364.T1

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Damage Caused By Plant Pests

Fungi

• Fungi are microscopic plants which lack chlorophyll and conductive tissue.

• They cause:

- Stem rust - Brown rot

- Corn smut - Damping off

- Powdery mildew

364.T2

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Damage Caused By Plant Pests

Fungi Life Cycle

Spore Production:

364.T3

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Damage Caused By Plant Pests

Bacteria

• Bacteria are microscopic single-celled organisms.

• They cause:

- Galls - Scabs

- Leaf spots - Systemic disorders

- Soft rots

364.T4

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Damage Caused By Plant Pests

Bacteria Life Cycle

Division:

364.T5

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

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.

364.T6

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Damage Caused By Plant Pests

Nematode

Excretory Pore

Spear

Esophagus

Gut orIntestine

Anus

Ovary

VulvaOvary

364.T7

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Damage Caused By Plant Pests

Nematode Damage

This type of nematodefeeds and moves outside of roots throughout its life.

364.T8

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

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)..

364.T9

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Damage Caused By Plant Pests

Virus Life Cycle

Synthesis:

(A virus needs to be inside a living cell to multiply.)

364.T10

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Damage Caused By Plant Pests

Other Invertebrate Pests

Sucking Insects

Chewing Insects

Mites

364.T11

Model Agricultural Core Curriculum: SupplementUniversity of California, Davis

Damage Caused By Plant Pests

Other Invertebrates Pests (cont’d.)

Snail Slug

Centipede Millipede