module 9 insects & other garden pests/media/system/5/5/6/4... · 2020. 7. 6. · other garden...
TRANSCRIPT
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Module 9 –Insects & Other Garden Pests
LSU AgCenter Home Gardening Certificate Course
Dr. Joe Willis, Dr. Paula Barton-Willis, Anna Timmerman & Chris Dunaway
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Entomology
1.Entomology is the scientific study of insects. 2.More than one million different insect species have
been described. 3.They are the most abundant group of animals in the
world and live in almost every habitat (not so much in oceans).
4.Less than 1% of insect species are pests and only a few hundred are consistently a problem.
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Basic Insect Classification
Kingdom: Animalia (all animals)Phylum: Arthropoda (all arthropods)
1.Exoskeletons made of chitin2.Highly developed sense organs3.Jointed limbs4.Segmented bodies5.Ventral nervous system. Arthropods’ nervous systems
run along the front of their bodies.6.Bilateral symmetry. This means that the left and right
sides of an arthropod are the same.
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Class: Insecta (only the insects)1. Three pairs of legs2. Three body parts: head, thorax, and abdomen3. Typically two pair of wings; some groups have
one pair or none4. One pair of antennae5. Usually one pair of compound eyes; simple
eyes (ocelli) present in many groups
Basic Insect Classification
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In U.S. and Canada
Order: 28 OrdersFamily: Over 600 Families
Genus: Over 12,500 GeneraSpecies: Over 86,000 species
Basic Insect Classification
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Most of the insects important to gardeners are in 9 orders:
1.Coleoptera – Beetles2.Dermaptera – Earwigs3.Diptera – Flies, Mosquitos, Midges, Gnats4.Hemiptera – Stink Bugs, Leaf-footed Bugs, Aphids, Whitefly, 5.Hymenoptera – Ants, Bees, Wasps,6.Lepidoptera – Butterflies, Moths7.Neuroptera – Lacewings8.Orthoptera – Grasshoppers9.Thysanoptera - Thrips
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Coleoptera – Beetles
1. Four wings; the first pair thickened or hardened.
2. First pair of wings usually as long as abdomen protecting second pair of wings that are membranous.
3. Pair of hardened wings meet a straight line down the back
4. Chewing mouthparts
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Dermaptera – Earwigs
1. Four wings; the first pair thickened or hardened
2. Short wing covers and with abdominal forceps
3. Chewing mouthparts
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Diptera – Flies, Mosquitos, Midges, Gnats
1. One pair of wings; second pair is reduced in size and often not seen
2. Wings membranous, with conspicuous veins.
3. Piercing, sucking or lapping mouthparts
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Hemiptera – Stink Bugs, Leaf-footed Bugs, Aphids, Whitefly
1. Four membranous wings, front wings larger than hind ones.
2. The front wings somewhat translucent or thinner and with veins.
3. Wings held rooflike over abdomen -hoppers.
4. Triangle on back behind the head formed by the wings – true bugs
5. Piercing-Sucking mouthparts
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Hymenoptera – Ants, Bees, Wasps
1. Four membranous wings, front wings larger than hind ones.
2. Hind wings smaller than front wings with few cross veins.
3. Head joined loosely to thorax
4. Chewing mouthparts
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Lepidoptera – Butterflies, Moths
1. Four large wings, covered by scales
2. Siphoning or vestigial mouthparts
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Neuroptera – Lacewings
1. Four membranous wings, front wings larger than hind ones.
2. Their wings are folded flat over the abdomen, or held tent-like over the body
3. Chewing mouthparts
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Orthoptera – Grasshoppers
1. Four wings, front ones somewhat thickened.
2. Jumping hind legs. 3. Hind wings, when
open, spread like fans4. Chewing mouthparts
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Thysanoptera - Thrips
1. Wings with setae or fringes,
2. Sucking mouth parts, usually very small.
3. Some specimens wingless
4. Rasping sucking mouthparts
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Insect Anatomy
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Insect Mouthparts and Feeding Styles
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Insect Life Cycle – Complete Metamorphosis
EggLarva
PupaAdult
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Insect Life Cycle – Incomplete Metamorphosis
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Insect Life Cycle – No Metamorphosis
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Insect Feeding Damage
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Some Commonly Encountered Coleopteran Garden Insect Pests
Mexican Bean Beetle
Colorado Potato Beetle
Flea Beetles
Striped Cucumber Beetle
Pepper Weevil
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Armyworm Tomato HornwormTomato Fruitworm
Cabbage Looper
Some Commonly Encountered Lepidopteran Garden Insect Pests
Corn EarwormSquash Vine Borer
Bean Leaf Roller
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Some Commonly Encountered Hemipteran Garden Insect Pests
Leaf-footed Bug
Squash Bug
Green Stink BugCabbage Aphid
Green Peach AphidWhitefly
Tarnished Plant Bug
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Onion Thrips -Thysanoptera
Vegetable Leafminer - Diptera
Western Flower Thrips - Thysanoptera
Some Commonly Encountered Dipteran & Thysanopteran Garden Insect Pests
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Other Garden Pests – Snails & Slugs
Kingdom: Animalia Phylum: Mollusca
Class: Gastropoda
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Other Garden Pests - Mites
Kingdom: AnimaliaPhylum: Arthropoda
Class: ArachnidaSubclass: Acari
1. Mostly mites have oval-shaped bodies with two body regions that may appear fused together.
2. Mostly mites have piercing sucking mouthparts such as Phytophagous and Predatory mites.
3. Some mites have chewing mouthparts such as Stored grain mites.
4. Mites have 8 legs (4 pairs)
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Other Garden Pests - Mites
1.Worldwide – over 7500 species of plant-feeding mites (Phytophagous)
2.They feed on the leaves, inflorescence and developing plant tissue with piercing-sucking mouthparts
3.Their feeding results in leaf stippling, blotching, curling and twisting4.They may also induce plant gall formation5.All stages of mites except eggs can transmit virus and cause diseases
(e.g. wheat streak mosaic, fig mosaic, tobacco mosaic)6.Certain soil inhabiting mites carry fungal spores causing diseases
like fungal rot of garlic and onion
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Other Garden Pests - Mites
Two-Spotted Spider Mite
Citrus Rust Mite
Red Spider Mite
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Other Garden Pests - Mites
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Other Garden Pests - Nematodes
1.Nematodes are thread-like roundworms that live in a wide range of environments including soil and fresh and salt water.
2.There are species of nematodes that feed on fungi, bacteria, protozoans, other nematodes, and plants.
3.They can also parasitize insects, humans, and animals. 4.Nematodes that feed on plant parts are called plant
parasitic nematodes and are ubiquitous in agricultural soils.
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Other Garden Pests - Nematodes
Tomato
Okra
Lettuce
Root-Knot NematodeKingdom: Animalia
Phylum:NematodaClass: Secernentea
Order: TylenchidaFamily:Meloidogynidae
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