1 of 16

Measurements: Leaves and Growth

​

2 of 16

LEARNING OBJECTIVES

​

  1. Learn how to count and measure leaves.

​

  • Learn how to properly measure stem height.

​

  • Learn how to measure plant senescence.

​

3 of 16

KEY TERMS

​

  • Term 1
  • Term 2
  • Term3
  1. True Leaves

4 of 16

Alternate Scale:

% Leaves Damaged

0=0%,

1=1-5%,

2= 5-25%, 3=25-50%, 4=50-75%, 5=75-99%,

6=100%

  1. Damaged Leaves

5 of 16

KEY TERMS

​

  • Term 1
  • Term 2
  • Term3

TIME FOR A QUIZ!

6 of 16

KEY TERMS

​

  • Term 1
  • Term 2
  • Term3

Answers

7 of 16

2. Stem Height

8 of 16

KEY TERMS

​

  • Term 1
  • Term 2
  • Term3

3. Senescence

Senescence

% of Stem with Leaves

0=no leaves,

1= <25% of nodes with leaves

2= >25% of nodes with leaves

9 of 16

KEY TERMS

​

  • Term 1
  • Term 2
  • Term3

3. Senescence

Dominant Leaf Color

1=Green,

2=Yellow

3=Brown (typically crunchy)

NA=No leaves

​

Senescence

10 of 16

KEY TERMS

​

  • Term 1
  • Term 2
  • Term3

TIME FOR A QUIZ!

% of Stem with Leaves

0=no leaves,

1= <25% of nodes with leaves

2= >25% of nodes with leaves

Leaf Color

1=Green,

2=Yellow

3=Brown (typically crunchy)

NA=No leaves

​

11 of 16

KEY TERMS

​

  • Term 1
  • Term 2
  • Term3

TIME FOR A QUIZ!

% of Stem with Leaves

0=no leaves,

1= <25% of nodes with leaves

2= >25% of nodes with leaves

Leaf Color

1=Green,

2=Yellow

3=Brown (typically crunchy)

NA=No leaves

​

12 of 16

Self-Assessment

I struggle to do any of this

I can do some of this

I can do all of this

  • Learn how to count and measure leaves.

​

  • Learn how to properly measure the length and width of the largest leaf

​

  • Learn how to properly measure stem height.

13 of 16

NEXT STEPS...

  1. Video:

• Phenology and Herbivory Project→ Video 4.2

• Herbivory Bioassay→Video 5

​

  1. Phenology Protocols:

• Phenology and Herbivory

• Herbivory Bioassays

14 of 16

IMAGE CREDITS

Asclepias syriaca: Tyler Arboretum, 2007

(https://en.wikipedia.org/wiki/Asclepias_syriaca#/media/File:Common_Milkweed_Asclepias_syriaca_Plant_2000px.jpg)

​

Leaf spots photos: Olivia Sullivan and Emily Mohl

​

Tussock moth larvae photos: by Alison Hunter (left) and Mary Anne Borge (right)

​

​

Additional images used were taken by Emily Mohl and Alex Lien

15 of 16

VIDEO CREDITS

Narrated by Madelyn Wood

​

Written by Ben Anderson, Miranda Lentz, Madelyn Wood, and Emily Mohl

​

Also aided by Elsa Anderson, and Christiana Cholakis

​

Technical Consultation with Ben Gottfried

​

​

This work is supported in part by the St. Olaf Collaborative Undergraduate Research and Inquiry Program and by NSF-DEB-Award 1936621

16 of 16