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UC IPM Home > Homes, Gardens, Landscapes, and Turf > Trees and Shrubs > Diseases
How to Manage Pests
Pests in Gardens and Landscapes
Pest identification and confirmation—Common leaf
spot diseases
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Fungal
scab
Olive green to black, circular, scabby or velvety spots appear on infected
leaves, which may yellow or redden and drop prematurely. Occurs on many hosts.
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Anthracnose
Anthracnose causes small spots on oaks and walnuts and larger spots on elm,
ash, birch, and redbud. Large angular areas occur on maple and sycamore.
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Entomosporium
Tiny reddish spots, sometimes surrounded by a yellow halo,
appear on leaves of infected plants. Spots darken and enlarge
as the leaves mature. Cream-colored specks with a glossy
membrane eventually appear in the center of the spots. Affects
rose family plants, including pome fruits. |
Shot hole
Reddish, purplish, or brown spots appear on new buds, leaves,
and shoots. Spots expand and centers turn brown. Small dark
specks form in the brown centers. These help distinguish
shot hole from other diseases. Affects Prunus spp.
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Septoria
Round, angular, flecked, sunken, or irregular spots appear
on mostly older leaves. Affects Populus spp., azaleas,
and hebe.
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