module 1 field history preparing for field assessment determine your survey approach photo by scott...
Post on 21-Dec-2015
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Module 1
Field HistoryPreparing for field assessmentDetermine your survey approach
Photo by Scott Bauer
Extension agent Wayne Cooley, ARS agronomist Randy Anderson, and farmer Gilbert Lindstrom
Field History
• Ask questions!• Get records, if possible• Make general observations• Learn to detect what might
be causing the problem
Field History
• Previous crop• Chemical history• Planting date• Variety and seed lot• Tillage methods• Soil amendments• Weather• Movement of soil into
field
Preparation for Field Assessment
• Successful diagnosis starts with good preparation
• Keep some useful tools around, and think about the history (as you know it) and nature of the concern
NDSU Extension specialists trained IPM survey scouts in late May
New tools of the survey: Portable computers and Global positioning units.
NDSU Extension specialists trained IPM survey scouts in late May
New tools of the survey: Portable computers and Global positioning units.
Preparation for Field Assessment
• Notepad, record-keeping form or hand-held computers
• Proper clothing, for safety
• Always observe appropriate re-entry intervals (REI)
Preparation for Field Assessment
• Hand lenses magnify tiny features that may be useful
• Common magnifications– 4X– 10X– 16X– 20X
Preparation for Field Assessment Other useful tools
• Trowel• Knife• Plastic baggies• Vial – with alcohol for
insects• Camera – digital/35 mm • Bucket• Sweep net
Determine Survey Approach
• Surveying (or scouting) requires consideration of approach or pattern of travel
• Specific concerns may dictate a certain type of scouting method
• Regardless of method – the goal is to get a representative sample
Determine Survey Approach• Scouting routes may be modified by:
– topography– soil types– irrigation channeling– field entrances
• Regardless of the approach, the goal is to get a representative idea of the problems
Determine Survey Approach
• Scouting in a W or Z pattern for pests or problems distributed uniformly over the field
Examples: Foliar diseases later in season; European corn borer; Pesticide damage
Determine Survey Approach• Scouting or sampling in
areas where pests or damage may be concentrated
Examples:root rots associated with low areas orin patches;cutworms in low, cool areas;white grubs
Determine Survey Approach
Examples: grasshoppers, chinch bug
Pests or damage associated with field borders or waterways