Revisiting the Economic Injury Level and Economic Threshold Model for Potato Leafhopper (Hemiptera: Cicadellidae) in Alfalfa

2015 ◽  
Vol 108 (4) ◽  
pp. 1748-1756 ◽  
Author(s):  
Elissa M. Chasen ◽  
Dan J. Undersander ◽  
Eileen M. Cullen
Keyword(s):  
Threshold Model ◽  
Potato Leafhopper ◽  
Economic Injury Level ◽  
Economic Threshold ◽  
Economic Injury

THE DYNAMICAL BEHAVIOR OF NON-SMOOTH SYSTEM WITH IMPULSIVE CONTROL STRATEGIES

2012 ◽  
Vol 05 (03) ◽  
pp. 1260018 ◽  
Author(s):  
YUAN-SHUN TAN ◽  
JU-HUA LIANG ◽  
SAN-YI TANG
Keyword(s):  
Impulsive Control ◽  
Control Strategies ◽  
Dynamical Behavior ◽  
Economic Injury Level ◽  
Economic Threshold ◽  
Pest Population ◽  
Different Types ◽  
Economic Injury ◽  
The Given ◽  
Smooth System

Non-smooth system including impulsive strategies at both fixed and unfixed times are analyzed. For the model with fixed impulsive effects, the global stability of pest eradication periodic solution and the dominance of dynamic behavior are investigated. This indicates that the model with fixed moments has the potential to protect the natural enemies from extinction, but under some conditions may also serve to extinction of the pest. The second model is constructed according to the practices of IPM, that is, when the pest population reaches the economic injury level, a combination of biological, cultural, and chemical tactics that reduce pests to tolerable levels is used. Numerical investigations imply that there are several different types of periodic solutions and their maximum amplitudes are always less than the given economic threshold. The results also show that the time series at which the IPM strategies are applied are quite complex, which means that the application and realization of IPM in practice are very difficult.

Life table and economic threshold concept for ecologically sustainable management of Diacrisia casignetum Kollar (Lepidoptera: Arctiidae) on Jute

ENTOMON ◽  
2019 ◽  
Vol 44 (2) ◽  
pp. 103-110
Author(s):  
Nayan Roy
Keyword(s):  
Life Table ◽  
Demographic Data ◽  
Intrinsic Rate ◽  
Natural Increase ◽  
Economic Injury Level ◽  
Economic Threshold ◽  
Potential Fecundity ◽  
Rate Of Increase ◽  
Economic Injury ◽  
Ecologically Sustainable

Life table and economic threshold (ET) level of Diacrisia casignetum Kollar on jute was calculated in West Bengal condition during 2016-2018 for environmentally benign management and better production of jute. The demographic data of D. casignetum always construct type-III survivorship curve like most of the insects. Potential fecundity (Pf) and total fertility rate (Fx) were 384.667±5.487 and 30893.60±1063.586, respectively. The average intrinsic rate of natural increase (rm) and the daily finite rate of increase (ë) were 0.106±0.001 and 1.111±0.003 respectively with the generation time (Tc) of 41.520±0.069 and doubling time (DT) of 6.563±0.021 days. Their mean population momentum factor of increase (PMF) was 19.676±0.605 including vital index (VI) and trend index (TI) of 0.522±0.003 and 92.359±2.648, respectively with different levels of significance. The economic injury level (EIL) and ET based on percent yield loss of jute were 7.119±2.166 and 6.385±1.969 pests per plant, respectively. At single pest observation per plant, the possible time taken to reach EIL (Ti) and ET (Tt) were 6.377±3.292 and 5.377±3.292 days, respectively which will be useful for better cultivation of jute and other subsequent crops.

A Re-Examination of Economic Injury Levels for Potato Leafhopper (Homoptera: Cicadellidae) on Soybean2

2000 ◽  
Vol 35 (2) ◽  
pp. 97-104 ◽  
Author(s):  
Thomas E. Hunt ◽  
Leon G. Higley ◽  
Larry P. Pedigo
Keyword(s):  
United States ◽  
Curve Fitting ◽  
Yield Loss ◽  
Leaf Tissue ◽  
Economic Conditions ◽  
Potato Leafhopper ◽  
Eastern United States ◽  
Economic Injury Level ◽  
Calculation Methodology ◽  
Economic Injury

The potato leafhopper, Empoasca fabae (Harris), is an occasional pest of seedling soybean throughout the eastern United States. Economic injury levels (EIL) for E. fabae on soybean are not available for all vulnerable soybean stages, nor do they reflect current understandings of soybean response to injury or EIL calculation methodology. Damage terms were estimated for seedling soybean stages using curve-fitting techniques that consider the vulnerability of the expanding leaf tissue of seedling soybean. Yield loss for stage V1 soybean was 43.58 kg/ha/E. fabae/plant, for V2 was 20.41 kg/ha/E. fabae/plant, for V3 was 13.10 kg/ha/E. fabae/plant, and for V4 was 9.55 kg/ha/E. fabae/plant. Economic injury level matrices were developed to reflect changing economic conditions and management costs for V1 through V4 soybean. The EILs are 1.4 to 3.6 E. fabae/plant for V1 soybean, 3.0 to 7.8 E. fabae/plant for V2 soybean, 4.7 to 12.2 E. fabae/plant for V3 soybean, and 6.5 to 16.7 E. fabae/plant for V4 soybean.

