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The concept of maximum tolerable levels (mtl) and economic thresholds (et) in pest management. The importance of these levels in decision making and provides a detailed explanation of how ets are calculated using the basic eil model. The document also touches upon the advantages of using thresholds in pest management and mentions some examples of their application.
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but have not defined it.
sure & read his article in the “Reading Assignments”
Maximum Tolerable Level
Time (Weeks)
Pest Population Density
One problem is that we need to allow for management
response time – The time between when a control decision
is made and when it takes effect
Maximum Tolerable Level
Time (Weeks)
Pest Population Density
1 2 3 4 5 6 7 8
Assume it takes 1 week to decide a control is needed, apply it, and for it to work
Decision must be made here
Maximum Tolerable Level
Time (Weeks)
Pest Population Density
1 2 3 4 5 6 7 8
The basic concept is that the EIL is the point at
which the cost of a control = the value of
damage that will be avoided by the control.
Value of damage avoided is a product of:
Crop market value (V)
Pest population density (P)
Injury caused by each pest individual (I)
Damage resulting from that injury (D)
Proportion of total damage that cannot be avoided by the control (K)
eaten by each pest individual/plant ( I )
loss of one bushel/A ( D )
10 % of the crop ( K = 0.1, no units)
V I D K
C
EIL P
'
40 2 1 0. 10
50
EIL
lv/row ft
bu/A
pest/plant
lv/row ft
bu
$
$/A
EIL
pest/plant
1/1/(pest/plant)
EIL Result:
EIL = 6.25 pests/plant
I, D, and K are determined empirically through field
& laboratory experimentation.
C is, for the most part, easily determined.
For most agricultural crops, V is commonly
available.
implement/adopt. Can also be represented in many formats: single numbers, tables, charts.