Integrated pests management refers to a wide range of
tactics to prevent pests of all kinds from reaching damaging levels in plants. Pests
can be insects, mites, diseases, weed or vertebrates such as birds.
Integrated management involves use of a combination of the following
methods/tools.
Biological control
- Predators
for integrated management: e.g. use of ladybird to control of predatory
mites, mites, whiteflies, aphids etc.
- Parasites
:parasitoid such as parasitic wasp
- Pathogens:
e.g. use of fungus Bauveria bassiana to control banana and sweet potato
weevil, a bacteria Bassillus thuringiensis is used in control of
lapidopteran larvae
- Biological
agents can be commercially prepared such as swirski mite, spical, spidex,
ercal etc.
Cultural Control
This involves use of agronomic practices that are designed
to optimize crop growing conditions and increase the competitive edge. This
results in increased tolerance and reduced chemical use. The cultural methods
include:-
·
Crop rotation: this works by reducing the levels
of pests attack due to rotation with non susceptible host.
·
Selecting resistant plant varieties: This helps
to reduce severity of the attack in integrated management.
·
Cultivation/tillage practices
·
Variation of planting or harvesting dates: e.g.
delayed planting in sunflower to reduce the sunflower beetle densities as
integrated management measures.
·
Plant spacing: narrower row spacing favours
development of diseases, due to environmental conditions within the canopy.
·
Fertilization level: a crop with a balanced
fertility levels has a greater capacity to compete with weeds
·
Sanitation: Cleaning out storage areas helps
prevent infestation of stored grain. Use of clean farm equipments and clean soil
helps prevents spread of nematodes
·
Planting pests’ free seed or using seed treatment
with a fungicide will help protect germinating seed and seedlings from seedling
blight.
·
Planting trap crops: This consists of a
surrounding field margin. The margins flower earlier and attract the insects
concentrating them in a small area which reduces the cost of insecticide and
the time required.
Plant resistance control
Classical selective breeding or genetic modification is used
for integrated manament leading to a plant that is resistant, no longer
preferred by the pests or creates an adverse effect.
Chemical control
This involves use of chemicals for integrated control.
However they should only be used as a last result and when preventative and all
other management techniques have failed, or are no longer economical. They also
should be used in a manner that is legal considering rate of application,
target crop etc.
Physical or
mechanical control
This involves use of machinery or other tools for integrated
management e.g.
- Tillage-Row
cultivation can be used as a stand alone weed management practice or in
conjunction with herbicide program.
- Physical
barriers e.g. mulching.
- Exclusion
using screens or barriers, preventing the pests from reaching and
destroying crops/grains.
- Trapping,
suction devices such as pherohormone traps, can be used in integrated
management to catch insects, sticky traps and light traps.
- Use of heat in soil sterilization for control of nematodes and other plant pests