scholarly journals Economic Injury Level of Canjiqueira in Native Pastures in Pantanal of Nhecolândia

2019 ◽  
Vol 37 ◽  
Author(s):  
C. BERSELI ◽  
J.A.M. BONO ◽  
S.A. SANTOS ◽  
F.A.R. PEREIRA ◽  
J.F. REIS NETO
Keyword(s):  
Threshold Level ◽  
Human Intervention ◽  
Effective Management ◽  
Economic Injury Level ◽  
Economic Threshold ◽  
Shrub Species ◽  
Invasive Shrub ◽  
Economic Injury ◽  
Native Pastures ◽  
Livestock System

ABSTRACT: Pantanal plain has large extensions of land formed by many types of landscapes suitable to extensive livestock system. Open grasslands and lowlands are formed by forage such as grasses and forbs widely consumed by cattle. However, climatic and human factors can promote the dissemination of invasive shrub species such as canjiqueira (Byrsonima cydoniifolia A. Juss) making it necessary, in many cases, the human intervention to control the invasion. The present work had as objective to determine the economic threshold level to control canjiqueira through two methods: tractor driven blade and link chains pulled by tractor in different invasion levels plants per hectare. Economic Threshold proved to be a tool for efficient and effective management for making decisions of when and how to do the control of canjiqueira in natural pastures of Pantanal of Nhecolândia.

scholarly journals PENETUAN ALE DAN AE LARVA LEPIDIOTA STIGMA F PADA TANAMAN TEBU

2014 ◽  
Vol 3 (2) ◽  
Author(s):  
Alimin, Edhi Martono, dan Witjaksono
Keyword(s):  
Biological Control ◽  
Light Trap ◽  
The Other ◽  
Economic Injury Level ◽  
Economic Threshold ◽  
Other Hand ◽  
Economic Injury ◽  
Weight Proportion

This research was conducted to determine the value of Economic Injury Level (EIL) and Economic Threshold (ET) for the larvae of Lepidiota stigma instar 1, 2 and 3 in three different locations. The amount of larvae population and plant per m2 in the field, and the weight proportion of the vanished root or to-be-eaten by a larva were needed to determine the loss of result per m2 data on the maximum harvest outcome and the harvest outcome in the field per m2. The highest proportion value of the outcome loss per m2 based on the Walker Model, which has been modified on biological control with Nematode Entomo Patogen (NEP) Steinernema spp. combined with light trap, was in Tempel Sari, i.e. larvae instar 1 (0.0108), instar 2 (0.0174), and instar 3 (0.0221). The lowest value was in Grenjeng, i.e. larvae instar 1 (0.0048), instar 2 (0.0078), and instar 3 (0.0099). There were significant differences among the three instars, where the consumption greediness of instar 3 is higher than instar 1 and 2, so the proportion value of the outcome loss per m2 of larvae instar 3 in the respective locations was higher than that of the two other instars. Determination of EIL value based on the Bode & Calvin Models gave the highest EIL value in Grenjengwith larvae instar 1 in the amount of 15.50 with ET value 12.40, instar 2 in the amount of 9.59 with ET value 7.67, and instar 3 in the amount of 7.54 with ET value 6.03. On the other hand, the lowest EIL value was found in Tempel Sari, with larvae instar 1 in the amount of 6.97 with ET value 5.58, instar 2 in the amount of 4.31 with ET value 3.45, and instar 3 in the amount of 3.39 with ET value 2.71. 

Economic Injury Level (EIL) and Economic Threshold (ET) Concepts in Pest Management

2008 ◽  
pp. 1282-1286
Author(s):  
James C. Dunford ◽  
Louis A. Somma ◽  
David Serrano ◽  
C. Roxanne Rutledge ◽  
John L. Capinera ◽  
...  
Keyword(s):  
Pest Management ◽  
Economic Injury Level ◽  
Economic Threshold ◽  
Economic Injury

Alfalfa Stand Tolerance to Potato Leafhopper and Its Effect on the Economic Injury Level

2000 ◽  
Vol 92 (4) ◽  
pp. 726-732 ◽  
Author(s):  
Stephen A. Lefko ◽  
Larry P. Pedigo ◽  
Marlin E. Rice
Keyword(s):  
Potato Leafhopper ◽  
Economic Injury Level ◽  
Economic Injury
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