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

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Pine > Needles > Missing or chewed needles

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  • European pine sawfly 1
  • European pine sawfly 2
  • European pine sawfly 3

European pine sawfly
Neodiprion sertifer

  • Larva feed only on old (last year's) needles
  • Needles chewed on by young larvae become discolored and straw-like
  • Larvae feed in colonies, feeding on one branch at time
  • Active from May to June; one generation per year
  • Feeds particularly on mugo, Scots, red and jack pines
  • Larvae have shiny, black heads, grey, green body with dark green stripes; they are ¾ - 1 inch long when fully grown
  • More information on European pine sawfly...
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  • Redheaded pine sawfly 1
  • Redheaded pine sawfly 2
  • Redheaded pine sawfly 3

Redheaded pine sawfly
Neodiprion lecontei

  • Larvae feed on both old (last year's) and new needles
  • Larvae feed in colonies, feeding one branch at a time
  • Feeding by young larvae leave needles dry and straw-like
  • Active between mid-June and late July and again from mid-August and late September; two generations occur per year (primarily in southern MN)
  • Prefers young pine (5 - 20 foot tall); many species of pines are attacked, especially red and jack pines
  • Larvae are ¾ to 1 inch long when fully grown; they are yellow with rows of black spots and reddish brown head
  • More information on Redheaded pine sawfly...
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  • Introduced pine sawfly 1
  • Introduced pine sawfly 2
  • Introduced pine sawfly 3

Introduced pine sawfly
Diprion similes

  • Missing needles on old (last year's) needles; can also feed on new growth
  • Needles chewed on by young larvae become discolored and straw-like
  • Larvae feed in colonies, feeding on one branch at a time
  • Active from late May/early June to early July and again from late July through early September; two generations per year
  • Prefers white pine; will also feed on Scots, jack and red pine
  • Larvae grow to ¾ - 1 inch in length; Larvae have black heads, a yellow-green body with a black double stripe and many yellow and black spots
  • More information on Introduced pine sawfly...
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  • Rabbit damage 1
  • Rabbit damage 2
  • Rabbit damage 3

Rabbit damage

  • Bark from young trees only is completely removed from the main trunk
  • Regular scraping the size of a spoon tip can be seen in the wood
  • Damage can occur from ground level to several feet up the trunk depending on the depth of winter snow
  • Small twigs are cleanly cut off with a sharp edge, at a 45 degree angle
  • Majority of damage occurs in winter and early spring
  • Rabbit droppings (small, round pellets) often found near damaged tree
  • More information on Rabbit damage...
5 of 6
  • Sawflies 1
  • Sawflies 2

Misc. sawflies
(jack, red and white pine sawflies)

  • Missing needles
  • Needles may be completely consumed, partially eaten or become straw-like from feeding
  • Larvae feed gregariously (i.e. in nonsocial groups), on new or old needle growth
  • Larvae 1 inch long or less, green or yellowish-green with spots or stripes
  • Different pine species favored by different sawflies but most pine are susceptible
  • More information on Sawflies...
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  • Gypsy moth 1
  • Gypsy moth 2

Gypsy moth
Lymantria dispar

  • Chew needles and occasionally defoliate conifers, particularly when small and adjacent to preferred hosts, such as aspen and oak
  • Mature larvae are 2 inches long; upper side has five pairs of blue dots near front of body followed by six pairs of red dots down the back
  • Damage occurs in June and July
  • Is currently a federally quarantined pest in Minnesota; not established in Minnesota; if found, call Minnesota Dept. of Agriculture at 651-201-6684 or 1-888-545-6684
  • More information on Gypsy moth...

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