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