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.

Drought Information

The drought this summer has been a challenge for some growers. Many towns have water bans and some towns have discouraged new plantings. Some retailers have reported that the hot, dry weather has also reduced demand for plants. Depending upon the water source, another consequence of the drought may be the quality of water being used for irrigation. Equipment clogged with sediment (surface water), or high salt (Na and Cl) concentration in irrigation water due to low water levels are possible considerations.   

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.


Light and temperature extremes this time of year can stress plants in greenhouses and retail yards. Tender new growth and plants under water stress are particularly prone.

Faded, dull upper surfaces of most recently expanded leaves are often the beginning signs of sunscald. Sunscald -paper thin brown spots can occur on tender new growth and when cloudy weather is followed by bright sun and high temperatures. In greenhouses, shade cloth may be needed for some crops.

Garden Mums, Flowering Cabbage and Kale - Irrigation and Hot Temperatures

Production areas with black fiber cloth were hot, hot, hot this week. Garden mums, flowering cabbage and kale may exhibit signs of wilting during extended periods of 90 plus degree temperatures. The solution may not be as easy as turning on the irrigation. Plants wilt when the soil is dry, but wilting will also occur in hot weather which may cause plants to be stressed, or if the roots are damage from a root disease such as Pythium, even if the soil is saturated with water. When the roots stop functioning the plants will show signs of stress by wilting.


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