1 A pest is a plant or animal detrimental to humans or human concerns (as agriculture or livestock production)
2. it includes organisms that cause nuisance and epidemic disease associated with high mortality
3. An animal or insect or other organisms that causes problems for people especially by damaging crops
4. To humans, it is anyone who others or annoys other people
5. in its broadcast sense, it is a competitor of humanity
Integrated Pest management in rice base cropping system
1. Integrated Pest Management in Rice
base cropping system
Olumoye. E. Oyetunji
Musa Room, IITA
Ibadan, Nigeria.
07 August, 2015
AGRA TRAINING PROGRAMME FOR TECHNICIAN
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2. • Background
• What is a pest?
• Rice ecologies with different constraints
• Pests in rice base cropping system
• Research highlights on major insect pests of rice
- African rice gall midge (AfRGM)
- Stem borers
- Termites
- Vectors of rice yellow mottle virus (RYMV)
Research products
Perspectives
OUTLINESOUTLINES
4. Descriptions
• A pest is a plant or animal detrimental to humans or human
concerns (as agriculture or livestock production)
• It includes organisms that cause nuisance and epidemic
disease associated with high mortality
• An animal or insect or other organisms that causes
problems for people especially by damaging crops
• To human, it is anyone who bothers or annoys other
people
• In its broadest sense, it is a competitor of humanity
5. Category of pest
• General categories:
• Pest can include:
Plants
Animals
Insects
Birds
Pathogens etc
For example:
•Insects are pests for
farmers
•Caterpillar are pest to
crops
•Flies are pest to animals
•Mice are household pests
etc
7. Agro-
ecologic
al zone
Main biotic
constraints
Guinea
savanna –
humid
forest zone
Weeds
Termites
Stem borers
Blast
Guinea savanna –
humid forest zone
Weeds
Blast
AfRGM
Stem borers
Sudan savanna -
humid forest
zone
Weeds
AfRGM
Stem Borers
RYMV
BLB and Blast
Sahel - humid
forest zone
Weeds
AfRGM
Stem Borers
RYMV
BLB
Biotic constraints across major rice
ecosystems
Upland Hydromorphic Lowland Irrigated
lowland
8. Different Pests of rice
• Pest in fields include the followings:
Birds
Weeds
Insects
Pathogens
9. BIRDS
• Bird has been a major
constraint in rice
production
• Damage by bird invasion
can reach up to 75% of
total output
• The cost of bird scaring
could reach up to 50% of
total production costs
Types
Village Weaver
Red-headed Quelea
Bronze Mannikin
Ploceus weavers
10. Bird control
• Erect scarecrows
randomly in the
• Scare the bird manually
• Tie old VHS tapes
diagonally
• Install bird nets if available
• Use catapults
scarecrow
11. WEEDS
• Weeds are defined simply as
plants out of place
• This include any plants that
interfere with the cultivation of
desirable plants causing economic
loss through increased production
costs, or that reduce the yield
and/or quality of the crop
• Weed compete with crop for
Space
Light
Nutrients
Water
Factors aiding weed competitiveness
depends on the following influences:
a) relative growth stages of rice
and weed,
b) nature of stand establishment
(transplanting and direct seeding)
c) density of planting
d) rice variety (short variety vs. tall, leafy
variety)
e) moisture and nutrient availability
Types
•Grasses
•Sedges
•Broad leaves
•Algae
12. Weed management
Weeds can be managed
through:
•1. Land Preparation
•2. Water Management
•3. Hand Weeding
•4. Hand Hoeing
•5. Brushing
Bunds/Peripheries
•6. Crop Rotation
• 7. Herbicides
CATEGORIES OF HERBICIDES
•Herbicides are divided into three groups,
depending or the time of application:
•a) Pre-planting (application before crop is
planted)
b) Pre-emergence (application after planting, but
prior to emergence of weeds)
c) Post-emergence (application after emergence
of weeds)
•mode of action:
•1) Contact herbicides - kill plant tissues at or very
close to point of contact.
2) Systemic herbicides - move wither the plant to
expert affects away from the point of contact.
