Nursery/ Landscape Disorders

Nursery/ Landscape Disorders Eddie McKie

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. APHIDS

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. Bagworm

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. Borer

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

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

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

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 POWDERY MILDEW

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

Slugs are gastropodmollusks without shells or with very small internal shells, in contrast to snails. SLUG

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. SPIDER MITE

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. WHITEFLY

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. BLACK SPOT

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. IRON CHLOROSIS

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. Annual Bluegrass

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 Plantain

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 NUTGRASS

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. Chickweed

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. CRABGRASS

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. Dandelion

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. Henbit

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 OXALIS

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. Clover

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. Purslane

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. Wild Garlic/Onion

Nursery/ Landscape Disorders