scholarly journals Markovian Decision Problems Applied In Pest Control of Agriculture Production Systems

2013 ◽  
Vol 46 (24) ◽  
pp. 159-164
Author(s):  
W.P. Marcos ◽  
M.V.M. Ferreira ◽  
A.P. Cortes ◽  
J.J.P.Z.S. Tavares
Keyword(s):  
Pest Control ◽  
Production Systems ◽  
Decision Problems ◽  
Markovian Decision Problems

scholarly journals Special Issue: Integrated Pest Management in Arable and Open Field Horticultural Crops

Insects ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 82
Author(s):  
Andrew G. S. Cuthbertson
Keyword(s):  
Integrated Pest Management ◽  
Pest Management ◽  
Open Field ◽  
Pest Control ◽  
Production Systems ◽  
Special Issue ◽  
Horticultural Crops ◽  
The Past ◽  
Chemical Products ◽  
Invertebrate Pests

Invertebrate pest control within both agricultural and horticultural production systems continues to present many challenges. Over the past decades the commonly used method for pest control has been the direct application of chemical products. However, in response to environmental, economic, and other problems associated with the over-reliance on chemical insecticides there has been an increasing drive towards the development of Integrated Pest Management (IPM) approaches. Many IPM strategies are now well developed under protected environments. However, within the open field in many situations targeted success is yet to be achieved. This special issue will seek to showcase original articles and reviews by leading research entomologists and associated experts. Articles presented will focus on the development and implementation of IPM strategies against various major arable and horticultural invertebrate pests (both indigenous and invasive species).

Bounds and good policies in stationary finite–stage Markovian decision problems

1980 ◽  
Vol 12 (1) ◽  
pp. 154-173 ◽  
Author(s):  
Gerhard Hübner
Keyword(s):  
Decision Model ◽  
Transition Probabilities ◽  
Planning Horizon ◽  
Decision Problems ◽  
Optimal Decisions ◽  
Optimal Value ◽  
Action Spaces ◽  
Stationary Problems ◽  
Markovian Decision Problems

A stationary Markovian decision model is considered with general state and action spaces where the transition probabilities are weakened to be bounded transition measures (this is useful for many applications). New and improved bounds are given for the optimal value of stationary problems with a large planning horizon if either only a few steps of iteration are carried out or, in addition, a solution of the infinite-stage problem is known. Similar estimates are obtained for the quality of policies which are composed of nearly optimal decisions from the first few steps or from the infinite-stage solution.

scholarly journals Evaluation of the Initial Season for Implementation of Four Tomato Production Systems

1995 ◽  
Vol 120 (2) ◽  
pp. 148-156 ◽  
Author(s):  
Kenneth L. Steffen ◽  
Michael S. Dann ◽  
Jayson K. Harper ◽  
Shelby J. Fleischer ◽  
Sizwe S. Mkhize ◽  
...  
Keyword(s):  
Pest Control ◽  
Production Systems ◽  
Alternaria Solani ◽  
Cost Ratio ◽  
Trickle Irrigation ◽  
High Input ◽  
Mushroom Compost ◽  
Tomato Production ◽  
Benefit Cost Ratio ◽  
Fruit Cracking

During the initial season of implementation, four tomato production systems differing in soil management, pest control practices, and level of inputs, such as labor, materials, and management intensity were evaluated. These systems were CON, a low input (no mulch, no trellising, overhead irrigation, preplant fertilization, scheduled pest control), conventional agrichemical system; BLD, a high input [straw mulch, trellising, trickle irrigation, compost fertility amendment, integrated pest management (IPM)], ecologically-oriented system that emphasized the building up of soil organic matter levels and used no agrichemicals to supply fertility or for pest control; BLD+, a system similar to BLD, except that agrichemical pesticides were used; and ICM, a high input system (black polyethylene mulch, trellising, trickle irrigation, fertigation, IPM pest control) that used agrichemicals to supply fertility and for pest control. Soil characteristics and fertility levels in the BLD and BLD+ systems were modified with extensive amendments of spent mushroom compost and well-rotted cattle manure. Levels of agrichemical NPK calculated to meet current crop needs were supplied to the CON and ICM systems, with 75% of fertility in the ICM system supplied through the trickle irrigation lines (fertigation). The BLD system had a greater soil water holding capacity and sharply reduced irrigation requirements. During a wet period, fruit cracking and evidence of water-mold root rot were significantly higher in the ICM system than the BLD and CON systems. Defoliation by Alternaria solani was greatest in the BLD system and least in the ICM system. The BLD and ICM systems resulted in a 1 week earlier peak yield compared to the CON system. The yield of No. 1 fruit was 55% to 60% greater in the BLD+ system than the other three systems, which were comparable in yield. Net return was highest in the BLD+ system, although the benefit/cost ratio was greatest in the CON system. This multidisciplinary study has identified important differences in the performance of diverse production systems during the unique transitional season.

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