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Crop Protection

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Submitted By CyperusRotundus
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CPROT 106.6

CULTURAL CONTROL
Is the practice Of modifying The growing environment of the crop or habitat of the unwanted pests to reduce their prevalence. It is also defined as the deliberate alteration of the production system, either the cropping system itself or a specific crop production practices to reduce pest populations Or avoid pest injury to crops.

>It differs from physicomech'lcontrol
Because the effect of these tactics are mediated through the crop or the crop environment rather than having an impact on the pestItself

Drawbacks
Being indirect, makes it slow acting has limitation where immediate action is needed as the lone method, cultural method may not eradicate pests; implementation must be in tandem with another or as part of the whole management program.

Cultural Control _ Mechanics
1. Impediment to pest colonization of the crop
2. Creation of adverse biotic conditions that reduce survival of individuals or populations of the pest
3. Modification of the crop in such a way that pest infestation results in reduced injury to the crop
4. Enhancement of natural enemies by manipulating the environment

CROP ROTATION
Effective when used against
Pests that attack biennial or annual crops
Pests that have relatively narrow host range
Pests that have restricted movement
Pests that are present prior to planting

CULTIVATION MODES cause Mechanical injury, starvation, dessication and exposure

TRAP CROPS VSANTAGONISTIC PLANTS
USE OF HEALTHY
PLANTING MATERIALS
HABITAT DIVERSIFICATION
SELECTION OF PLANTING SITE
MANIPULATION OF PLANTING AND OR HARVEST DATE
CROP NUTRITION MANAGEMENT
PROPER PLANT SPACING, RATE OF SOWING, AND PLANT DENSITY
SANITATION & CLEAN CULTURE
CONTROLLING ALTERNATE HOSTS
Moisture Management
>Fallowing or Host-Free Periods
>Soil amendments and mulches
>Hedgerow, Field Margins and Plant Refuge
>Protected Cropping

CPROT 1067

PHYSICAL & MECHANICAL CONTROL

Premise • Actions are taken specifically for pest control purposes and not merely modification of existing management or cultural practices • Preventive or Corrective

Exploits... • Weak-links in pest life cycle or specific pest behavioral patterns

Heat & Steam Sterilization
Heat or steam sterilization of soil is commonly used in greenhouses for control of soil-borne pests

Fire & Flaming
The torch flame heats to about 2,000 degrees Fahrenheit and only requires split seconds to kill the weed. It kills the weed not by burning but by boiling the water in the stems and foliage. Young annual weeds are the easiest to kill. Perennial weeds may require repeated flaming. Work rapidly so you don't disturb the soil and kill soil microorganisms.

Solarization
“it heats the soil. Within two minutes, it will take 60-degree soil and heat it to 200 degrees. It is like a microwave.”
Cold Storage
Radiation
Light Traps
Pest Barriers
Adhesive Substances

CPROT 106.8A

CHEMICAL CONTROL * Pesticides * Insecticides * IGRs * Herbicides * Fungicides * Rodenticides * Molluscicides * Semiochemicals

EFFICACY AT A PARTICULAR STAGE 1. Ovicides 2. Larvicides

ORIGIN OF ACTIVE INGREDIENTS 1. Inorganic insecticides include the class of compounds which had been important before like calcium arsenate, lead arsenate, cryolite and elemental sulfur 2. Organic insecticides include botanicals and their derivatives and synthetic organic insecticides like botanical insecticides e.g. Nicotine, Pyrethrum, Rotenone

PYRETHRUM

* Pyrethroid is a fast acting contact poison derived from the pyrethrum daisy or chrysanthemum. * It is a natural product that comes from the ground-up dried flower head of the African chrysanthemum, Chrysanthemum cinerariaefolium. * Pyrethrins refer to the insecticidal compounds that occur in pyrethrum, and very toxic to cold blooded animals. * Pyrethrin is effective on most insects, but does not control mites. It rapidly breaks down in sunlight, air, and water. It is usually used against pickleworms, aphids, leafhoppers, spidermites, harlequin bugs, and cabbage worms.

