i) Fungal diseases
Are responsible for causing most plant disease and the lead to physiochological disorders
E.g. smuts, blights, rust blasts, leaf spot, damping off.
ii) Viral disease
Are disease caused by virus whose general symptoms include chlorosis, stunted
Growth, mosaic, nechrosis, leaf curl e.g. maize streak, mosaic, greening, tristeza rosette, ratoon stunting.
iii) Bacterial disease
Are disease caused by bacteria are microscopic pathogens that are large than virus and cause damage the plant cells e.g. haloblight, bacterial wilt.
Kavungya answered the question on June 13, 2019 at 08:59
- State two factors considered before deciding on the use of chemical method of pest control in vegetable production.(Solved)
State two factors considered before deciding on the use of chemical method of pest control in vegetable production.
Date posted: June 13, 2019. Answers (1)
- What is a selective herbicide?(Solved)
What is a selective herbicide?
Date posted: June 13, 2019. Answers (1)
- State one economic importance of Mexican marigold.(Solved)
State one economic importance of Mexican marigold.
Date posted: June 13, 2019. Answers (1)
- State one disadvantage of Sow thistle to livestock.(Solved)
State one disadvantage of Sow thistle to livestock.
Date posted: June 13, 2019. Answers (1)
- Give any two economic importance of Nut grass (Cyperus rotundus).(Solved)
Give any two economic importance of Nut grass (Cyperus rotundus).
Date posted: June 13, 2019. Answers (1)
- Why is it difficult to eradicate Nut grass (Cyperus rotundus)?(Solved)
Why is it difficult to eradicate Nut grass (Cyperus rotundus)?
Date posted: June 13, 2019. Answers (1)
- Outline the economic importance of Lantana/thick berry(Solved)
Outline the economic importance of Lantana/thick berry.
Date posted: June 13, 2019. Answers (1)
- Reasons why clean weeding may be undesirable.(Solved)
Reasons why clean weeding may be undesirable.
Date posted: June 13, 2019. Answers (1)
- Name two classes of weeds on the basis of each of the following.
a) Growth cycle.
b) Morphology(Solved)
Name two classes of weeds on the basis of each of the following.
a) Growth cycle.
b) Morphology
Date posted: June 13, 2019. Answers (1)
- Explain five reasons for controlling weeds.(Solved)
Explain five reasons for controlling weeds.
Date posted: June 13, 2019. Answers (1)
- Give one reason in each case why its difficult to control the following weeds. (i) Oxalis (ii) Nut Grass (iii) Couch grass(Solved)
Give one reason in each case why its difficult to control the following weeds.
i) Oxalis
ii) Nut Grass
iii) Couch grass
Date posted: June 13, 2019. Answers (1)
- Name two classes of weeds based on morphology.(Solved)
Name two classes of weeds based on morphology.
Date posted: June 13, 2019. Answers (1)
- Give three ways by which weeds are adapted for successful propagation.(Solved)
Give three ways by which weeds are adapted for successful propagation.
Date posted: June 13, 2019. Answers (1)
- State two herbicides that can be used to control Black jack in a field of growing maize.(Solved)
State two herbicides that can be used to control Black jack in a field of growing maize.
Date posted: June 13, 2019. Answers (1)
- List six economic importance of weeds in mixed farming.(Solved)
List six economic importance of weeds in mixed farming.
Date posted: June 13, 2019. Answers (1)
- Define the term noxious weed.(Solved)
Define the term noxious weed.
Date posted: June 13, 2019. Answers (1)
- State four ways in which chemicals control weeds.(Solved)
State four ways in which chemicals control weeds.
Date posted: June 13, 2019. Answers (1)
- Outline four farm conditions that necessitate the use of herbicides over other methods in controlling weeds(Solved)
Outline four farm conditions that necessitate the use of herbicides over other methods in controlling weeds
Date posted: June 13, 2019. Answers (1)
- Describe any four types of land slides(Solved)
Describe any four types of land slides
Date posted: June 13, 2019. Answers (1)
- Outline four roles of trees in soil and water conservation.(Solved)
Outline four roles of trees in soil and water conservation.
Date posted: June 13, 2019. Answers (1)