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. Complete Metamorphosis Incomplete Metamorphosis 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. Damage • 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) Insect mouthparts Chewing • Tear, chew or grind food • Controlled by stomach poisons Chewing- Beetles • • • • • 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 • Larva of Moths & Butterflies • Fuzzy and hairy • Eat young leaves and stems • Roll up in leaves, makes leaves curl Caterpillars Chewing- Grasshoppers • Eat all parts of plants Grasshopper Chewing- Bagworm • Attack during larvae stage • Leave brown spots on upper epidermis • Eat entire leaves on older plants Bagworm Sucking • Puncturing the surface to take out the sap of a plant or other animal. • Controlled by systemic control Videos!!!! • Incomplete Metamorphosis • Complete Metamorphosis 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- Lace Bug • Suck on underneath side but damage is noticed on upper part of the leaf as large yellow spots Lace Bug Sucking-Scale • Suck juices from stems and other parts of the plant • Cause plant as a whole to look unhealthy and stop growing • Secretes honeydew that attracts the fungus, sooty mold • Mealy bugs are a type of scale Scale 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 Controlled by a miticide Mites cankerworms