NICOTINE * nicotine concentrate is very poisonous if inhaled, it is derived from tobacco and is commonly sold as a 40% nicotine sulfate concentrate. * It is a fast acting contact killer for soft-bodied insects but does not kill most chewing insects * Established since the mid 18th century

ROTENONE * It is derived from the roots of over 68 plant species, specifically Derris spp., and is very toxic to fish, pigs, and cold-blooded animals * It was originally employed to poison fish by the Native Americans and other cultures to poison fish. * It has a short residual toxicity * It is a broad spectrum poison mainly used to control leaf-eating caterpillars and beetles, spittlebugs, aphids, potato beetles, harlequin bugs, chinch bugs, spider mites and carpenter ants * Direct contact may cause skin and mucus membrane irritation, and more toxic when inhaled
RYANIA
* Is a slow acting stomach poison * It has longer residual toxicity than most botanicals. * Toxicity to mammals is moderate, but normally used against codling moths, Japanese beetles, squash bugs, potato aphids, onion thrips, corn earworms and silkworms

SABADILLA * Is derived from the seeds of South American lilies * Toxic components are lacking in other plant parts * It is a broad spectrum contact poison, but has some stomach poison action * It is very toxic to honeybees, but usually used against grasshoppers, codling moths, moths, armyworms, aphids, cabbage loopers, blister beetles, squash bugs and harlequin bugs * It is the least toxic botanical to humans

NEEM * Azadirachtaindica extracts can control about 200 insects, including mites and nematodes

SYNTHETIC ORGANIC INSECTICIDES

ORGANIC THIOCYANATES -contact poisons acting on the nervous system of insects (K Thiocyanate)

DINITROPHENOLS * Effective by contact or ingestion against insects and mites at all stages * e.g. 2, 4-dinitrophenols *
SULFONATES, SULFIDES, SULFONES, SULFITES * Used as contact acaricides * e.g. ZP Copper Sulfates

ORGANOCHLORINES * Contain carbon, chlorine, hydrogen and sometimes oxygen * These compounds disrupt Na and K balance in the nerve cells affecting the nervous system by acting on the transmission of nerve impulses in insects and mammals * e.g. THIODAN (brandname), endosulfan (a.i.)
ORGANOPHOSPHORUS
* Or organophosphates are the largest and the most versatile group of insecticides and acaricides, a few are herbicides and nematicides * These are more toxic than organochlorines, broad spectrum but non-persistent or less persistent thanorganichlorines * Effective as contact poisons, stomach poisons and fumigants * These compounds disrupt Na and K balance in the nerve cells affecting the nervous system by acting on the transmission of nerve impulses in insects and mammals * e.g. BASUDIN (brand name), diazinon (a.i.)

BASED ON MODE OF ENTRY, INSECTICIDES CAN BE… A. Contact poisons - enter through integument and kill insects upon contact B. Stomach poisons - enter through the mouth and exhibit action after taken in/ingested by insect C. Fumigants - enter into the insect's body in gaseous state via the respiratory organ

BASED ON KINDS OF INSECTS KILLED, INSECTICIDES CAN BE... A. Broad spectrum B. Narrow spectrum

BASED ON THE MODE OF ACTION, INSECTICIDES CAN BE... A. Physical poison affecting insect parts like cuticle. When cuticular wax is damaged, it causes rapid dessication of insects. some block spiracles preventing normal gas exchange. B. Metabolic inhibitors affect certain insect metabolism like respiratory poisons (cyanides, rotenone, and carbon monoxide {CO}), inhibitors of the mixed function oxidase {MFO} such as pyrethrum. C. Neuroactive poisons include the cholinesterase (CHE) inhibitors such as organophosphates and carbamates, and the effectors of ion permeability such as DDT and benzene hexachloride (BHC)

BASED ON FORMULATION, INSECTICIDES CAN BE .. A. EC or emulsifiable concentrate B. WP or wettable powder C. SG or soluble granules D. F or flowables E. ULV or ultra low volume concentrate is in its original liquid form or its solid form dissolved in a minimum of solvent

HERBICIDES

Categories/ Classification * Timing of Application * Physiological Impact or Selectivity * Mode of Action * Mobility in Plant * Herbicide Groupings * Site of Application * Toxicity (LD50)

Timing of Application * Preplant * Preemergence * Post-emergence

PHYSIOLOGICAL IMPACT OR SELECTIVITY ^ Selective v Broad Spectrum

MODE OF ACTION – plant metabolism based
>Photosynthetic inhibitor
>Mitotic/ protein synthesis inhibitor
>Growth regulators

