Stages of Diseases Development and TransmissionThere are four major stages of disease development and transmission in crops.
1. Invasion: This is the stage where 'the disease causing agent comes in contact with the host plant.
At this stage the disease causing agent enters and establishes llfe in the crop tissues.
This is the stage where the disease pathogen multiplies itself leading to the actual attack of the host.
This is the stage where the disease organism spreads from one plant to a healthy one. The process is aided by wind, water, insects contact and others.
7.5 Prevention and Control of Crop Diseases
It is better and more economical to prevent a disease from, crops than to control it when it has occurred. The sure way luting diseases, in farms is to prevent the disease causing organism from reaching the crops. This is possible through regular removal of rotten materials from the farm, routine spraying of crops planting resistant varieties and so on.
However, crop diseases can be controlled in the following ways:
1. Cultural Control
The techniques adopted in this control measure include:
(i) Proper care for plants such as regular weeding. This practice reduces the amount of disease attack on the crops.
(ii) Burning of farmland: This involves setting farmland on fire before cultivation. The fire helps to kill disease causing agent such as bacteria, fungi, virus and other organisms in the soil.
(iii) Karly Planting: Early planting enables the crops to escape the outbreak of some crop diseases.
(iv) Practicing Crop Rotation: This practice, ensures that crop which suffer from similar diseases do not follow each other in the same rotation. This is to make sure that the cycle of the disease development is disturbed.
(v) Removal of dead plants and other disease harbouring agents from the farm. The source of the disease is removed when this is done.
2. Biological Control
This involves the use of good ar.cl resistant crops varieties to plant. It is a very successful method of controlling most serious plant diseases. Over the years, scientists have developed crop types which have great resistance to some deadly crop diseases. The use of which helps to control most diseases of crops.
3. Chemical Control
This involves the use of chemicals to kill the disease organism affecting the crops. For example: (i) Fungicides such as perenox. Bordeaux mixture, and copper sulphate are used in the
control of fungus diseases.
(ii) Virus diseases can be controlled by using appropriate chemicals such as vetox 85 to kill the vectors e.g. aphids. mealy-bugs white flies, etc. that transmit the virus diseases.
(iii) Most bacterial diseases can now be treated using appropriatle chemicals (bacteriacides) such as Agrosan 5W mercurial duss and acid.
(iv) Nematodes can be controlled by using nematicides such a nemagoiu and DDT.
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HERE YOU WILL FIND EVERY AVAILABLE TOPICS ABOUT AGRICULTURAL SCIENCE AND BIOLOGY. AND THE LINKS TO THEIR VARIOUS SOURCES.
1. DEVELOPMENT OF AGRICULTURE
2. IMPORTANCE OF AGRICULTURE
3. SUBSISTENCE AGRICULTURE
4. COMMERCIAL AGRICULTURE
5. PROBLEM OF AGRICULTURAL DEVELOPMENT
6. SOLUTIONS TO POOR AGRICULTURAL DEVELOPMENT
7. AGRICULTURAL LAWS AND REFORMS
8. ROLES OF GOVERNMENT IN AGRICULTURAL DEVELOPMENT
9. AGRICULTURAL POLICIES
10. PROGRAM PLANNING IN AGRICULTURE
35. WILDLIFE CONSERVATION
36. FACTORS AFFECTING LAND AVAILABILITY
39. BIOLOGICAL FACTORS
40. SOCIAL-ECONOMIC FACTORS
41. ENVIRONMENTAL FACTORS AFFECTING AGRICULTURAL PRODUCTION
42. CLIMATIC FACTORS AFFECTING AGRICULTURAL PRODUCTION
47. SOLAR RADIATION
48. BIOTIC FACTOR AND AGRICULTURAL PRODUCTION
88. PH SOIL TEST
89. PLANT NUTRIENTS
90. MACRO NUTRIENTS IN GENERAL
112. THE MAINTENANCE OF SOIL FERTILITY
113. CROP ROTATION
114. APPLICATION OF ORGANIC MANURES
115. FARM YARD MANURE
116. APPLICATION OF INORGANIC MANURE
118. FARMING PRACTICES
119. BUSH BURNING
121. FERTILIZER APPLICATION
122. ORGANIC MANURING
123. FARM YARD MANURE
126. CROP ROTATION
133. FARM POWER AND MACHINERY
134. SOURCES OF FARM POWER
135. HUMAN SOURCE
142. FIELD MACHINES
164. SIMPLE FARM TOOLS
165. AGRICULTURAL MECHANIZATION
166. THE CONCEPT OF MECHANIZATION
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