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Introduction to Plant Pests. For AgEd 410. Original Created By Margaret Chapman. Spring 1999. Cal Poly, San Luis Obispo Copied from Cal Poly. Modified by Georgia Agriculture Education Curriculum Office June 2002. Four main groups of plant pests:. 1. Weeds. 2. Invertebrates.

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introduction to plant pests

Introduction to Plant Pests

For AgEd 410

Original Created By Margaret Chapman

Spring 1999

Cal Poly, San Luis Obispo

Copied from Cal Poly

Modified by Georgia Agriculture Education Curriculum Office

June 2002

four main groups of plant pests

Four main groups of plant pests:

1. Weeds

2. Invertebrates

3. Vertebrates

4. Disease Agents

plant pests

Plant Pests

* Organisms that compete with people for food or fiber, interfere with raising our crops and livestock.

* Proper identification is important

in controlling pests.

weeds

Weeds

* Adapt well to local

climates and soils and

can compete successfully

with cultivated plants.

* Undesirable plants, sometimes defined as “any plant growing out of place.”

slide5

* Most weeds

produce a large

number of seeds.

* Some weed seeds

can remain dormant

for 20 years before

germinating.

slide6

* Weeds can be persistent and difficult

to eradicate, because some have

vegetative means of reproduction in

addition to seeds.

* Weeds compete with

agricultural crops for

water, nutrients, light

and space.

slide7

* Weeds can interfere with farming

operations, and can harbor insects

and plant diseases.

* Some weeds are toxic to livestock.

slide8

* A simple way to identify

weeds is to compare them

to colored photographs and

drawings.

* Become familiar with

plant classification system

and the weeds physical

features, developmental

stages,and life cycles.

slide9

* We will discuss

weed and other pest

control measures in

upcoming lessons.

slide10

Invertebrate Pests

* Includes insects and their relatives,

nematodes, snails and slugs.

* “Invertebrate” signifies animals

without backbones (no vertebrate).

slide11

* Insects have three body parts: head,

thorax and abdomen and six legs.

slide12

* Ticks, mites and spiders have only

two body parts and eight legs.

Spider

Tick

Mite

slide13

* Nematodes are a large group of

unsegmented worms that can be

plant parasites.

slide14

* Snails and slugs are mollusks that

prefer cool, moist surroundings.

slide15

Vertebrates

* Animals with backbones

* Includes fish ,amphibians, reptiles,

birds and mammals.

* Most of our concern is with birds

and mammals.

slide16

Pest birds

* Harbor pathogens, disease

causing organisms

* Eat or damage crops

* Cause damage to buildings

* Make too much noise

slide17

* Rodents are mammals that interfere

with people, or cause harm to crops

and livestock.

* Animal pests are similar to weeds,

those that are out of place are considered

pests.

slide18

Most of our vertebrate problems

are caused from:

* Rats

* Squirrels

* Mice

slide19

Disease Agents

* Cause disease in plants and animals.

* Many are submicroscopic, making

identification difficult.

* If you can’t see the pest, then it may

be identified by the type of symptoms

caused or damage done.

slide20

* Included in this group of pests are:

1. Bacteria

Bacterial citrus canker

symptoms on citrus leaves

slide21

2. Fungi

* Scab symptoms on

orange fruit caused by the

fungus Elsinoe fawcetti

slide22

3. Viruses

* Citrus tristeza Virus

on grapefruit

* Potato Virus on

veins and shoots

slide23

Problems growers face

* Energy, time and expense to combat

problems.

* Losses of food to our world food supply

can become disastrous.

* Farmers are focusing on controlling

pests while dealing with environmental

pollution problems.

slide24

* New methods and concepts continue to

evolve each day to keep our crops healthy

and abundant.