MOBILITY IN PLANT * Contact * Systemic
FUNGICIDES
RODENTICIDES

LISTAHAN NG KEMIKAL NA PAMATAY-DAGA
Di-organik (e.g. P & Zn3P2)
Organik
2.1 Botanikal (Red Squill, Scilliroside, Strychnine)
2.2 Sintetik 2.2.1 Mga kroniktoksikant (Diphacinone) 2.2.2 Mgaakyuttoksikant
Fluorine cpds.
Calciferol
Zn Phosphide 2.2.3 Mgapumigant
Hydrogen cyanide, carbon disulfide, 3.2.4 Mgapambugaw (Alpha-chlorohydrin)
Paraanngpaggamitngpamatay-daga
1. Paingbutil (cereal bait) 2. Paingtubig (water bait) 3. Peletong pain (pelleted bait) 4. Blokeng pain (bait block) 5. Polbospanlandas (tracking

MOLLUSCICIDES

METHYLDEHYDE
Draws fluid from the body of a snail by contact action and thus disturbs its fluid balance by dehydration.The animal protects itself against such by secreting slime (recovery is possible)
METHIOCARB
Effect or control results primarily from poisoningAn added advantage is that it retains its effectiveness at lower temperatures better than metaldehydeIn the granular formulation, the ai has been mixed with baiting material; bait action is limited E.G. OF MOLLUSCICIDES
Metaldehyde – Slugan, Sluggex, Snail Away, Antimilace, Medadol.
Methiocarb – Mesurol
Fentin Acetate – Brestan, Hoe 2824, Suzu
Fentin Chloride – Hoe 2872, Tinmate
Fentin Hydroxide – Aquatin, Du-Ter, Suzu H
Niclosamide – Telustan, Bayluside

SEMIOCHEMICALS * Attractants * Sex pheromones

CPROT 106.9

BIOLOGICAL CONTROL

KINDS OF NATURAL ENEMIES
• Parasite
• Parasitoid
• Pathogens
• Predator. Feed on prey in their larval stages, consuming a number of individual preys in order to complete development

Parasites, in general, live on the body of the animal they feedupon. In fact, their hosts are generally animals with permanent dens, nests, or homes where the parasite may deposit its eggs. But, these animals do not kill their hosts because survival of the host benefits parasite populations.
Parasitoids enter their host, feed upon it, and usually kill it. Parasitoid insects include wasps, a few flies,beetles, and the twisted wing insects. Typically, the female wasp deposits her eggs near, on, or in the larva of another insect or arthropod. The wasp larva feeds on it, eventually killing it. Usually the larva emerges before the insect dies or pupates. Some wasps insert their own eggs into the eggs or pupae of other insects.
Pathogens are agents that cause disease in organisms.
Examples include fungi, bacteria, viruses and sometimes nematodes. HERBIVORES, COMPETITION AND MICROBIAL ANTIBIOSIS

Herbivores
• An organism that gets its energy from eating plants, and only plants.

Competition
• Is an interaction between species, in which the fitness of one is lowered by the presence of another.

MICROBIAL ANTIBIOSIS
• Or ANTAGONISM
• Is a phenomenon where one microbe inhibits another microbe.
• And at the same time that othermicrobe is not afected.
• Usually inhibitory compounds, produced by one microbe cankill one or more microbe.

WAYS TO APPLY BIOLOGICAL CONTROL

• CONSERVATION. Conservation biological control (CBC) is the practice of enhancing natural enemy efficacy through modification of the environment or of existing pesticide practices (Eilenberg et al., 2001).

• IMPORTATION. Importation biological control means to introduce a new natural enemy from one locale to a new setting, hence "importing" it. This approach is often called "classical" biological control; some biological control practitioners consider this the only "true" biological control approach

• AUGMENTATION or Augmentative biological control. The release of additional numbers of a natural enemy when too few are present to control a pest effectively. This relies on an ability to mass-produce large numbers of the natural enemy in a laboratory

CBC BY JONSSON ET AL. (2008)
• (1) honeydew as a food source for natural enemies,
• (2) artificial food sprays,
• (3) shelter habitats,
• (4) chemical ecology and CBC,
• (5) natural enemy diversity and CBC,
• (6) CBC at a landscape scale,
• (7) CBC as provider of multiple ecosystem services, and
• (8) economics and adoption of CBC.

