halo blight

noun

1. a blight affecting the leaves of oats and other grasses

• Hypernyms: ↑blight

2. a blight of bean plants

• Syn: ↑halo spot, ↑bean blight

• Hypernyms: ↑blight

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noun

1. also halo spot : a blight of beans and occasionally other legumes that is caused by a bacterium (Pseudomonas phaseolicola) and typically produces on the leaves, stems, and pods round water-soaked lesions surrounded by a yellowish zonation, the lesions finally turning brick red

2. : blight affecting the leaves of oats and other grasses caused by a bacterium (Pseudomonas coronafaciens) characterized by oval water-soaked lesions turning gray to brownish and surrounded by a pale zonation

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a disease of plants, characterized by small, necrotic leaf or fruit lesions surrounded by a yellowish, halolike band, caused by any of several bacteria of the genus Pseudomonas.

[1915-20]

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halo blight,

1. a bacterial disease that attacks the leaves, stems, and pods of beans, causing water-soaked spots surrounded by halolike areas of yellowish or reddish tissue.

2. a similar bacterial disease that attacks oats and certain other grasses.