Pesticide Applicator's License - Forest
Pest Control (Category 4a) Questions
And Answers With Verified Solutions
100% Correct!!!
Hypoxylon canker - ANSWER✔✔ most destructive canker of aspen and one of the
most important diseases in Great Lakes States; enters tree at branch stubs and
causes yellowing then irregular bark collapse
canker - ANSWER✔✔ general term to describe diseases of bark and cambium,
which generally occur as a result of wounding
wood decay fungi (Northern hardwoods) - ANSWER✔✔ cause hardwood lumber
to lose quality because the tree's response to wounding is to form a barrier zone
that discolors cambium then is colonized by microorganisms and this fungi
fungal pathogens - ANSWER✔✔ most prevalent cause of tree disease; causes seed
rots, seedling damping off, root rots, foliage diseases, cankers, vascular wilts,
diebacks, galls, and tumors, trunk rots, and decays of aging trees
Armillaria (Shoestring) Root Rot - ANSWER✔✔ "honey mushroom"; causes an
economically important root and butt rot of forest, orchard, and ornamental trees
and shrubs, shown by reduced vigor, yellowing of foliage, and crown dieback;
flattened rhizomorphs (shoestrings) appear between bark and wood
Oak Wilt - ANSWER✔✔ vascular wilt disease that kills trees in the oak genus by
plugging water-conducting cells; spreads through root grafts and fresh wounds via
insect vectors; no cure for infected trees
, Dutch Elm Disease - ANSWER✔✔ vascular wilt disease transmitted by European
and native elm bark beetles; evidenced by wilting, yellowing, and browning of
leaves; diseased branches develop brown streaking in wood
scleroderris canker - ANSWER✔✔ canker that is problematic to red, jack, and
Scotch pines, primarily in nurseries and young plantations; infected needles turn
orange at the base in early May and brown out by summer; cankers form later on
twigs, branches, and trunks, killing young trees within a few months
White Pine Blister Rust - ANSWER✔✔ Fungus affects eastern white pine and
wild current; Colonizes needles and moves in to twig, eventually forming cankers
which become covered in resin; girdled branches form brown, drooping red
needles called flags; yellow-orange spores are released from cankered areas
Lophodermium needle cast - ANSWER✔✔ Christmas tree plantation disease that
especially affects Scotch pine and appears as brown spots with yellow margins
then black, football-shaped fruiting bodies on infected needles
Sphaeropsis Blight - ANSWER✔✔ Christmas tree plantation disease that
especially affects Scotch pine and Austrian pine, killing current-year shoots,
evidenced by small, black fruiting bodies that erupt from dead needles and shoot
tissue (sunken cankers may also form){
Phytophthora root rot - ANSWER✔✔ Christmas tree plantation disease that
especially affects Frasier fir; associated with wet soils and poor drainage; infection
causes decay of roots, leading to growth cessation and then chlorosis, drooping,
and browning of branches
Swiss Needlecast - ANSWER✔✔ Christmas tree plantation disease that especially
affects Douglas fir; needles turn yellow green mottled with brown or entirely
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