SUCCESSFUL BIOLOGICAL CONTROL PROGRAMS
Rodoliacardinalis .Iceryapurchasi
Trichogramma
Order Hymenoptera
Family Trichogrammatidae

PMS = PEST MANAGEMENT STRATEGIES
>Regulatory
>Cutural
>Biological
>Physical

CPROT 106.12

IPM CONCEPT
Outline
1. Developments of IPM
2. IPM Definitions
3. Goals & Scope of IPM
4. Management Strategies vs Management
Tactics
5. What does IPM integrate?
6. Management Rules
7. Features of IPM

IPM Definition
• IPM is a systems-approach to reduce pest damage to tolerable levels through a variety of techniques including natural predators and parasites, genetically resistant hosts, environmental modifications, and when necessary and appropriate _ chemical pesticides ETL-Based IPM
• ETL (Economic Threshold Level) is that level of a pest population which indicate that control tactics should be used to stop pest numbers from increasing further, thereby prevent economic losses to the host crop.
• ETL for informed decisions
Pre IPM Era
• Integrated Control was the first term coined to address this concept; it was created by a group of entomologists in the late 1950’s at the University of California at Riverside led by
V. Stern. Integrated Control emphasized the selective use of chemicals so that natural enemies were conserved in the ecosystem.

Emergence of the Early Concepts of IPM
• The term Pest Management came about in the early 1960’s, which then evolved into
Integrated Pest Management (IPM)

POTs
• IPM packages designed for each commodity

The NEW IPM Concept
• Agroecosystem approach
• Agroecology-based
• Ecological Control or Biointensive Farming

GOALS & SCOPE OF IPM BY ALSTON, 1996
1. Optimize profits over the long term
2. Sustain resource both agricultural or natural in the long run
3. Practice more rational or judicious use of pesticides
4. Reduce environmental contamination and its costs in soil, ground water, surface water, pollinators, wildlife, endangered species
5. Utilize natural control by conservation and augmentation
6. Minimize pesticide resistance problems
7. Minimize pest resurgence and secondary pest outbreaks
8. Ensure food safety
9. Ensure worker/farmer safety.

MANAGEMENT STRATEGIES & TACTICS
• Strategy is an over-all plan to reduce a pest problem while, a
• Tactic is an actual method used to implement the strategy

STRATEGIES
1. Do nothing
2. Reduce numbers
3. Reduce crop/host/ecosystem susceptibility
4. Combined strategies

TOP ... TACTICS
1. Pest resistant cultivars
2. Cultural & physical controls
3. Biological controls
4. Chemical controls (applied- or usedjudiciously)

What does IPM integrate?
• Integrates multiple pest management tactics
(chemical, biological, cultural, mechanical).
• Integrates management of multiple pests (insects, weeds, disease pathogens, nematodes, vertebrates, etc.).
• Integrates pest management tactics on an areawide basis (many pest control situations are better handled on a large-scale or regional basis).

MANAGEMENT RULES
1. Grow a healthy crop
2. Observe fields weekly
3. Manage the agroecosystem
4. Farmer empowerment
5-FEATURES OF IPM
1. Avoid the use of disruptive pesticides
2. Build beneficial refuges
3. Monitor insect ecology
4. Develop cultural practices
5. Release beneficial organisms, or conserve what is already present in the field.

CPROT106.13

ECOLOGICAL & SOCIOLOGICAL CONCEPTS OF IPM
OUTLINE

1. Towards an ecologically-based IPM
– Agroecosystem
– Agroecology
– Key Processes or Nested Cycles
a. Energy is stored as OM in the soil and brought into the system by m’o and detritivorous insects
b. Aquatic plankton provides food for filter-feeding insects as midges and mosquitoes
c. Larvae & adult plankton feeders and detritus feeders provide a consistent & abundant source of alternative food for generalist predators from early in the season until harvest

2. Sociological Concepts of IPM
– Ethnoscience
– Decision-making
– Disseminating science into practice
– Participatory Action Researches (PAR)
– Strategic Extension Campaign (SEC)
– Farmers’ Field School (FFS)

TOWARDS AN ECOLOGICALLY-BASED IPM
• The agroecosystem is a unit composed of the total complex of myriads of organisms in the crop area together with all the interacting factors in the environment
• Demand for higher productivity paved the way for excessive use of pesticides bringing about negative impacts to the environment
• Indiscriminate use of pesticides without regard to the complexities of life existing in the agroecosystem led to disruption of the so called ecological balance
• Detrimental side effects included that of ...
1. Pesticide resistance by pests
2. Pest resurgence
3. Secondary pest outbreaks
4. Pesticide residue problem
5. Environmental pollution
6. Health hazards

COMPOSITION OF THE NATURAL ECOSYSTEM
• Producer
• Agroecosystem
• Pests
• Predators and Parasites
• Scavengers
• Neutrals
• Weeds
• Microorganisms
• The interplay of all... The more complex...the more stable is the agroecosystem.

