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PLPA 3003 Exam Study Guide @
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PLPA 3003 Exam Study Guide @2024- 2025
lachnellula willdonnii - Answer European larch canker. 1st canker disease studied in the
1800's
diplodia pinea - Answer Diplodia canker(older name sphaeropsis). Causes shoot blight
and cankers on hard pines. Only asexual stage known- pycnidia(also produced on
cones) produced at the base of needles on dead shoots
fusarium circatum - Answer Pitch canker. affects pines
Atropellis canker - Answer lodgepole pine, black apothecia are produced on cankers.
Can occur on white pines, black discoloration in wood behind the canker.
Leucocystospora canker - Answer Spruce. Kills branches and norway spruce growing
outside their natural range. Cankers kill branches but do not move into the main trunk of
the tree
. cankers full of resin.
Dutch elm disease ophiostoma ulmi, ophiostoma novo-ulmi - Answer Symptoms-
chlorosis followed by necrosis, wilting, vascular discoloration
Fungus- ophiostoma ulmi-1930's to 1950's
Ophiostoma novo-ulmi emerges that is more aggressive and more pathogenic. This new
strain gets introduced back into europe
Asexual stages: synnema(another name is coremium)- sticky spores produced
sporothrix(yeast like phase)
Sexual stage- A + B strains= perithecia produce ascospores in sticky droplet on top of
perithecial neck
Hylurgopinus rufipes - Answer North american elm bark beetle. Vector of dutch elm.
Maturation feeding is in larger branches. Egg laying- oviposition gallery is across the
grain of the wood
scolytus multistriatus - Answer european elm bark beetle. vector of dutch elm.
Maturation feeding at twig crotches. Egg laying oviposition gallery is with the grain of
the wood
Vector of dutch elm(carrier) - Answer Banded Asian elm bark beetle scolytus
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