Pests & Diseases
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Transcript of Pests & Diseases
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Pests & Diseases
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Insects - Anatomy Insects
Small animals that have three body regions and three pairs or six legs.
The three body regions are…. Head Thorax Abdomen
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Parts of the Insect
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Life Cycle of Insects
Complete metamorphosisEggLarva Worm Caterpillar
PupaAdult Flies Beetles
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Life Cycle of Insects
Incomplete metamorphosisEggNymphAdult
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Chewing Insects
BeetleEat leaves, stems,
flowers, fruit and nuts.
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Chewing Insects
CutwormsUsually attack stems,
but may eat other plant parts.
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Chewing Insects
Caterpillars Larva of moths and butterflies and are fuzzy or hairy. Eat young leaves and stems. Roll up in leaves making the leaves curl.
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Chewing Insects Grasshoppers
Eat all parts of plants.
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Sucking Insects
AphidsPierce & suck juices.Known as plant lice.Cause stunted growth
and yellow spotted leaves.
Causes sticky substance and black mold which attracts ants.
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Sucking Insects
MealybugsPierce and suck from underside of leaves and in leaf
axils.Causes yellow appearance and sticky secretions.
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Sucking Insects
WhitefliesFeed on underside of
young leaves causing yellowing.
They will look like flying little white specks when plants are shaken.
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Plant Diseases
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What is a Disease??? A plant disorder caused by an infectious pathogen or agent.
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Conditions Needed for a Disease Three conditions are necessary for a disease in a plant.
Host plant Disease causing organism or pathogen must be present. Favorable environment for disease organism to develop.
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The Disease Triangle
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What Causes a Disease?? The groups of pathogens are….
Bacteria Fungi Viruses Parasitic plants
Mistletoe Dodder Lichens
FUNGI
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Parasitic Plants
LICHENSMISTLETOE DODDER
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Controlling DiseasesWarm temperatures and moist conditions in
greenhouse plant production make most horticulture plant diseases worse because…. Environmental conditions that support disease-causing
pathogens.Preventing plant diseases is better than treating
the diseases.Plant diseases must be identified before they can
be treated.
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Plant Diseases – Blight
Cause plants to quickly turn brown as if they had been burned.
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Plant Diseases – Canker
Causes open wounds on woody plant stems.
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Plant Diseases – Damping Off
A fungal disease that causes young plants and seedlings to rot off at the soil level.
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Plant Diseases – Galls Round swellings or growths on plants.
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Plant Diseases – Leaf Spots
Rings of different shades of brown, green, or yellow that make spots on leaves.
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Plant Diseases – Mildew
Grows on leaf surfaces (both upper & lower) as white, gray or purple spots.
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Plant Diseases – Mosaic
Caused by viruses that make the leaves have irregular mottled areas with patterns ranging from dark green to light green to yellow to white.
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Plant Diseases – Rot
Causes plants to decay & die.
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Plant Diseases – Rust
Causes small spots on leaves that resemble yellow, orange, brown or red rust mainly on the underneath side of leaves.
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Plant Diseases – Smut
A black powdery disease that causes blisters that burst open releasing black spores.
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Plant Diseases – Wilts
Disease that blocks the uptake of water in plants stems causing it to wilt.