Image Number: 1402062

Descriptor:
Damage
Description:
Soon after exposure to high levels of atmospheric pollutants, leaves may develop dark green water-soaked spots about 1/10 inch in diameter. Within hours, the spots turn dark brown, sometimes remain brown, but often turn white within 48 hours. Symptoms occur most often in low areas of fields. Plants are most sensitive when growing rapidly (plant bed and 4-6 weeks after transplanting), but symptoms may appear at any stage of growth. In the plant bed or on very sensitive varieties, spots appear over the entire leaf surface but are usually confined to the leaf tips of less sensitive varieties. Occasionally spots coalesce, or a central spot may be surrounded by smaller ones. Weather fleck is often confused with other flecks caused by chemicals, diseases, or nutritional disorders.
Image type:
Field

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Image location:
United States

Subject

Kingdom: Other damage agents
Phylum: Other damage agents
Class: Other damage agents
Order: Abiotic
Family: Other abiotic damage
Subject: weather fleck

Host

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Solanales
Family: Solanaceae
Genus: Nicotiana
Subject: Nicotiana tabacum (flue-cured type) L.
Node Affiliation:
Image uploaded:
Sunday, March 10, 2002
Image last updated:
Monday, May 9, 2011