Download Aphids Bagworms Lace Bugs Mealy Bugs Scale Spider Mites

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Aphids are small, soft-bodied insects that feed on stems, leaves, and other tender
plant parts and suck out plant fluids. Aphids seldom kill a mature plant. Large populations cause
curling, yellowing, and distortion of leaves and stunting of shoots. They can also produce large
quantities of a sticky substance known as honeydew, which often turns black with the growth of a
sooty mold fungus.
Bagworms Bagworm caterpillars make distinctive 1.5 to 2 inch long spindle-shaped bags
that can be seen hanging from twigs of a variety of trees and shrubs. Sometimes the bags are
mistaken for pine cones or other plant structures. When many small bagworms are present and
feeding, an insecticide may be needed to prevent serious damage.
Lace Bugs
Lace bug damage is first noticed as yellow spots on the upper leaf surfaces of
affected plants. These are similar to leafhopper and spider mite damage but usually more
extensive. Positive identification of lace bug
g damage
g is confirmed by
y the p
presence of shiny,
y black
droplets of excrement on the underside of damaged leaves. Frequently, the cast skins of the
nymphs remain attached to the underside of the leaves.
Mealy Bugs
Mealy bugs are white and are covered in a wooly white fuzz with distinct
filaments. Damage is caused by mealy bugs feeding and injecting toxins or plant pathogens into
host plants. They also secrete honeydew. Their feeding can cause premature leaf drop, dieback,
d plant
l td
th Once
l mealy
l bugs
it d th
i eggs, th
they can hatch
h t h in
i 6 to
t 14
days into “crawlers”. The crawler stage is the most easily controlled stage.
Scale Scale insects damage the plants by extracting sap and nutrients. They are small
insects that attach themselves to the plant and are covered with a shell or armor plate. They are
inconspicuous and usually go unnoticed until the plant show severe damage. The adult scale will
died This can give the impression that the plant is
remain attached to the plant even after it has died.
still infested with the insect.
Spider Mites Spider mites have a simple, oval shaped body and no wings or antennae.
Prolonged, heavy infestations cause yellowing or bronzing of the foliage and premature leaf drop
similar to drought stress. Severely infested plants may be stunted or even killed. Most of the mites
feed from the undersides of leaves, although the damage is most evident from the upper surface.
Webworms The webworm is a common pest of trees that attacks more than 88 different
kinds of plants, including many fruit, nut and ornamental trees and shrubs. They are known for the
large, unsightly webs they produce. Heavy infestations are rarely fatal, but if they occur over
several years they can stress trees and make them more susceptible to drought, disease or other
insect p
pests which can be fatal.
White Fly
White flies are minute insects with piercing and sucking mouth parts that suck
plant juices. They hide in huge numbers on the undersides of leaves, flying out in great clouds
when disturbed. They're common on citrus, greenhouse and foliage plants. Plants will appear
weak, and black sooty mold fungus may be evident on stems and leaves.