Transcript Insects

Insect bad guys!
You’ll never look at a bug the same.
Anatomy
3 Body parts
3 pairs=6 legs
Life Cycle-Insect Metamorphosis
• Complete
– Egg
– Larva
(worms/catepillars)
– Pupa (relatively
dormnant)
– Adult (flies, beetles,
etc.)
• Incomplete
– Egg
– Nymph
• early-no wings
• Late-wings developing
– Adult
*Insects must be killed when they are actively feeding
or moving on the plant.
Damage
• Damage depends on the type of mouthpart
• Chewing-tear, chew or grind food
• Sucking:
– Piercing: punctures plant and suck sap
– Rasping: rasps or break surface and suck sap.
• Siphoning: have a coiled tube they dip into liquid food such as
nectar and draw it in (ex. Butterfly)
• Sponging: have two sponge-like structures that collect liquid
food and move it into the food canal. (ex. House fly)
Chewing- Beetles
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Eat leaves
Stems
Flowers
Fruits
Nuts
Beetles
Chewing- Cutworms
• Usually attacks stems
• May eat other plants
Cutworms:
The larvae or caterpillars of some moths are called cutworms
(Agrotis, Amathes, Peridroma, Prodenia spp.) because of the
manner in which they cut down young plants as they feed.
Chewing- Caterpillars
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Larva
Moths
Butterflies
Fuzzy and hair
Eat young leaves and
stems
• Roll up in leaves,
makes leaves curl
Caterpillars
Chewing- Grasshoppers
• Eat all parts of plants
Grasshopper
Sucking
• Puncturing the surface
to take out the sap of a
plant or other animal.
Sucking- Aphids
• Pierce and suck juices
• Plant lice
• Cause stunted growth,
yellow spotted leaves
• Sticky substance and
black mold
• Attracts ants
Aphids
Sucking- Leaf Bugs
• Causes plants to look
unhealthy
• Lose normal color and
wilt
Sucking- Mealy Bugs
• Pierce and suck from
underside of leaves
• Suck in leaf axils
• Causes yellow
appearance
• Sticky secretions
Mealy bug
Sucking- Thrips
• Chews and then sucks
• Causes plant tissue to
become speckled or
whitened
• Leaf tip withers
• Leaf curls and dies
Thrips
Sucking- Whiteflies
• Feeds on underside of
young leaves
• Little flying white
specks when plants are
shaken
White flies
Sucking- Mites (Watch Out it isn’t
an insect)
• Attack underside of
leaf
• Causes leaves to turn
gray to grayish
• Severe infestations
cause webbing
• Insects can be red
Mites
cankerworms
Insect mouthparts
Incomplete Metamorphosis
Complete Metamorphosis