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How to Manage Pests

Pests in Gardens and Landscapes

Identification and confirmation—Air pollution

Air pollution damage is difficult to diagnose because many symptoms are similar to, and aggravated by, those from other disorders and pests. Look-alike disorders include aeration deficit, foliar pathogens, herbicide damage or other chemical phytotoxicity, nutrient disorders, sucking insects and mites, and water deficit.

Ozone damage Maladies that can resemble ozone damage

Ozon tip dieback and banding
Ozone tip dieback and banding

Rust fungus, needle banding
Rust fungus, needle banding

Scale insects and feeding discoloration
Scale insects and feeding discoloration

Ozone bleaching, bronzing
Ozone bleaching, bronzing

Thrips bleaching, bronzing
Thrips bleaching, bronzing

Lace bug bleaching, stippling
Lace bug bleaching, stippling

Ozone, chlorotic and necrotic spots
Ozone, chlorotic and necrotic spots

Spider mite bleaching, stippling
Spider mite bleaching, stippling

Anthracnose fungus dieback
Anthracnose fungus dieback
Sulfur dioxide damage Maladies that can resemble sulfur dioxide damage
Sulfur dioxide foliage browning
Sulfur dioxide foliage browning

Mineral or salt toxicity, foliage browning
Mineral or salt toxicity, foliage browning

Water deficit, browning and dieback
Water deficit, browning and dieback

Sulfur dioxide whitening of leaves
Sulfur dioxide whitening of leaves

Herbicide damage, whitening of foliage
Herbicide damage, whitening of foliage

Manganese deficiency, interveinal bleaching
Manganese deficiency, interveinal bleaching

MORE INFORMATION

Abiotic Disorders of Landscape Plants, UC ANR

Air Pollution, UC IPM

Urban Trees and Ozone Formation (PDF), UC ANR

Low temperature (freeze) bleaching
Low temperature (freeze) bleaching

Zinc deficiency, interveinal whitening
Zinc deficiency, interveinal whitening

Statewide IPM Program, Agriculture and Natural Resources, University of California
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