Pests and diseases management
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Transcript of Pests and diseases management
PESTS AND DISEASES
MANAGEMENT IN
KADAHENDA, RWANDA
Kadahenda, 29 April 2016
Dieudonné Harahagazwe
1Integrated potato crop management course
Example of Potato Late Blight
Phytophthora infestans
Susceptible variety
Weather conditions
DISEASETemp. < 22°C
RH: 90-95%
Common Control practices
• Resistant/tolerant varieties
• Chemicals:
– Dithane (Mancozeb): at plant germination
(around 30DAP) and then after Ridomil at 2-
week interval
– Ridomil: 2 weeks after the first Dithane.
The second spray would occur upon onset
of LB symptoms.
12
• Fortunately it
appears late in the
crop cycle
• Therefore yield
incidence is little in
tropical highlands
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3. Integrated Control for bacterial
diseases
• Use of seed
• Plant in a healthy field
• Crop rotation with non-host plants
• Removal of diseased plants
• Removal of plant volunteers
• Application of other sanitation and cultivation
practices
4. Latent Infection
• No apparent symptoms
• Tubers carry diseases from one land to
the other
• Tolerant varieties are more prone to
latency than the sensitive ones
• Need to test seed tubers prior to planting
• Cutworms normally appear in
the field at young age of the
potato crop (20 – 40 DAP).
• Smallholder farmers are
encouraged to visit their fields
on a daily basis in a bid to
detect, collect and kill any
cutworms that show up.
4. Insecticides for aphids and
leafminer control
As recommended by the National Potato Sub-
Program, RAB-Rwanda:
• Imidachloprid 200 SL: systemic insecticide for aphid control
• CYPRO 44 EC (Profenofos 40% + Cypermethrine 4% EC)
• Jackpot 50 EC (Lambda-Cyhalothrin 50g/l): broad spectrum
insecticide for the control of biting and sucking insect pests
• Romectin 18 EC (Abamectin 18% ): Insecticide/miticide for the
control of spider mites and leafminers
Acknowledgements
We would like to acknowledge Humidtropics and the CGIAR Fund Donors
for their provision of core and project-specific funding without which this
research could not deliver results that eventually positively impact the lives
of millions of smallholder farmers in tropical Americas, Asia and Africa.
This presentation was made at a training workshop on Integrated Potato Crop
Management organized by the International Potato Center (CIP) for Innovation
Platform (IP) members of Kadahenda, Rwanda.