AGROECOSYSTEMS
By nature are artificial ecosystems created by humans. But being such doesnot excuse us to ignore the ecological processes. A good example of our disregard of the ecological principles is the PESTICIDE TREADMILL.

THE PESTICIDE TREADMILL
In turn, we focused more on the pest...

Which was not enough... We realized that we have to look at the totality! Not just pests, but the crops, predators and parasites... And focus on crop management Then the research on applied ecology pushed into gear

Dynamics of the entire ecosystem of rice are then outlined as follows

KEY PROCESS 1
Energy is stored as OM in the soil and brought into the system by microorganisms and detritivorous insects.
KEY PROCESS 2
Aquatic plankton provides food for filter-feeding insects as midges and mosquitoes.
KEY PROCESS 3
Larvae and adult plankton feeders and detritus feeders provide a consistent and abundant source of alternative food for generalist predators from early in the season until harvest.

IPM Approach is now ecologically based starting in the 1990s
• Pesticide became a last resort instead of the instant remedy • Pesticide-free harvests and organically grown produce is the "IN" thing

SOCIOLOGICAL CONCEPTS OF IPM

Ethnoscience or COGNITIVE ANTHROPOLOGY is the study of people's perceptions of their surroundings as reflected in their use of language

In IPM,
E.G. OF MOLLUSCICIDES
A. the farmer's perception of certain phenomena can significantlyaffect their decision on whether or not to adopt the technology
B. Decision-making, on the other hand, is defined as the intentional and reflective choice in response to perceivedneeds.
C. As such, understanding how farmers perceive IPM is the first step to improve acceptability of IPM
D. Understanding the farmers' beliefs, knowledge, attitudes, and reasoning or cognition can uncover clues to help them makebetter decisions.
Information IntegrationTheory
• Despite IRRI's attempt to provide answers to field problems in their researches,..., admittedly, crop management was slow in picking up, q.v.
• vegetable farmers in Leyte spray Lannate to controldowney mildew disease of ampalaya, also practice application of Ammonium sulfate
(as N source) to fertilize ginger, while some consider that ants lowers jackfruit yield

Participatory Action Researches (PAR)
Strategic Extension Campaign (SEC)
Farmer Field School (FFS)

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Farming

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Chicory

...principles, contribution to farming and the associated limitations- an analysis Summary Chicory (Cichorium intybus) is an increasingly popular crop that is excellent in providing high quality feed and high mineral content to grazing animals. Chicory is fast to establish and competitive for its resources given the right conditions, thus has high yields that occur in autumn, spring and summer. Yields expected, range from 8- 10t/ ha which consist of green leaf tissue which is valuable to New Zealand farms. The aim of the report is to find out the potential contribution of chicory to New Zealand farms by its agronomic principles, main advantages and the associated limitations. The literature covered in the findings is from Australian and New Zealand journals and websites, majority being by New Zealand researchers. Findings suggest that chicory is beneficial to New Zealand system under the right conditions following certain guidelines and recommendations. Deer and lambs can do better on chicory rather than the traditional ryegrass (table 1). Other findings suggest that climate change will have an impact on plant growth in chicory. Introduction Chicory is classed as a forage crop that belongs to the Asteracea family. It is commonly used as a specialist summer feed crop which is vital during summer and spring. Unique advantages of the crop ranges from maintaining and increasing the feed supply and quality whilst also providing a source of minerals to the grazing animal. Agronomic...

