basics of entomology
DESCRIPTION
its very good introductory book on entomology.TRANSCRIPT
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Basics of Entomology
Brandi Ashley
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Entomology
Entomology is the study of insects
There are more than 100,000 different of
species of insects in North America.
In the typical yard there can be a 1,000+
insects at any given time
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The Role of Insects
Pollinate food crops, fruits and
vegetables
Provide food for birds, fish and humans
Produce useful products like honey, wax,
silk and shellac
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Negative Impact
While only 3% of insects are labeled
“pests” the negative impact on humans is
significant.
Crop Damage (both plant and animal)
Defoliate
Shade loss/ destruction
Transmit disease
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Classification of Insects
Insects are classified using binomial
nomenclature, a 2-word naming system
used to classify organisms.
This scientific name consists of a genus
and species.
Scientific names can be written in italics,
first word capitalized, second in
lowercase and can be underlined and
abbreviated.
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Scientific Names
Example: Red Oak
Can be written
Quercus rubra
Q. rubra
Quercus rubra
Q. rubra
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Classification Hierarchy
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Animal Kingdom
The Animal Kingdom has many divisions,
phyla, that contain agricultural pests:
Arthropoda ( insects, spiders, crayfish,
millipedes)
Aschelminthes ( roundworms, trichina)
Platyhelminthes (flatworms, flukes,
tapeworms)
Mollusca (snails, slugs, clams)
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Arthropoda
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Aschelminthes
(Round Worms)
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Platyhelminthes
( Flatworms)
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Mollusca
(Mollusks)
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Insects
Insects are in the phylum Arthropoda.
Arthropods are extremely important
groups of animals, representing ¾ of the
known species that exist.
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Classes of the Phylum Arthropoda
Table 6-1
Contains the following information:
Classes
Examples
Body Segments
Pairs of Legs
Agricultural Importance
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Orders of the Class Insecta
Table 6-2
Contains the following information:
Order
Common Name
Metamorphosis (note- complete & incomplete)
Mouthparts
Wings
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Insect Form & Structure
pg. 3
All adult members of the class Insecta
possess
3 body regions (segmented)
3 pairs of legs (often modified to suit the
environment)
1 pair of antennae
0-2 pairs of wings
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Insect Body
The body of an insect
has 3 distinct body
regions (Fig. 6-1)
Head
Thorax
Abdomen
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Body Covering
An insect’s body is not supported by a
bony skeleton but a tough body wall or
exoskeleton.
The exoskeleton contains a cuticle-like
layer of wax that determines permeability
or drying.
The cuticle contains segments, sutures, or
plates, that allow flexibility.
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Head
An insect head
contains:
Eyes (simple
(ocellus) &
compound)
Mouth Parts
Antenna
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Thorax
An insect thorax:
Point of attachment
for legs and wings
Most of the insect
muscles
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Abdomen
An insect abdomen:
11-12 segments
(often hard to
distinguish)
Reproductive organs
Modified
appendages for egg
laying
Spiracles
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Eyes
Eyes can be
Compound
Simple
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Legs
The most important
characteristic of an
insect is the
presence of 3 pairs
of jointed legs
Almost always
present in adult form
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Insect Legs
(fig. 6-2)
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Wings
(fig. 6-3)
Venation (the
arrangement of veins
in wings) is different
in different species
Key in identification
Name indicates the
wing shape
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Antennae
Segmented
Vary greatly in form and complexity
Primarily organs of smell, often modified
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Antennae
( fig. 6-4)
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Mouthparts
(fig. 6-5)
An insect’s most
complicated and
remarkable feature is
its mouth.
Divided into 2 broad
categories- chewing
and sucking
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Mouthparts
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Insect Metamorphosis
(pg. 6)
In humans, most of the important development takes before birth, in insects it occurs after birth or egg hatch.
The immature period of an insect is primarily one of growth, feeding, and storing food for the pupal or adult stages that follow.
Many insects feed very little during their adult life.
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Insect Metamorphosis
(Fig. 6)
Some insects do not
go through
metamorphosis, but
rather a gradual
increase in size.
Ex. silverfish
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Insect Metamorphosis
Gradual
Metamorphosis
Going through a
nymph stage
Egg-Nymph-Adult
In some cases,
union of egg and
sperm, this is called
parthenogenesis.
Ex. Grasshopper
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Incomplete Metamorphosis
Much like gradual,
but the immature
form doesn’t always
resemble adult as in
a dragonfly
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Complete Metamorphosis
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Complete Metamorphosis
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Complete Metamorphosis
Egg- Beginning stage deposited by the adult
Larva- Usually worm-like that grows rapidly
Pupa- period of profound change, transition to
adulthood, tissues and structures are broken
down and new ones form
Adult- a period of reproduction, little or no
growth, food is entirely different than during
the larval stage
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Identifying Insects
pg. 7
Most of us home gardeners classify an insect by the common name, like beetle, wasp, butterfly and bee.
