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Beans insects A Lecture By Allah Dad Khan Provincial Coordinator IPM MINFAL Islamabad
1.
2. Beans Insects
A
Lecture To ToT trainees ( FFS)
By
Mr. Allah Dad Khan
Provincial Coordinator IPM KPK
MINFAL Pakistan
3.
4. Aphids (Cowpea aphid, Pea aphid, etc.)
Aphis craccivora
Acyrthosiphon pisum
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 plants
Cause
Insect
5. Armyworms (Beet armyworm, Western striped armyworm)
Spodoptera exigua
Spodoptera praefica
Symptoms
Singular, or closely grouped circular to
irregularly shaped holes in foliage;
heavy feeding by young larvae leads to
skeletonized leaves; shallow, dry
wounds on fruit; egg clusters of 50-150
eggs may be present on the leaves; egg
clusters are covered in a whitish scale
which gives the cluster a cottony or
fuzzy appearance; young larvae are pale
green to yellow in color while older
larvae are generally darker green with a
dark and light line running along the
side of their body and a pink or yellow
underside
Cause
Insect
6. Corn earworm
Helicoverpa zea
Symptoms
Larvae damage leaves, buds,
flowers, pods and beans; young
caterpillars are cream-white in
color with a black head and black
hairs; older larvae may be yellow-
green to almost black in color with
fine white lines along their body
and black spots at the base of
hairs; eggs are laid singly on both
upper and lower leaf surfaces and
are initially creamy white but
develop a brown-red ring after 24
hours and darken prior to hatching
Cause
Insect
7. Cutworms
Agrotis spp.
Peridroma saucia
Nephelodes minians
and others
Symptoms
Stems of young transplants or
seedlings may be severed at soil
line; if infection occurs later,
irregular holes are eaten into the
surface of fruits; larvae causing
the damage are usually active at
night and hide during the day in
the soil at the base of the plants or
in plant debris of toppled plant;
larvae are 2.5–5.0 cm (1–2 in) in
length; larvae may exhibit a
variety of patterns and coloration
but will usually curl up into a C-
shape when disturbed
Cause
Insects
8. 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
9. 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
fruit 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
10. Loopers (Cabbage looper, Alfalfa looper)
Trichoplusia ni
Autographa californica
Symptoms
Large or small holes in leaves;
damage often extensive;
caterpillars are pale green with
a white lines running down
either side of their body;
caterpillars are easily
distinguished by the way they
arch their body when moving;
eggs are laid singly, usually on
the lower leaf surface close to
the leaf margin, and are white
or pale green in color
Cause
Insect
11. 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
12. Stinkbugs (Consperse stinkbug, etc.)
Euschistus conspersus
Symptoms
Dark colored pinpricks on fruit
surrounded by a lighter area that
turns yellow or remains light
green; stink bugs often carry
pathogens in their mouthparts
which can cause secondary
infections and decay of fruit; adult
insect is shield-shaped and brown
or green in color; may have pink,
red or yellow markings; eggs are
drum shaped and laid in clusters
on the leaves; larvae resemble the
adults but are smaller
Cause
Insect
13. 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
14. Bean Seed Maggots
Symptoms
The bean seed maggot
damages the seeds and
seedlings of beans,
corn, peas and other
vegetables. The full-
grown maggot is white,
1/4 inch long and lacks
a visible head. The
adult fly is 1/4 inch
long and resembles a
housefly in color.