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brown blotch

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brown blotch [′brau̇n ¦bläch]
(plant pathology)
A bacterial disease of mushrooms caused byPseudomonas tolaasiand characterized by brown blotchy discolorations.
A fungus disease of the pear characterized by brown blotches on the fruit.


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Symptoms of brown blotch disease are sunken, dark, and brown spots on the mushroom fruit body surface (Olivier and others 1978).
Last is the leaf-mining moth, whose caterpillars cause brown blotch mines on horse chestnuts as well as several acers or maples including sycamores and Norway maples.
Dog's-tooth violets (Erythronium dens canis) are about six inches tall and their flowers are a pinkish purple There are several varieties, including Lilac Wonder (pale, purple flowers with a brown blotch at the base of each) Purple King (deep purple with a striped and spotted white and brown centre) and a white-flowered one, White Splendour.
 
 
 
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