Damage Caused By Plant Pests
Fungi
• Fungi are microscopic plants which lack chlorophyll
and conductive tissue.
• They cause:
- Stem rust
- Corn smut
- Powdery mildew
Model Agricultural Core Curriculum: Supplement
University of California, Davis
- Brown rot
- Damping off
364.T1
Damage Caused By Plant Pests
Fungi Life Cycle
Spore Production:
Model Agricultural Core Curriculum: Supplement
University of California, Davis
364.T2
Damage Caused By Plant Pests
Bacteria
• Bacteria are microscopic single-celled organisms.
• They cause:
- Galls
- Leaf spots
- Soft rots
Model Agricultural Core Curriculum: Supplement
University of California, Davis
- Scabs
- Systemic disorders
364.T3
Damage Caused By Plant Pests
Bacteria Life Cycle
Division:
Model Agricultural Core Curriculum: Supplement
University of California, Davis
364.T4
Damage Caused By Plant Pests
Nematodes
• Nematodes are very small non-segmented worms.
• Nematodes cause:
- Galls on roots.
- Root lesions.
- Injured root tips.
- Lower yields.
- Excessive root branching. - Decreased plant health.
Model Agricultural Core Curriculum: Supplement
University of California, Davis
364.T5
Damage Caused By Plant Pests
Nematode
Gut or
Intestine
Excretory Pore
Esophagus
Anus
Ovary
Spear
Vulva
Model Agricultural Core Curriculum: Supplement
University of California, Davis
Ovary
364.T6
Damage Caused By Plant Pests
Nematode Damage
This type of nematode
feeds and moves
outside of roots
throughout its life.
Model Agricultural Core Curriculum: Supplement
University of California, Davis
364.T7
Damage Caused By Plant Pests
Viruses
• Pathogenic particles which infect higher plants and
animals.
• Viruses can only multiply in living cells.
• Viruses cause:
– Stunting of plants.
– Yellow mosaic patterns on leaves.
– Flower break.
– Vein clearing (chlorosis of leaves)..
Model Agricultural Core Curriculum: Supplement
University of California, Davis
364.T8
Damage Caused By Plant Pests
Virus Life Cycle
Synthesis:
(A virus needs to be inside a living cell to multiply.)
Model Agricultural Core Curriculum: Supplement
University of California, Davis
364.T9
Damage Caused By Plant Pests
Other Invertebrate Pests
Sucking Insects
Chewing Insects
Mites
Model Agricultural Core Curriculum: Supplement
University of California, Davis
364.T10
Damage Caused By Plant Pests
Other Invertebrates Pests (cont’d.)
Snail
Slug
Millipede
Centipede
Model Agricultural Core Curriculum: Supplement
University of California, Davis
364.T11