Choose plants that fit the site. Improper site selection and planting practices are major causes of plant failure. Know the weaknesses and strengths of plant materials and consider these in your landscape design and site selection. Mixed plantings of unrelated plants often are helpful in slowing the progression of certain diseases. Keep plants healthy.
Weak plants are more susceptible to certain diseases.
Maintain plant health through proper irrigation, fertilization, pruning, and mulching. Each year, remove diseased leaves and dead plant parts. Control insect pests. Certain insects, including aphids and leafhoppers, are carriers of viruses and mycoplasma-like organisms. Insects also may indirectly increase diseases by weakening plants.