This document discusses several apricot injurious insects including the peach silver mite, peach twig borer, peachtree borer, San Jose scale, leafrollers, oriental fruit moth, shothole borer, Pacific flatheaded borer, and mealy plum aphid. For each insect, it provides the scientific name, a brief description of the type of damage it causes to apricots, and sometimes images. The insects can damage apricot shoots, nuts, tree bark and wood, leaves, and reduce tree vigor and productivity.

2. Apricot Injurious Insects
A
Lecture To ToT trainees (
FFS)
By
Mr. Allah Dad Khan
Provincial Coordinator IPM KPK
MINFAL Pakistan

3. DAMAGE
Scientific name: Aculus
cornutus
 Peach silver mite is not usually
damaging in almonds, although it
can cause symptoms if populations
build up to high levels on trees under
6 years old. Feeding by peach silver
mite causes tiny chlorotic spots that
give the leaf a silvery appearance,
especially along the midvein of the
upper leaf surface. Symptoms
resemble thrips or leafhopper
damage. Once higher temperatures
occur in late spring, brown necrotic
spots develop along leaf margins
following silver mite feeding early in
the season.
Peach Silver Mite

4. DAMAGE
Scientific name: Anarsia
lineatella
 Larvae damage
both growing shoots and
nuts, causing shallow
channels and surface
grooves on the nutmeat.
Peach twig borer damage
can be masked by navel
orangeworm feeding,
which often occurs on
nuts previously damaged
by peach twig borer.
Peach Twig Borer

5. DAMAGE
Scientific
name: Synanthedon exitiosa
 This wood-boring insect can
successfully attack healthy
trees. The larval stage bores
into the crown and trunk of
the tree, and mines the
cambial layer, often near the
graft union. If this occurs for
several years, the tree may
eventually become girdled
and die. It attacks only the
peach rootstock and does not
infest the almond scion.
Peachtree Borer

6. DAMAGE Scientific name: Diaspidiotus
(=Quadraspidiotus) perniciosus
 Scales suck plant juices
from twigs and limbs, and
inject a toxin, resulting in
loss of tree vigor, growth
and productivity, and death
of limbs. A red halois
produced around a feeding
site on 1-year-old green
wood. Untreated
infestations can kill fruit
spurs and scaffold wood
within 1 to 3 years.
San Jose Scale

7. DAMAGE
Scientific names:
Fruittree leafroller: Archips argyrospila
Obliquebanded leafroller: Choristoneura
rosaceana
 Leafrollers are occasional pests of
almonds. The primary damage
occurs early in the season when
larvae of the overwintered
generation feed on developing
nuts and hollow them out. Many
of the damaged nuts are lost in
the June drop, presumably
reducing yield. The summer
generation of the obliquebanded
leafroller ties leaves and nuts
together and feeds on the hulls.
Leafroller feeding on the hulls
increases later nut infestation by
navel orangeworm.
Leafrollers

8. DAMAGE
Scientific
name: Grapholita molesta
 First-and second-generation
larvae mine young, tender
shoots, causing them to wilt and
die. Third- and fourth-generation
larvae feed between the hull and
shell; this damage is difficult to
distinguish from that caused by
peach twig borer. Damage is
rarely significant. Occasionally,
larvae have been found feeding
on nut meats. They may feed in
groups of several larvae within a
nut. Larvae do not produce
webbing but do produce a
characteristic reddish brown
frass in the hull.
Oriental Fruit Moth

9. Damage
Scientific name: Scolytus
rugulosus
 Normally a number of
shothole borer adults
invade a tree at the same
time. Healthy trees exude
resin, which usually kills
the insects. If the tree has
injured or weakened areas,
this resin buildup does not
develop and the invasion is
successful. Ultimately,
larvae may girdle the tree,
or tree part, and cause its
death.
Shothole Borer

10. Damage
Scientific
name: Chrysobothris mali
 Pacific flatheaded borers are attracted to
diseased or injured limbs, such as those
affected by sunburn, scale insects,
bacterial canker, or major pruning cuts.
The beetles lay eggs in the injured area.
Eggs hatch and the larvae excavate large
caverns just beneath the bark and bore
tunnels deep into the heartwood of the
tree. Excavations are usually filled with
finely powdered sawdust. Injury by this
borer will cause the sap to flow, and the
affected area will appear as a wet spot on
the bark. Later, these areas may crack and
expose the mines. Feeding by Pacific
flatheaded borers may cause a portion of
the bark on older trees to die, or it may
girdle and kill young trees. This borer can
be particularly damaging to new grafts in
established orchards
Pacific Flatheaded Borer

11. DAMAGE
Scientific
Name: Hyalopterus pruni
 Vegetative growth on the
trees may be stunted by
high populations, but the
principal damage caused
by mealy plum aphid is
the development of the
black sooty mold that
grows on the aphid's
honeydew
Mealy Plum Aphid