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Strategies to Overcome Malnutrition

...across gullies. Those methods only use 5% of farmland but increase the crop yields over 50%. Fertilizer from local animals should be used instead of chemical fertilizer. Since fertilizer from animal is always available and free. Chemical fertilizer can cause disease. Simple, reliable, agricultural tools made should be used instead of tractors. Because tractors can be broken and farmers need money to repair them. Farmer can grow cash crops and subsistence crop together in smallholdings instead of cash crops (monoculture) on large estates. Farming mixes with crop rotation or intercropping will reduce soil erosion and exhaustion, protect crops (smaller plants protected by tree crops) and increase yields. For example, in Moc Chau district in Viet Nam, by using this method, crops yield is increased by 33% from 1994-2000. 2) Introduce a new “Green Revolution”: In Mexico, 2 decades after World War II, new varieties of wheat and maize were developed. They produced dwarf plants capable of withstanding strong winds, heavy rain and diseases. Yields of wheat and maize tripled and doubled. The IR-8 variety in Philippines has increased the crop yield by six times at its first harvest. The “super rice” has increased the yield by 25% (1994). Since then, more and more improvements have been made such as: the growing season is shortened, crops can...

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References

...The study was undertaken with the focus on Minimum Support Price and its impact on various parameters of agricultural economy including growth parameters, distribution aspects, and decision making in allocation of resources, environmental effects and above all MSP as an effective instrument of the price policy. The study was mainly dependent upon the data collected from secondary sources at the state level and supported with the primary data. The price policy was more effective in case of paddy and wheat as compared to cotton in the Punjab State. Since 1990s, the gap between farm harvest price and MSP in case of paddy narrowed down considerably while for wheat, the farm harvest price was even lower than the MSP for some years. It was due to the reluctance shown by the Government to purchase large volumes of paddy and wheat arriving in different markets of the state due to lower storage capacity and already piled large stocks of food grains. The growth in MSP, wholesale price and farm harvest price for paddy, wheat and cotton was higher in period II (1985-86 to 1999-2000) as compared to period I (1970-71 to 1984-85). The farmers’ response regarding the awareness of MSP was the highest for wheat followed by paddy and cotton. The increase in MSP had induced the use of new technology and increase in output. Also, the impact of MSP in increasing the adoption of technology was found to be negatively associated with farm size. There was no regional disparity observed in procurement of...

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Agronomy Thinker Session

...shared by the speakers? (2-3 sentences) The main message of the speakers was pretty much their own experiences, and how their farms operate. It was really interesting to see the different types of farming. All three of them were completely different than what we do on my home farm. They shared pros and cons of how they farm, and what they’re doing in the future to make the way they farm better. What were the main concerns/observations/experiences of the speakers that formed the basis for their comments and/or recommendations? (about ½ page) Nathan talked about his 850 acre row crop operation. On his family farm, they also raise about 80 stock cattle on 50 acres of pasture. Something that they are experimenting with is planting cover crops on their row crops, and then grazing the cattle on the cover crops. This has worked so far, and they are looking to do more of this. Nathan thinks that grazing cover crops is a logical step for the best management of the farm. Doing this, Nathan believes it will be helpful for long term farming. Something that Nathan doesn’t like doing is spraying, therefore making it unsustainable. He is trying to figure out ways to reduce the amount of spraying and fertilizer that they use on his family farm. Mike operates an 858 acre bison farm. Mikes family started with beef cattle, and tried to manage them like bison, grazing them year around. This didn’t work, and they lost quite a few calves. Mike had an “Epiphany” and asked his parents if they could sell...

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Marketing Boards in Kenya

...Marketing is the process of creating consumer value in the form of goods, services, or ideas that can improve the consumer’s life. Marketing board is an organization created by many producers to try to market their product and increase consumption and thus prices. It can also be defined as an organization set up by a government to regulate the buying and selling of a certain commodity within a specified area. They most commonly exist to help sell farm products such as milk, eggs, beef or maize and are funded by the farmers or processors of those crops or products. Marketing boards often also receive funding from governments as an agricultural subsidy. The leadership and strategies of the marketing boards are set through votes by the farmers. Marketing boards also sometimes act as a pool, controlling the price of farm products by forming a legal cartel. They also fund other ventures beneficial to their members such as research. Marketing boards are state-controlled or state-sanctioned entities legally granted control over the purchase or sale of agricultural commodities. Since the mid-1980s they have declined in number under pressure from domestic liberalization and from international trade rules that increasingly cover agriculture. Where reforms have been widespread and successful, marketing boards have vanished or retreated to providing public goods, such as strategic grain reserves or insurance against extraordinary price fluctuations i.e. the National cereals board, the...

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