Post on 04-Jun-2020
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Biological control of pink cassava mealybug,
in Thailand
Amporn Winotai
Plant Protection Research and Development Office
Department of Agriculture, Thailand
Background
• The 1st report of outbreak was made in April, 2008; 120,000 acres found damaged, increase to 500,800 acres in 2010
• What species it is?
• How to keep the pest under control?
4 projects developed
1. Identification of CMB2. Chemical control 3. Biological control4. IPM
Cassava Production during 2009-10
YearHarvesting area (ha)
Total yield (M-ton)
Yield/ha (ton)
2009 1.33 30.90 3.63
2010 1.17 22.01 3.01
Reduction (%)
11.94 28.77 17.08
Chemical control
1. Foliage spraying:Negative side-effect to NEs
2. Soaking of Plant material:
• Thiamethoxam 25%WG (4 gm)
• Thiamethoxam 35%FS (3 ml)
• Imidacloprid 70%WG (4 gm)
• Imidacloprid 60%FS (5 ml)
• Clothianidin 16%SG (30 gm)
Damage occurred in Africa
1. Bunchy top & plant distortion
2. Yield losses up to 80%
3. Lack of plant materials
4. Yield reduction
• Scientific name: Anagyrus lopezi
• Native to South America
• Introduced for BC in Nigeria in 1981
• Successful control occurred in 25 countries in West Africa
Anagyrus lopezi
Male Female
Introduction of A. lopezi
• 500 lopezi wasps were imported to Thailand under cooperation with IITA-Benin on 30 Sept. 09,
• Checking for contamination of other insect & host specificity test
• Small field released and evaluation
Mass rearing on
cassava plants
45 days
25 days11-25 days
7 days
11-25 days
Mass rearing on pumpkins
15 C
Activities done
• Organizing Training Courses
• Establishment of parasitoid mass rearing units under government and private facilities
• Mass produce of lopezi wasps and release in target areas
• 300 pairs/ hectare was recommended
0
100,000
200,000
300,000
400,000
500,000
600,000
700,000
2009
2010
2011
2012
2013
Infested Areas during 2009 – 2013In
fest
ed a
reas
(A
cre)
Releases of lopezi wasps in July 2010, reduced infested area from 500,800 acres to 161 acres in May 2013
Started releasing lopezi
wasps (July 2010)
• Dr. Gillian Watson, California
Department of Food and Agriculture
• IITA-Benin
• Dr. Peter Neuenschwander
• Dr. Georg Georgen
• TTDI
Acknowledgements