This document discusses several common insect pests that affect peas, including their symptoms and causes. It describes the Mexican bean beetle, aphids, spider mites, leafminers, and thrips. For each pest, it provides details on their appearance, the type of damage they cause such as feeding marks or webbing, and how heavy infestations can impact the plant. The goal is to educate farmers on identifying these pests based on the symptoms they cause to peas and other bean crops.

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

4. Mexican bean beetle
Epilachna varivestis
Symptoms
• Irregular patches of feeding
damage on underside of leaves
which causes the top surface of
the leaf to dry out, giving the
leaves a lacy appearance; insect
will also damage flowers and
small pods; pods may be
damaged so badly that they drop
from the plant; adult insect is an
orange-brown beetle with black
spots; larvae are fat-bodied grubs
which taper at the end and are in
rows of conspicuous spines
• Cause
• Insect
Adult Bettle

5. Mexican bean beetle
larva Egg Clusture

6. Aphids (Pea aphid, Bean aphid, Cowpea aphid, Melon aphid, Peach aphid, etc.)
Acyrthosiphon pisum
Aphis spp.
Myzus persicae
Symptoms
• Small soft bodied insects on
underside of leaves and/or stems of
plant; usually green or yellow in
color, but may be pink, brown, red
or black depending on species and
host plant; if aphid infestation is
heavy it may cause leaves to yellow
and/or distorted, necrotic spots on
leaves and/or stunted shoots;
aphids secrete a sticky, sugary
substance called honeydew which
encourages the growth of sooty
mold on the plant
• Cause
• Insects
Close-up image of a pea aphid
(Acyrthosiphon pisum)

7. Spider mites (Two-spotted spider mite)
Tetranychus urticae
Symptoms
• Leaves stippled with yellow;
leaves may appear bronzed;
webbing covering leaves;
mites may be visible as tiny
moving dots on the webs or
underside of leaves, best
viewed using a hand lens;
usually not spotted until there
are visible symptoms on the
plant; leaves turn yellow and
may drop from plant
• Cause
• Arachnid

8. Leafminers
Lyriomyza spp.
Symptoms
• Thin, white, winding trails on
leaves; heavy mining can
result in white blotches on
leaves and leaves dropping
from the plant prematurely;
early infestation can cause
yield to be reduced; adult
leafminer is a small black and
yellow fly which lays its eggs in
the leaf; larvae hatch and feed
on leaf interior
• Cause
• Insects

9. Thrips (Western flower thrips, Onion thrips, etc.)
Frankliniella occidentalis
Thrips tabaci
Symptoms
• If population is high leaves
may be distorted; leaves are
covered in coarse stippling and
may appear silvery; leaves
speckled with black feces;
insect is small (1.5 mm) and
slender and best viewed using
a hand lens; adult thrips are
pale yellow to light brown and
the nymphs are smaller and
lighter in color
• Cause
• Insect
flower thrips