3) Selective herbicides - kill or stunt come plant
species, with little or no effect on others
13. Weed management
• After the establishment of the field,
allow standing water to control weed
• First hand weeding at 14-21 days after
transplanting (DAT)
• Use rice weeding handheld equipment
• Second hand weeding at 40 DAT
14. • Promote the use of plant-based
products (biopesticides)
• Entomopathogenic fungi as
alternatives to synthetic pesticides
• Indiscriminate use of pesticides
• Concerns on food, environment and natural
resource management (soil, water, beneficials)
Pesticide use in crop production systems
15. Pest management
• Pest management is therefore a means to reduce pest numbers
to an acceptable threshold
• An acceptable threshold, in most cases, refers to an
economically justifiable threshold
• This is where application of pest control measures reduces pest
numbers to a level below which additional applications would
not be profitable
• This means when additional costs of control exceed additional
benefits)
• Pest eradication (i.e. complete removal) is usually not a viable
option.
16. Integrated Pest Management (IPM)
• Integrated Pest Management (IPM) is an effective
and environmentally sensitive approach to pest
management that relies on a combination of
wholistic approach / practices
• IPM programs use current, comprehensive
information on the life cycles of pests and their
interaction with the environment
17. Management options of rice insects
Varietal
resistance/tolerance
BiopesticidesCultural
practices
Biological
control
18. Africa Rice Gall Midge (AfRGM)
The African rice gall midge (AfRGM),
Orseolia oryzivora Harris and Gagné
(Diptera: Cecidomyiidae) is a serious
insect pest of rainfed and irrigated lowland
rice in Africa
It is a bud borer and larval feeding insect
causing severe damage to rice during the
vegetative stages (seedling to panicle
initiation)
19. AfRGM pupa AfRGM Adult
AfRGM eggs with newly
hatched larva
AfRGM larva in a dissected
gall
20. Hot spots
Senegal
- Djibelor
nr Ziguinchor
- Southwest
- Sudan savanna
Sierra Leone
- Rokupr nr Kambia
- Northwest
- Humid forest zone
Burkina Faso
- Karfiguéla nr
Bobo Dioulasso
- Southwest
- Northern Guinea
savanna
- Longorola nr Sikasso
- Southeast
- Northern Guinea
savanna
- Gadza nr Bida
- Central
- Southern
Guinea
savanna
Nigeria
- Ogidiga nr
Abakaliki
- Southeast
- Derived
savanna
Mali
Distribution of the AfRGM in Africa
Endemic countries
Senegal
Gambia
Guinea Bissau
Guinea
Sierra Leone
Burkina Faso
Mali
Côte d’Ivoire
Ghana
Togo
Benin
Nigeria
ChadNiger
Tanzania
Cameroon
Malawi
Sudan
Uganda
Zambia
Countries with AfRGM incidence
22. Paddy screenhouse -artificial infestation
Conventional ‘spreader
rows’ – rows of highly
susceptible variety around
plots of plants being
screened; newly hatched
larvae deposited on
‘spreader’ plants
Scores shown are mean
percent tiller infestation
(tillers with visible galls)
recorded at 70 DAT
Design: augmented with 2
replicated checks (test
lines unreplicated)
23. Varietal Resistance
What are the Issues?
•High yielding rice varieties with stable resistance to
AfRGM are not yet available
•Are there potentially useful sources of resistance /
tolerance in lowland NERICA lines and Oryza sativa
to AfRGM?
•TOG 5681, TOG 7106, TOG 7206, T0S 14519 are
some of the resistant varieties while ITA 306 is
susceptible variety
24. Levels of resistance / susceptibility
Score SES description % Tiller
infestation
0 Highly resistant 0%
1 Resistant <1%
3 Moderately resistant 1 - 5%
5 Moderately susceptible 6 -10%
7
9 Highly susceptible >25%
Standard Evaluation System (SES), IRRI, 1996
Susceptible 11-25%
Percent tiller infestation on the susceptible check should on the
average be more than 15% for trial results to be considered valid
25. Accomplishments
● Donors for resistance/tolerance to AfRGM
identified
● Mechanisms associated with
resistance/tolerance in rice lines to AfRGM
determined
● Lowland NERICAs and Chinese hybrids
characterized for resistance/tolerance to
AfRGM
26. Stem borers
• They are considered to be the most important insect pests
of rice in west Africa and are found in all ecosystems
• Stem borer species which cause serious damage to rice
include:
– African pink borer, Sesamia calamistis
– African white borer, Maliarpha separatella
– African striped rice borer, Chilo zacconius
– Stalk-eyed fly, Diopsis longicornis
• Damage is caused by the boring activity of the larvae within
the stem during the vegetative and reproductive stages of
plant growth
29. Key Issues
•Most of the traditional Oryza sativa varieties grown in
Africa are low yielding and highly susceptible to stem
borers
•AfricaRice has generated several hundred NERICA
lines, opening new gene pools and increasing the
biodiversity of rice to end-users
•However, we do not know how resistant these
NERICA lines are to stem borers
•Are NERICAs more or less vulnerable to stem borer
damage than the landraces they are about to replace ?