The ability to classify an insect to the order level gives the gardener access to specific and valuable information
Ex. Knowing info about mouthparts of an insect can tell us how it feeds and possible methods to control it
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Specific Insect Orders
Insects are divided into 3 sections
1. Insects important to the gardener
2. Insects of lesser importance
3. Common “non-insect” period
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Insect Orders
Important to the Gardener
Coleoptera- pg. 6
Ex. Beetles, Weevils
Adults
hardened
exoskeleton
2 pair wings, outer
hardened inner
Chewing mouthparts
Prominent antenna
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Order Coleoptera
(fig. 6-7)
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Coleoptera Life Cycle
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Order Dermaptera
(fig. 6-8)
Ex. Earwigs
Moderate size adults
Chewing mouthparts
Modified abdomen
pinchers that are like
forceps
Nymphs similar to
adults
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Order Diptera
(fig. 9)
Order Diptera
Ex. Flies, mosquitoes, gnats, midges
Adults
Only one pair of wings, soft, hairy
Mouthparts sponging (fly) or Piercing (mosquito)
Advanced larval forms, maggot, mosquito
Complete metamorphosis
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Order Hemiptera
(Fig. 6-10)
Ex. Stinkbug, bedbug
boxelder beetle, squash
Grad. Metamorhposis
2 pair wings
Adults and nymphs similar
Piercing/sucking mouth
Adult and nymph both damaging
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Order Hemiptera
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Order Homoptera
(fig. 6-11)
Ex. Scale insects, cicada, aphids,
leafhoppers
Both winged and unwinged forms
All non-egg stages have sucking
mouthparts
Gradual metamorphosis
Many are carriers of plant pathogens
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Order Homoptera
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Order Hymenoptera
(fig. 6-12)
Ex. Bees, mud dauber, wasp, ant
Adults have 2 pair of membranous wings
Larva have no legs or 3 pairs of legs on
the abdomen
Usually chewing mouthparts
Complete metamorphosis
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Order Hymenoptera
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Order Lepidoptera
(fig. 6-13)
Ex. Butterflies, moths
Soft bodied adults, well-developed wings
Larva have chewing mouthparts,
caterpillars are voracious eaters
Adults have coiled, sucking mouthparts
Complete metamorphosis
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Order Lepidoptera
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Order Neuroptera
(fig. 6-14)
Ex. Lacewings,
dustywings
Insect predators
2 pairs of
membranous wings
Chewing mouthparts
Complete
metamorphosis
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Order Orthoptera
(fig. 6-14)
Ex. grasshopper, cricket, walkingstick, mantis,
katydid
Adults are large, hard-bodied
Simple metamorphosis, egg-nymph-adult
Adults have 2 pairs of wings, forewings are
hardened, hind-wings are membrane
Chewing mouthparts
Immature species resemble wingless adults
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Order Orthoptera
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Order Thysanoptera
(fig. 6-16)
Example- Thrips
Small, soft bodied
Mouthparts- piercing
or sucking
Varied
metamorphosis
Found on plants and
flowers
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Insects of Lesser Importance
pg. 11
See pg. 11
These insects have little impact on
gardeners
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Common Non-Insect
Arachnida (fig.6-17)
Ex. Spider mites, spider, tick
Small, soft-bodied with 2 body regions
Many are beneficial predators
Many spread disease
Many are parasitic
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Arachnids
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Order Diplopoda
(fig. 6-18)
Ex. Millipedes
Elongated bodies
2 pairs of legs per
segment
Destructive to
vegetables, feed on
fungus and decaying
plant
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Order Chilopoda
(fig. 6-19)
Ex. Centipedes
Highly segmented
1 pair of legs per
segment
Beneficial predators
Aggressive
carnivores
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Order Crustacea
(fig. 6-20)
Ex. Sowbugs, pillbugs
Covered with hard,
convex, outer shell,
number of plates
Highly dependent on
moisture
Feed on decaying
wood and young
plants
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Types of Insect Injury
pg. 13 (fig. 6-21)
Chewing Insects
Easy to see
Defoliation
Even small amount of damage can been devastating
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Types of Insect Injury
pg. 13 (fig. 6-21)
Piercing-Sucking
Insects
Boring insects
Often advanced
before aware
Symptoms include
wilting, sap
excretion, deformed
fruit, spotting
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Types of Insect Injury
pg. 13 (fig. 6-21)
Internal Feeders
Lay eggs in plants,
feed and cause
destruction
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Subterranean Insects
pg. 14
Attack from below
the surface
Interfere with root
development and
cause root decay
Ex. corn rootworm
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Laying Eggs
Many species lay
eggs in root systems
and young wood
Eggs impede growth
and use nutrients
Galls form and
destroy shoots
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Use of Plants for Nests
Use plant material to
build nests
Ex. Leaf cutter ants
and bees
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Insect-Vectored Diseases
pg. 14
Insects my spread disease in the following ways:
Feeding, laying eggs, or boring into plants,
creating entrance points for disease
Carry disease on their body and inject it as
they feed
Emit caustic agents that cause damage
Host in a pathogens life-cycle
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Beneficial Insects
pg. 16
Benefit gardener by:
Aid in production of food- pollination
Destroy competitors of beneficial plants
Improve physical conditions in the soil
Scavengers
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Minimizing Chemical Control
pg. 16
Soil preparation
Plant selection
Rotating crops
Inter-planting
Thinning
Watering
Timing planting
Sanitation
Staking
Injury prevention
Mulching
Controlling weeds
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Mechanical Controls
Handpicking- look for egg clusters,
worms and beetles
Traps
Barriers-aluminum foil, plastic
Exclusion- covers, cheesecloth, etc.
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Biological Controls
Predators, parasites,
and pathogens
Natural predators
Ex. preying mantis,
ladybugs, lacewings
and ground beetles
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Controls
pg. 19
Nonsynthetic
Pesticides
Botanicals
Soaps
Home remedies
Synthetic Pesticides
See attached