black spot

See also: blackspot

English

black spot leaf disease (1)

accident blackspot warning sign (2)

Alternative forms

• blackspot

Noun

black spot (plural black spots)

1. (phytopathology) A fungal disease among plants, particularly roses, that results in black spots on the leaves.
   • 2006, Mary Moody, Mary Moody's Roses, Allen & Unwin, →ISBN, page 20:

     In areas where black spot is only a problem after heavy rain or later in the season, restrict spraying to these times, or if yellowing or spotted foliage is detected.

2. (transport) A section of roadway that has been designated as being particularly accident-prone.

   Synonym: accident blackspot

   • 2019, Will Birch, Cruel To Be Kind: The Life and Music of Nick Lowe‎^[1], Hachette UK, →ISBN:

     Indian Queens is a hamlet just off the A30, a well-known traffic black spot, and Yellowknife was Margo Kidder's hometown in Canada.

3. (by extension) A dangerous place or area.
4. (telecommunications) A location with poor radio signal reception, e.g. for mobile phones.
   • 2013, Judith Cutler, Life Sentence‎^[2], Allison & Busby, →ISBN:

     What if—like so many rural parts of the county—this was a mobile black spot? That was easily tested. No, she had no problem dialling her own home number.

5. (figurative) A subject or area about which little or no information is available.

   Near-synonyms: black hole, blind spot

   • 2003, Andreas Kappeler, “The Russian Empire and Its Nationalities in Post-Soviet Historiographies”, in Hayashi Tadayuki, editor, The Construction and Deconstruction of National Histories in Slavic Eurasia, Sapporo: Slavic Research Center, Hokkaido University, →ISBN, page 38:

     Historians began to reanimate elements of the national historical memory partially destroyed by Soviet power. The closed book-shelfs^[sic] and archives were (at least partially) opened, and “black spots” and taboos could now be tackled by national historians.

6. (fiction) A fictional judicial device among pirates, consisting of a black circle indicating condemnation.
   • 1881–1882, Robert Louis Stevenson, Treasure Island, London; Paris: Cassell & Company, published 14 November 1883, →OCLC, part I (The Old Buccaneer), page 31:

     I went down on my knees at once. On the floor close to his hand there was a little round of paper, blackened on the one side. I could not doubt that this was the black spot; and taking it up, I found written on the other side, in a very good, clear hand, this short message: “You have till ten to-night.”

7. (snooker) The spot on a snooker table where the black ball is normally placed.

Derived terms

• citrus black spot

Further reading

• black spot on Wikipedia.Wikipedia
• black spot leaf disease on Wikipedia.Wikipedia
• accident blackspot on Wikipedia.Wikipedia

Anagrams

• black tops, black-tops, blacktops, postblack