Most “sick tree” problems can be traced back to underlying stresses that have reduced the tree's vigor, making it more vulnerable to diseases or insect pests.
Mechanical and physical controls are among the most fascinating components of an integrated pest management program. This arsenal involves numerous physical barriers, traps, nets and other mechanical devices.
In integrated pest management, biological controls might include predatory or parasitic insects, bacteria or fungi, and biopesticides. More and more biocontrol methods are becoming available to the home gardener.