Friday, April 18, 2014

Home News Don‘t mistake oedema for disease, insect symptoms

Don‘t mistake oedema for disease, insect symptoms

Pests & Diseases

Cool, cloudy weather promotes physiological disorder on some plants

David Kuack | May 16, 2011

Oedema can be a problem on plants during periods of cool and cloudy weather, reports Univ. of Md. Extension personnel. Symptoms appear as corky, tan spots on foliage. Geraniums, begonias, kalanchoes and begonias are usually the plants most often affected, but any broadleaved plant is susceptible. The cause is plants take in water faster than they can use it resulting in some plant cells to rupture.
Univ. of Mass. Extension floriculture specialist Tina Smith said do not over water plants, and keep the growing medium on the “dry side” during extended periods of low light and cool temperatures. Reducing humidity, by venting the greenhouse, also helps to control the disorder.
 

Top news

Research could produce a new generation of high-yield plants

Research from the University of Warwick is altering the understanding of plant development, and could lead to a new generation of high-yield plants.

Historic San Francisco greenhouse may remain open

The historic Portola neighborhood greenhouse may be saved from redevelopment.

Iowa greenhouse utilizes industrial heat

A Fairfield, Iowa, greenhouse is borrowing heat from an industrial neighbor to grow veggies.

Nexus adds Hess to sales team

Michael Hess joins the Nexus sales team.

Companion Biological Fungicide gets new packaging

The Growth Products fungicide has a new royal blue package that is now more durable.