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Insect Pests and Management. OBJECTIVE: Identifying and scouting for common insect pests encountered in the garden and methods of control. Specialists vs. Generalists. _______________________ - insects that attack a small range of plants or within a single plant family.

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insect pests and management

Insect Pests and Management


Identifying and scouting for common insect pests encountered in the garden and methods of control.

specialists vs generalists
Specialists vs. Generalists
  • _______________________ - insects that attack a small range of plants or within a single plant family.
    • Cucumber beetles - cucurbitaceae
    • Tomato hornworm – solanaceae
  • __________________- insects that attack a wide range of plants or many plant families.
    • Grasshopper
    • Aphid
    • Japanese beetle




What do we have for dinner, dear?

Oh, Don’t worry dear!

We have a lot to choose from. They don’t call us the generalists for nothing.

insects that suck
Insects that “Suck!”
  • Small, soft-bodied insects with slender mouth parts, which suck out plant juices.
    • Aphids - attack stems and leaves
    • ____________________ - attack leaves
    • ________________ - attack leaves, flowers, fruit, and other insects
    • Leaf Hoppers - attack leaves of beans, eggplant, and fruit crops
    • White Flies - attack beans, solanaceae, and fruit




insects that chew
Insects that Chew
  • Those insects that chew and digest vegetative and reproductive plant parts.
    • ___________ ______ - attack brassica leaves
    • Cucumber beetle - attack entire cucurbit plants
    • Corn borer - bore into ears of corn
    • Tomato hornworm - attack tomato leaves and fruit
    • _____________ - attack anything and everything
    • Flea beetle - attack leaves of solanaceae, lettuce, and greens
    • Colorado potato beetle - attack leaves of potato and eggplant
insects that chew1
Insects that Chew




a. Colorado Potato


b. Flea beetle

c. Cabbage worm

d. Corn borer

e. Japanese beetle



scouting for insects damaged plants
Scouting for insects: damaged plants?
  • If insects are eating your plants, they leave a distinct ___________________ behind
    • Aphid - sticky, honeydew, and crispy leaves
    • Cucumber beetles - chewed leaves and stems, netted and wilting leaves
    • Flea beetles - pocked, curled leaves
    • ____________________- stippled leaves and webs
    • Thrips - patchy scars on leaves
    • Leaf miners - subsurface discolored leaf trails
    • Caterpillars - chewed leaf margins and fruit
scouting for insects eggs larvae nymphs or adults
Scouting for insects: eggs, larvae, nymphs, or adults?
  • Another way to scout for insects is to observe whether or not they are present in some __________________.
    • Eggs
    • Larvae
    • Nymphs
    • Adults
  • Insects leave “_______________” behind too!
controls beneficial insects
Controls: Beneficial Insects
  • Many insects either parasitize or feed on insects that eat your plants.
    • Parasitic Wasps - attracted to flower pollen and lay their eggs on or within many herbivore eggs and larvae
    • Convergent Lady Beetles - feed on herbivore eggs and larvae, as well as aphids
    • Predaceous Mites - feed on pest mites
    • Green Lacewings - feed on aphids, thrips, and mites
    • Assassin Bugs - attack almost any insect
    • Bigeyed Bugs - attracked to flower nectar and feed on small insects and their eggs
    • Soldier Beetles - feed on aphids
controls beneficial insects1
Controls: Beneficial Insects

Big eyed bug

Assasin bug

Lady bird

Green lacewing

Soldier beetle

controls cultural
Controls: Cultural
  • The environment provided will impact the degree to which pests are a problem.
    • OM
    • Soil Moisture
    • Crop Residues
    • Fertility
    • ________________ Rotation - avoid specific pest colonization
    • Resistant Cultivars - prevent excessive damage
    • Soil Solarization - reduced soil inhabiting pests
    • Pest Barriers - prevent pest access to plants
    • _________________ Planting - lure pests away from crops

Varying these levels will

determine population numbers

of different insects.

controls natural compounds
Controls: Natural Compounds
  • Organic pesticides are derived from naturally occurring substances and control ________________ groups of insects.
    • Bacillus thuringiensis (Bt) - lepidopteran larvae
    • Diatomaceous earth - leaf chewing insects
    • Pyrethrum - cucumber beetles, squash bugs, mealy bugs, moth larvae

Pretty me!

Dalmation chrysanthemums

used for production of pyrethrum

controls natural compounds1
Controls: Natural Compounds
  • Rotenone - beetles, thrips, loopers
  • Insecticidal Soap - white flies, mites, “suckers”
  • Neem - Japanese and other beetles
  • Pepper Wax - aphids, leaf hoppers, flea beetles
controls synthetic compounds
Controls: Synthetic Compounds
  • Many insecticides are synthetically derived and can control a _____________ spectrum of insects - dependent on dosage.
  • Most synthetic insecticides are recommended by ___________________ rather than by ____________________ due to their full spectrum effectiveness.
  • Issues include: hazard, toxicity, restricted use
    • Sevin - controls many insects at various stages; toxic to honey bees
    • Pounce - several worms and beetles
    • Lorsban - aphids, worms, maggots