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Extension > Garden > Diagnose a problem > What's wrong with my plant? > Evergreen Trees and Shrubs > Pine > Spots or bands on needles

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Pine > Needles > Spots or bands on needles

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  • Pine needle scale 1
  • Pine needle scale 2
  • Pine needle scale 3

Pine needle scale
Chionaspis pinifoliae

  • Adults are small white, 1/8 inch long flecks on needles; visible all year
  • Immature crawlers are active in May; are reddish-brown and the size of pinhead
  • Light infestations generally don't show symptoms
  • Moderate to heavy infestations can cause needles to discolor and even branches to die
  • Attacks all pine as well as other evergreens
  • More information on Pine needle scale...
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  • Dothistroma needle blight 1
  • Dothistroma needle blight 2
  • Dothistroma needle blight 3

Dothistroma needle blight
Mycosphaerella pini

  • Tan to brown spots on 1 yr. or older needles turn red in the sun
  • Needle tips are tan, bases remain green, scattered with brown or red spots
  • Tiny, raised, black pimple-like fungal spore producing structures form on dead needle tissue
  • Diseased needles turn completely brown and eventually drop
  • Lower portions of tree are most severely affected
  • Most common on Austrian and ponderosa pine; Scots pine has some resistance
  • Lab analysis is often necessary to distinguish Dothistroma needle blight from Brown spot
  • More information on Dothistroma needle blight...
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  • Brown spot needle blight 1
  • Brown spot needle blight 2
  • Brown spot needle blight 3

Brown spot needle blight
Mycosphaerella dearnessii

  • Small yellow to brown, resin-soaked spots form on 1 yr old needles in June-Aug
  • Often needle tip is killed and turns tan, base of needle remains green with random yellow to brown spots
  • Tiny, raised, black pimple-like fungal spore producing structures form on dead needle tissue
  • Diseased needles fall off in autumn
  • Infections are most common on lower branches
  • Outbreaks favored by prolonged wet weather in June and July
  • Scots pine most commonly infected; many Minnesota pines are susceptible
  • Lab analysis is often necessary to distinguish Brown spot from Dothistroma needle blight
  • More information on Brown spot needle blight...
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  • Pine needle rust 1
  • Pine needle rust 2
  • Pine needle rust 3

Pine needle rust
Coleosporium asterum

  • Yellow to orange spots or bands on needles
  • Late spring to early summer, raised white tubes form on needle spots, these break open and release orange spores
  • Lower branches most severely effected with browning and needle loss
  • Many two and three needle pines are susceptible
  • Also infects nearby members of the aster family
  • More information on Pine needle rust...
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  • Lophodermium needle cast 1
  • Lophodermium needle cast 2
  • Lophodermium needle cast 3

Lophodermium needle cast
Lophodermium seditiosum

  • Yellow to brown spots appear in late summer or early fall
  • 1 yr old needles turn brown in spring
  • Gray to black ovals with a slit down the center (fungal spore producing structures) can be seen on dead needles
  • Infected needles drop prematurely during the summer
  • Lower branches and small trees most severely effected
  • Common on red, Austrian and Scots pine
  • More information on Lophodermium needle cast...

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