Nursery Landscape Disorders

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Nursery/ Landscape Disorders

• Eddie McKie

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APHIDS

• Small (up to ¼) soft-bodied insects.
• The characteristic feature that distinguishes
  aphids from other insects are the tail pipes
  (called cornicles) which extend from the rear of
  their abdomen.

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Bagworm

• Any of several moths of the family Psychidae,
  which construct fibrous cases of silk spun
  together with leaves, twigs, or grass. The
  plant-feeding larvae and wingless adult females
  live in these cases.

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Borer

• Type of caterpillar that goes inside the plant
  (usually between cambium and bark or inside the
  pith of some stems) and feeds. Can and often
  does cause death of plant.

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Grub

• Thick, soft insect larvae (usually a beetle
  larvae)

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LEAF MINER

• Insect larvae that feed inside a leaf, between
  the upper and lower surfaces.

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MEALY BUG

• Mealybugs derive their name from the white, waxy,
  mealy secretions that cover their bodies.

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POWDERY MILDEW

• Infected plants will display white powder-like
  spots on the leaves and stems.
• The fungus is favored by periods of high relative
  humidity or site conditions that promote a more
  humid environment

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SCALE

• Either soft scales or armored scales
• Covered with waxy shell for most of their life
  which protects them from predators or insecticides

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SLUG

• Slugs are gastropod mollusks without shells or
  with very small internal shells, in contrast to
  snails.

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SPIDER MITE

• To the naked eye, spider mites look like tiny
  moving dots
• Adults have eight legs and an oval body, with two
  red eyespots near the head end of the body.

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WHITEFLY

• Adults are less than 1/8 long and, like their
  name suggests, have white wings with pale yellow
  bodies.
• Adult whiteflies congregate above and under leaf
  surfaces, and disperse in clouds when disturbed.

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BLACK SPOT

• Round to irregular black splotches with fringed
  margins are quite obvious, mostly on upper leaf
  surfaces.
• Round to irregular black splotches with fringed
  margins are quite obvious, mostly on upper leaf
  surfaces. Leaf yellowing develops around these
  black spots, with defoliation of these infected
  leaves common. Round to irregular black splotches
  with fringed margins are quite obvious, mostly on
  upper leaf surfaces. Leaf yellowing develops
  around these black spots, with defoliation of
  these infected leaves common. Leaf yellowing
  develops around these black spots, with
  defoliation of these infected leaves common.

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IRON CHLOROSIS

• Iron chlorosis is a yellowing of plant leaves
  caused by iron deficiency that affects many
  desirable landscape.
• The primary symptom of iron deficiency is
  interveinal chlorosis, the development of a
  yellow leaf with a network of dark green veins.

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Annual Bluegrass

• One of the most common weeds of turf, ornamental
  plantings, and gardens in the United States. It
  has a boat-shaped tip, folded in the bud.

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Plantain

• Species of familiar garden, lawn, and roadside
  weeds. The leaves lack a proper blade. What
  appears to be a blade is an expanded petiole with
  several parallel main veins, emerging at the base
  of the stalk. Small flowers are borne in spikes
  or heads atop long leafless stalks

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NUTGRASS

• Nutgrass has yellow-green, wide-bladed leaves
  that are smooth and shiny or waxy on the upper
  side.
• Nutgrass grows 1-3 feet tall if not mowed.
• Yellow and purple varieties

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Chickweed

• Either of two species of small-leaved weeds.
  Common chickweed usually grows to 18 in. but is a
  low-growing and spreading annual weed in mowed
  lawns. Mouse-ear chickweed is usually a shorter,
  mat-forming, spreading perennial with many
  upright stems. Both species have inconspicuous
  but delicate white, star-shaped flowers.

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CRABGRASS

• Crabgras is a low-growing summer annual that
  spreads by seed and from rootings of nodes that
  lie on the soil.
• It may grow upright to a height of 2 feet. It
  will not tolerate close mowing as well as smooth
  crabgrass.
• True leaves are generally 3 inches long and hairy
  on the upper surface of the leaf and leaf sheath.
  
• The branches are l about 2 to 5 inches at the end
  of the stalk.

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Dandelion

• Weedy perennial herbaceous plant that is
  widespread in much of temperate North America.
  Has a rosette of leaves at the base of the plant
  a deep taproot a smooth, hollow stem and a
  solitary yellow flower head composed only of ray
  flowers (no disk flowers). The fruit is a
  ball-shaped cluster of many small, tufted,
  one-seeded fruits.

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Henbit

• Lower leaves have a stalk while the upper leaves
  clasp the stem. Stems are square. Leaves are
  coarsely toothed and opposite from each other.
  Flowers appear in May and are about one-half inch
  long, trumpet-shaped, pinkish white to purple,
  and form just above upper leaves.

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OXALIS

• The leaves are divided into three to ten or more
  round, heart-shaped or lanceolate leaflets,
  arranged in a whorl with all the leaflets of
  roughly equal size.
• The majority of species have three leaflets in
  these species, the leaves are superficially
  similar to those of some clovers

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Clover

• Creeps to form patches in turf and emerges from a
  fibrous root system. Compound leaves are
  composed of three unstalked oval leaflets, up to
  4/5 inch long. They are dark green and often with
  faint, white, crescent-shaped markings. Clover
  flowers occur in ball-shaped white to pink
  clusters of pea-shaped flowers that are held
  slightly above the foliage. This weed occurs in
  most lawns and especially in moist, low-fertility
  soils throughout growing season.

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Purslane

• Common purslane is an annual broadleaf that grows
  rapidly in spring and summer. Leaves are very
  succulent, often tinged red, and wedge-shaped.
  Small yellow flowers are born singly or in
  clusters of two or three in stem junctions or at
  tips of stems. The mature plant may form a mat or
  grow up to a foot tall. The plant branches at the
  base and along the stems. Purslane seeds are very
  tiny and produced in abundance.

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Wild Garlic/Onion

• Wild Onion Characteristics
• Bulb has reticulated (net like) membrane or
  covering.
• Leaves occur from the base of the plant, and tend
  to be flat (not hollow).
• Wild Garlic Characteristics
• Leaves are hollow, and tend to be formed higher
  on the stem (not where stem comes out of the
  ground).
• Distinct garlic odor.