nursery/landscape pests & disorders identification
TRANSCRIPT
Nursery/Landscape Pests & Disorders
Identification
Insects
Aphid
Small, soft-bodied insects Green, pink, black or yellow
Can be wingless They cluster on tips of new
growth & leaf undersides Suck plant juices
Secrete “Honeydew” A sweet smelling fluid that
attracts ants and causes black sooty fungus to grow on leaves
Bagworm
Caterpillars that make spindle-shaped bags
Attack both deciduous and coniferous trees Really like the
evergreens Will strip the plant of
foliage Often get mistaken for
pine cones
Borer Eventually transforms into a
moth They bore into the bark at
soil level and eat their way through the tree
Small, sawdust piles will appear around base of tree Sometimes sap will ooze
from small holes
Leafhopper• Largest family of
plant-feeding insects
• More leafhopper species worldwide than all species of birds, mammals reptiles and amphibians combined
• They feed by sucking the sap of vascular plants
Leaf Miner A moth that as a caterpillar
lives on the leaves of plants As it feeds, it leaves a trail
or a path way
Scale Sucking insects that insert
tiny, straw-like mouthparts into bark, fruit or leaves
Causes plant to weaken and grow slowly
Different species will harm the plant more than others
Spider Mite Congregate in dense
colonies on the undersides of leaves Damage by puncturing
plant cells You’ll see a silvering or a
stippled effect on top of leaf
When you rub the underside of a plant, the plant will feel gritty
Snail/Slug
Snails have coiled shells at adult age Slugs lack a shell or have an internal
shell Feed on leaves of plants
Whitefly Feed by sucking juices from the
leaves and stems of plants Especially vegetable plants
They secrete Honeydew as well They lay eggs on the underside of
the leaf that look like semitransparent scales
White Grub Larvae of Scarabs or
Beetles Attack the roots of turf
grass and ornamental plants
Damage appears to be drought-like
Diseases
Anthracnose
Fungi that attacks hardwoods Attacks Oaks and Sycamore more than others
Will completely defoliate trees Strip off all leaves
Starts with small parts of necrosis on leaves
Apple Scab A disease of apple trees caused by the
Ascomycete fungus Manifests by dull black or grey-brown
lesions on the surface of tree leaves Fruits are most susceptible Rarely kills the plant but dramatically
reduces yield
Black Spot Fungus that causes Black
Spots or dead spots to appear all over the leaf
Kills the photosynthetic capability of the plant
Botrytis A Necrotrophic fungus
A fungus that causes tissue to die Often referred to as Gray Mold Attacks the fruit of plants
Canker• Encompasses a large
number of plant diseases that have similar symptoms
• Dead tissue that grows over the years
• Cankers vary and each canker has a different effect on the plant
Cedar-Apple Rust• Caused by a fungal pathogen that attacks
crabapples and apples, as well as few junipers• Must move from one type of host to other
Crown Gall
Fireblight
Powdery Mildew
Root Rot
Weeds
Annual Bluegrass
Broadleaf Plantain
Buckhorn Plantain
Chickweed
Dandelion
Henbit
Nutsedge
OxalisWikipeida.org
Purslane
White Clover
Physiological Problems
Frost/Freeze Injury
Iron Deficiency
Leaf Scorch (drought/winter burn)
Nitrogen Deficiency
Pot-bound roots
String Trimmer Injury
2,4-D Injury