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Weeds: Friends or Foes?. Original Power Point Created by Danny Silva. Modified by the GA Agricultural Education Curriculum Office July 2002. Weeds: Benefits. Weeds are controversial plants that are neither all good nor all bad, depending on one’s outlook.

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weeds friends or foes

Weeds: Friends or Foes?

Original Power Point Created by

Danny Silva

Modified by the GA Agricultural Education Curriculum Office

July 2002

weeds benefits
Weeds: Benefits
  • Weeds are controversial plants that are neither all good nor all bad, depending on one’s outlook.
  • 1. Many weeds can be enjoyed for their attractive flowers and interesting seed pods.
  • 2. Weeds quickly grow
  • to cover unsightly scars
  • on the landscape made
  • by man or by nature.
harmful weeds
Harmful Weeds
  • 1. Weeds reduce crop yield and increase the cost of production.
  • 2. Some weeds are poisonous and others may cause allergies.
don t let weeds ruin your day
Don’t Let Weeds Ruin Your Day!

For a farmer or gardener to do an effective job of controlling troublesome weeds, exact identification of the weed is important.

The selection of the most effective control method depends on one’s ability to properly identify the problem species.

identification is the key
Identification Is The Key
  • The purpose of a weed collection is to help the person making the collection more adept at identifying weeds:
  • 1. A simple way to begin identifying common weeds is to compare your specimens against drawings and colored photographs from references.
identification is the key cont
Identification Is The Key (cont.)

a. The use of weed keys, such as those found in field guides and references, do require a specialized knowledge of weeds.

b. Specialists like farm advisors, agricultural commissioners, or college/university faculty can be contacted for help with identifying plant species.

weed classification
Weed Classification
  • II. The classification of weeds is achieved by grouping together those weeds whose similarities are greater than their differences.

a. Most weeds can be placed into two convenient groups: narrow-leafed or broad-leafed.

      • 1) Narrow-leafed weeds include: grasses, sedges, rushes and cattails. All have parallel veins running throughout their leaves.
      • 2) Broad-leafed weeds include: most others, such as mustards, dock, pigweed, purslane, and morning glory. All have a net-like pattern of veins running throughout the leaves.
weed classification cont
Weed Classification (cont.)

b. Like other plants, weeds have varying types of life cycles:

  • 1) Annual weeds live for one year or less.
  • 2) Biannual weeds live for two growing seasons.
  • 3) Perennial weeds live for 3 or more years.
what s your name
What’s Your Name?

c. Weeds have unique physical features which can be used for identification.

  • 1) Flowers and certain sexual reproductive organs vary among species:

a) Flowers can appear singly or as a compound inflorescence.

b) Different names such as catkin, head, panicle, raceme, spike, and umbel describe how flowers are arranged in an inflorescence.

c) The arrangement, shape, vein patterns, or presence of hairs/spines on leaves may vary between species.

what s your name cont
What’s Your Name? (cont.)

d) Stem variations such as rhizomes, stolons, and tubers are helpful in identification.

e) Taproots of the broad-leafed weeds differentiate them from the fibrous roots of grasses.

f) The fruits and seeds of weeds are all unique in their shape, size, markings, and color.

the cotyledon stage
The Cotyledon Stage
  • III. It is especially helpful to identify weeds while they are in the cotyledon stage because:
  • a. The weed can be controlled before it competes with the crops.

b. Control measures are more effective and less costly when the weeds are treated during this immature stage of their life cycle.

a chance to practice
A Chance To Practice
  • IV. The following 25 slides are examples of several common weeds:
    • The first line is the common name.
    • The second line is the scientific name.
    • The third line gives the life cycle.
    • The fourth line is the growing season.
slide13

Annual Bluegrass

Poa Annua

Annual

Cool season

slide14

Bermuda Grass

Cynodon dactylon

Perennial

Dormant in

the cool season

slide15

Bristly Oxtongue

Picris echioides

Biennial

slide16

Broadleaf Plantain

Plantago major

Perennial

slide17

Bur Clover

Medicago

polymorpha

Annual

Cool season

slide18

Cheeseweed or

Mallow

Malva parviflora

Biennel

slide19

Common Goundsel

Senecio vulgaris

Annual

Cool season

slide20

Crabgrass

Digitaria ischaemum

Annual

Warm season

slide21

Cudweed or

Cotton Batting

Gnaphalium chilense

Biennial

slide22

Curly Dock

Rumex crispus

Perennial

slide23

Dandelion

Taraxacum officinale

Perennial

slide24

Fennel

Foeniculum vulgare

Perennial

slide25

Filaree

Erodium spp.

Annual

Cool season

slide26

Knotweed

Polygonum aviculare

Annual

Warm season

slide27

Lambsquarters

Chenopodium album

Annual

Warm season

slide28

Narrowleaf Plantain

Plantago lanceolata

Perennial

slide29

Oxalis

Oxalis spp.

Perennial

slide30

Petty Spurge

Euphorbia peplus

Annual

Cool season

slide31

Prostrate Spurge

Euphorbia maculata

Annual

Warm season

slide32

Purslane

Portulaca oleraceae

Annual

Warm season

slide33

Scarlet Pimpernel

Anagallis arvensis

Annual

Cool season

slide34

Shepherd’s Purse

Capsella bursa-paston’s

Annual

Cool Season

slide35

Sow Thistle

Sonchus oleraceus

Annual

Cool season

slide36

Yellow Mustard

Brassica species

Annual

Cool season

slide37

Yellow Nutsedge

Cyperus esculentus

Perennial