30. •Rice mixed with maize is a
common feature of traditional
upland rice cultivation in some
West African countries
•Rice and maize share some
common stem borer species
•Can maize be used as a trap
crop to protect rice against stem
borers?
Key Issues
31. Key Issues
•Sesamia calamistis Hamp. is a major stem borer
pest of upland rice in Africa
•IITA has identified an indigenous endoparasitoid
Cotesia sesamiae for biological control of maize
stem borer. Maize and rice share common stem
borer – Sesamia calamistis
•Can Cotesia sesamiae be used to protect rice
against Sesamia calamistis?
32. Biological control of Sesamia
calamistis by the endoparasitoid
Cotesia sesamiae
Cotesia sesamiae
Larval parasitoid
Cotesia sesamiae
Sesamia calamistis
33. Termites
• Most significant soil pests of rice in Africa and are mainly
found in the upland rice ecosystem. The most damaging in
Nigeria is Macrotermes spp.
• Damage is caused by the adults (workers) that consume
the roots and fill the stem with soil. The reduced
translocation of water and nutrients causes the attacked
plant to dry up and die
• Termite damage on rice roots can also predispose the roots
to secondary infection or invasion by pathogens
• Yield losses of about 50% to 100% have been attributed to
termites in farmers’ fields
35. Pawpaw mixed
with red palm oil
• Ripe and unripe pawpaw were diced and mixed with
red palm oil
• Application was made along the rows of rice plants
• Application was made 25 DAS and every 20 days till
maturity
Biological control of termites
36. Bamboo
Bamboo stems of 500 cm length were
buried 200 cm deep in the soil at a spacing
of 0.5 m in all directions
Cultural control of termites
37. Distribution of RYMV in Africa
Mauritania
Senegal
Gambia
Guinea Bissau
Guinea
Sierra Leone
Burkina Faso
Mali
Liberia
Côte d’Ivoire
Ghana
Togo
Benin
Nigeria
ChadNiger
Kenya
Tanzania
Madagascar
Cameroon
Rwanda
Countries with RYMV incidence
Endemic countries
38. How is the virus transmitted?
The virus is mechanically transmitted – gains
entry into rice plants through injuries. The
possible roots of entry are:
Root damage during transplanting and roots
intertwining in the soil
Weeding operations with hoes
Harvesting with sickle
Insects
39. 11
22
33
feed on an infected plant
collect the virus particles
pass them on to the next plant that they
feed on
The virus does not undergo any changes
within the insect itself, but simply uses it as a
vehicle – semi persistent
The insect species
Why focus on insect vectors?
40. Chaetocnema pulla Trichispa sericea Oxya hyla
Locris rubraConocephalus longipennisChnootriba similis
Insect vectors of RYMV
41. Nature of damage of rice leaves by
vectors
1. Chaetocnema pulla
2. Trichispa sericea
3. Oxya hyla
1 2 3 4
5
4. Chnootriba similis
5. Conocephalus longipennis
42. Research Products cont.
Technologies/methodologies
● Growing maize as a trap crop for rice
stem borers in West Africa (Nwilene et al.,
2008)
● IPM technologies for termite control now
available (Nwilene et al., 2008)
● New methodology for screening rice
varieties resistant/tolerant to RYMV using
insect vectors (Sere et al., 2008)
43. Research Products cont.
New ideas/concepts/paradigms developed
Functional Agrobiodiversity
Habitat management – planting of Paspalum
scrobiculatum around rice fields to increase the
reservoir of AfRGM parasitoids early in the
season and throughout the cropping period.
This is a simple cultural intervention developed
to control AfRGM (Nwilene et al., 2007, 2008)
44. Thank you! Merci!
07th August, 2015 Presentation @Musa Room IITA, Ibadan
Center of Excellence for Rice Research
Hinweis der Redaktion
Occurrence of major insect pests in rice ecologies. Because of this constraints, the intensification practices of smallholder farmers are unsustainable.
All are indigenous to Africa, except Maliarpha
We need to understand how this species coexist in agro-ecosystems and the role it plays play in protecting the rice crop.