December 7, 2005
What causes plant disease? Most people would answer this question by saying that plant pathogens, such as fungi or bacteria, cause plant disease. But this is only part of the answer. Plant pathologists talk about a combination of three crucial factors that must be present to have plant disease. These three factors are often referred to as the plant disease triangle.
Amaryllis are popular flowering bulbs which are forced indoors for their large, spectacular blooms during the winter months. The trumpet-shaped flowers can be as large as 8 to 10 inches across and are produced atop an 18- to 30-inch-tall flower stalk. Flower colors include red, pink, orange, salmon, white, and bicolors. Single-flowering, double-flowering, and miniature amaryllis varieties are available.