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  1. Dogwood Borer
    • Is a day flying moth that looks like a wasp
    • is best controlled by foliar spray treatments in mid may
    • gains entrance to cambium through wounds
    • is controlled by bark drench treatments with permethrin
    • best time to treat is mid-may throughout the summer
    • lindane will treat it fourteen days after the first capture of dogwood borer moths
  2. Black vine weevil
    • is a pest on yew, azalea, taxus and rhododendrons
    • adults are unable to fly
    • has one generation a year
    • feed at night
    • larvae feed on young roots and bark of large roots often result in death
    • best to treat later in day, with acephate, azadirachtin
    • treatment should be between june 10-20. a second app three weeks if u see adults in burlap traps.
    • adults are matalic green with copper wings
    • feed on foliage during day, most active on sunny warm days
    • eggs are laid in the soil
    • larvae are grayish-white grubs with brown heads
    • 1generation/year
    • larvae chew off grass roots so that the turf can be rolled up like a carpet, grass turns brown and dies
    • for grubs- control mid-april to mid-may or between or late july to mid-september
    • adults - control july through late august
  4. Chinch bug
    • black with shiny whit wings that have a black spot on them
    • older nymphs are black with easily visible, developing wing pads
    • one to two generations per year
    • adults become active in temp above 45deg
    • they thrive in hot, dry weather in turf with heavy thatch
    • often appears first on dry, sunny, dry areas on southerly slopes, or on turfgrass adjacent to driveways sidewalks or other radiate heat.
  5. Sod Webworm
    • Adults may be seen facing downward on the turfgrass stem
    • whitish to light gray or tan in color, and have a snoutlike projection from their heads
    • Larvae have a caterpillar-shaped body, are gray to beige-brown with dark spots, and have three pairs of front legs and five pair of back legs
    • two generations/year
    • larvae can be expected two weeks after peak moth flights
  6. Bill Bug
    • Gray, black, or brown weevils though newly emerged adults may be reddish brown in color
    • chewing mouthparts
    • have a long snout or "bill"
    • larvae are white grubs with brown head capsules all instars resemble eachother except for their size
    • damage looks like that of a chinch bug but the bill bug leaves a whitish saw dust like material which may be found around the base of the plant
    • treatment in april through late may
    • nematodes treat billbugs
  7. Boxwood leafminer
    • all varieties of boxwood attacked
    • orange nat-like flies, tiny yellowish-orange maggots feed inside the leaves
    • 1 generation per year
    • mined or blistered foliage is evident in mid-summer
    • infested leaves are spotted yellow and may drop prematurely
    • continuous infestations result in dead twigs and a weakened plant
    • foliar spray treatments on underside of leaves in May to control adult flies before they lay eggs
    • systemics will control young larvae in leaves late May-early june
    • acephate, carbaryl,acamectin
  8. Holly leafminer
    • English holly
    • adults are black flys that appear in mid-late May
    • eggs are laid inside newly developing leaves
    • larva is a yellowish-colored maggot that forms slender trail-like mines or blotch mines in the leaf by feeding on plant tissue. mines have a brownish appearance due to loss of chlorophyll
    • 1 generation/year
    • tree will drop leaves in a heavy infestation
    • adult females use their ovipositor to puncture the leaf tissue and feed on the sap that exudes from the wound.
    • foliar spray on upper and lower surfaces of leavesin mid to late May when adult flies are seen around new growth.
    • systemics will control young miners in foliage, early spring
    • acephate, carbaryl, bifenthrin
  9. Bronze Birch borer
    • grayish-black beetle with a faint bronze-metalic sheen
    • 1 generation/year
    • larvae bore under bark causing girdling and dieback, dieback begins at top
    • they make D-shaped holes in the bark
    • spray terminals and bark
    • bifenthrin, permethrin
  10. Lace bugs
    • azalea, rhododendron, sycamore
    • adults are flat, beautifuly sculptured and resemble an intricate, lacy network
    • most species are host specific
    • nymphs are dark colored and often spiny
    • 2 or more generations/year depending on species
    • piercing-sucking mouth parts
    • feed on the undersurface of a leaf results in white flecks that can be seen on the upper leaf surface due to the loss of chlorophyll, similiar to leafhoppers but dark varnish-like spots of excrement are present on underside of leaves
    • check underside of leave for adults nymphs and tar spots
    • treat underside of leave when population is detected usually late spring through summer
    • acephate, bifenthrin, carbaryl
  11. Hemlock woolly adelgid
    • eastern hemlocks
    • females are circular and black
    • nymphs are reddish-brown to black
    • overwintering stage lays eggs in Feb-march, first generation of nymphs hatches out april-may, eggs are laid in june , hatch in early july. Immatures rest through summer then feed during the fall into winter-mature in fall
    • overwinter as mature females
    • 2 generations/year
    • feed on plant juices
    • discolor needles that drop prematurely, killing branches
    • small trees die in 1yr, larger trees 2-6yrs
    • can travel on birds so dont put birdfeeders near hemlocks
    • dont fertilize infested trees, nitrogen stimulates the adelgids
Card Set:
2012-01-28 14:14:13

woody ornamentals
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