Table 6.

Most common arthropod and disease problems encountered on street trees in the North Central region of the U.S., according to respondents in a survey conducted in 1982.

AnthropodsWeighted value
Lepidopterous defoliators14.71/
Borers11.7
Leaf beetles8.62/
Scales7.0
Aphids4.8
Bark beetles2.83/
Hackberry galls1.8
Spider mites1.5
Diseases
Dutch elm disease11.4
Anthracnose8.8
(Sycamore and others)
Verticillium wilt5.9
Fire blight4.0
Oak wilt1.9

  • ↵1/ Bagworm = 5.5; cankerworms = 4.5; eastern tent Caterpillar = 2.4; mimosa webworm = 1.5; others = 0.8.

  • ↵2/ Elm leaf beetle = 7.0; others = 1.6

  • ↵3/ Elm bark beetle = 2.6; others = 0.2.