2. 2
CDFA Integrated Pest Control
Mission Statement
To increase the effectiveness of CDFA statewideTo increase the effectiveness of CDFA statewide
weed management program by developing andweed management program by developing and
implementing a standardized weed mapping programimplementing a standardized weed mapping program
that can be integrated on both a local and state level.that can be integrated on both a local and state level.
3. 3
CDFA Integrated Pest Control
Why a Statewide Weed Mapping Handbook?
Develop, implement, evaluate weed management plans
quantitatively on the state and local level
Standardized mapping creates continuity between all WMA
agency and state personnel
Identify noxious weed problem areas, extent of weed
infestations, changes in weed infestations over time, and help
WMAs understand the biology of the invasion process.
Ascertain the economic impact of weed infestations and the
allocation of resources
Increase public awareness and provide the public accurate
information
4. 4
CDFA Integrated Pest Control
Chapter 2: Data Assembly &
Acquisition
Section 1: Overview
Section 2: Hand Mapping
Section 3: GPS Mapping
Section 4: Computer Mapping
Section 5: GIS & Applications
5. 5
CDFA Integrated Pest Control
1. Overview: Noxious Weed Mapping Elements
Weed Mapping Form
Date of survey, scale, and north arrow
Defined survey area (parcel), weed species (color
code), infestation size, and percent ground cover
Note any nearby landmarks or hydrology and
include any cross-street information
Research and map parcel ownership information
and input hand-maps into GIS database
6. 6
CDFA Integrated Pest Control
TLMNO/L
12/06/01
1:24000
TLMNO/L
N
Apn# 063-170-000
Apn# 063-180-000
Apn# 063-190-000
FB-1
2. Hand Mapping
7. 7
CDFA Integrated Pest Control
= Individual plants and Infestations < 1.0 acres
= Infestations between 1.0 and 5 acres
= Infestations > 5 acres, boundary delineated.
= Linear infestations (along roadways, railroads)
Symbols Indicating Infestation Size
8. 8
CDFA Integrated Pest Control
Noxious Weed
WSSA Code and Colors
Common Name Scientific Name WSSA Code Color__
Oblong Spurge Euphorbia Oblongata EPHOB Lime Gr.
Diffuse Knapweed Centaurea diffusa CENDI Lt.Grey
Dalmatian Toadflax Linaria dalmatica LINDA Yellow
Skeleton Weed Chondrilla juncea CHOJU Scarlet
French Broom Genista monspessulana TLNMO Dk. Orange
Purple Loosestrife Lythrum salicaria LYTSA Purple
9. 9
CDFA Integrated Pest Control
Weed Cover Classification
T = Trace, < 1% of
survey area.
L = Low, 1 to 20% of
survey area.
M = Moderate, 20 to
50% of survey area.
H = High, 50-100% of
survey area.
10. 10
CDFA Integrated Pest Control
Section 3: GPS Mapping
Global Position
System Receivers
Determine weed
location
Delineate
infestations in point,
line, and polygon
formats
12. 12
CDFA Integrated Pest Control
Data Sources:
County &
State Databases
Scanning
GPS survey
Input hand
drawn maps
into ArcView
Section 4: Computer Mapping
13. 13
CDFA Integrated Pest Control
Computer Mapping
•Feature Types
•Data Structure & Attributes
•Projection Format
•Metadata
14. 14
CDFA Integrated Pest Control
TLMNO/L
12/06/01
1:24000
TLMNO/L
N
Date
Infestation Size
WSSA Code
Scale
Cover Classification
North Arrow
Apn# 063-170-000
Apn# 063-180-000
Apn# 063-190-000
FB-1
Map Reference
AP# (survey area)
15. 15
CDFA Integrated Pest Control
•Spatial Distribution
-aspect
-elevation
-climate
-soil type
-associations & habitats
• Historical comparisons
•Landuse & Zoning
Section 5: GIS Applications
16. 16
CDFA Integrated Pest Control
Dalmatian
Toadflax
Once mapped,
it was clear
that a
significant
majority of
Paradise
infestations
had south-
facing aspect.
GIS Application: Weed Spatial Distribution
17. 17
CDFA Integrated Pest Control
Purple
Loosestrife
Butte County’s
original Purple
Loosestrife
infestation was
found off
Welsh Road in
1952.
GIS Applications: Historical Comparison
18. 18
CDFA Integrated Pest Control
Purple
Loosestrife
By CDFA’s
June 2001
survey, Purple
Loosestrife had
become a
major weed
infestation in
the lower
Feather River
watershed.
GIS Application: Historical Comparison
19. 19
CDFA Integrated Pest Control
GIS Landuse: Weed Parcel Ownership
21
55
86
0
20
40
60
80
100
Public
Lands
Private
Lands
Union
Pacific
Parcel ownership
NumberofParcels
Parcels
20. 20
CDFA Integrated Pest Control
Resources
1. California Department of Food and Agriculture. Feb 22 2001. Noxious
Weed Index. http://pi.cdfa.ca.gov/weedinfo/NWIcommonname.html.
Sacramento, California.
2. Cooksey, D., Roberts, E., Sheley, R., November 1997, Montana
Noxious Weed Survey and Mapping System, Montana State University,
Bozeman Montana.
3. Ormsby T., Alvi, J. 1999. Extending ArcView GIS. ESRI Corporation.
Redlands, California.
4. Trimble Navigation Limited Surveying & Mapping Division.
December 1996. GeoExplorer II Manual, Sunnyvale, California.
5. Weed Science Society of America. February 2002. Composite List of
Weeds. Allen Press. Lawrence, Kansas.
