Always use these general guidelines for submitting a greenhouse sample.

• Samples should be fresh.
• Samples should represent the early to middle stages of the problem.  A completely dead and decaying sample cannot be reliably diagnosed.
• Samples should be carefully packaged and shipped early in the week to avoid weekend layovers during which the sample will deteriorate.
• Be sure to include sample documentation and background information.  The specimen form can be downloaded from:  General Form
• Pictures of the problem in the field are always helpful.  The environmental conditions of the plant can play an important role in the diagnosis.