Effectiveness of Eucalyptus camaldulensis and
Cymbopogon citratus essential oils in protecting
rice stocks from Sitophilus...
OUTLINE
Introduction
Material & methods
Results
Conclusion
INTRODUCTION


Rice production

• Rice is a staple food for
millions of people in Africa

•

Since 2008 its cropping area...
INTRODUCTION
 Storage issues

• Rodents, insects, fungus, abiotic
factors, etc.

• Quantitative losses due to
insects rea...
INTRODUCTION
The objective of this study is:
To develop alternative technologies (to
chemical methods) for an effective in...
MATERIAL & METHODS
Animal material:
Sitophilus oryzae
(Coleoptera: Curculionidae)

Larve

Adulte

Sitotroga cerealella
(Le...
Plant material:
Eucalyptus camaldulensis
(Myrtaceae)

Cymbopogon citratus
(Poaceae)

Essential oil

7
• Impregnation of gunny bags
(sacs en jute)

Alcohol
Eucalyptus camaldulensis
3%, 4%, 5%, untreated check,
Check with alco...
• Treatment of cotton bags (sacs en cretonne)
Cymbopogon + cotton bag ( dose : 0.25ml/bag)
Eucalyptus + cotton bag ( dose ...
Data collected at 90 days after treatment:

• Population of emerged adults
• Percentage of weight loss (%)

10
RESULTS
Table 1: Effect of essential oils on Sitophilus oryzae and Sitotroga
cerealella population emerged in stored paddy...
Weight losses of paddy rice (%)

10

a

a

8
6
4

b
c
d

2
0

Figure 1: weight losses recorded 90 days after storage in ga...
Table 2: Impact of cotton bags treatment on paddy rice weight losses
(Sacs en cretonne).

Traitements
Check with cotton ba...
CONCLUSION
The use of the essential oils of C. citratus and E.

camalsulensis appeared to be a promising method for
protec...
Thank you for your kind attention
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The3_Effectiveness of Eucalyptus camaldulensis and Cymbopogon citratus essential oils in protecting rice stocks from Sitophilus oryzae and Sitotroga cerealella.

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3rd Africa Rice Congress
Theme 3: Rice processing and marketing
Mini symposium: improving rice processing technologies in Africa
Author: Togola et. al.

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The3_Effectiveness of Eucalyptus camaldulensis and Cymbopogon citratus essential oils in protecting rice stocks from Sitophilus oryzae and Sitotroga cerealella.

  1. 1. Effectiveness of Eucalyptus camaldulensis and Cymbopogon citratus essential oils in protecting rice stocks from Sitophilus oryzae and Sitotroga cerealella. A. Togola, P.A. Seck, F.E. Nwilene, I.A. Glitho et D. Chougourou
  2. 2. OUTLINE Introduction Material & methods Results Conclusion
  3. 3. INTRODUCTION  Rice production • Rice is a staple food for millions of people in Africa • Since 2008 its cropping area and production have increased in West Africa (FAOSTAT, 2011) • Unlike the pass , rice is more and more stored for seeds, consumption and trade
  4. 4. INTRODUCTION  Storage issues • Rodents, insects, fungus, abiotic factors, etc. • Quantitative losses due to insects reach 5% and 30% in 4 and 6 month of storage. • Qualitative losses : physical, culinary and nutritional • Economic losses: leading to the decrease in income of the actors of rice sector
  5. 5. INTRODUCTION The objective of this study is: To develop alternative technologies (to chemical methods) for an effective integrated protection of stored rice against insects pests.
  6. 6. MATERIAL & METHODS Animal material: Sitophilus oryzae (Coleoptera: Curculionidae) Larve Adulte Sitotroga cerealella (Lepidoptera: Gelechiidae) Larve Adulte
  7. 7. Plant material: Eucalyptus camaldulensis (Myrtaceae) Cymbopogon citratus (Poaceae) Essential oil 7
  8. 8. • Impregnation of gunny bags (sacs en jute) Alcohol Eucalyptus camaldulensis 3%, 4%, 5%, untreated check, Check with alcohol alone Cymbopogon citratus 3%, 4%, 5% , untreated check, Check with alcohol alone Replication: 4 • Infestation method in impregnated gunny bags 20 20 Paddy rice: 100g 8
  9. 9. • Treatment of cotton bags (sacs en cretonne) Cymbopogon + cotton bag ( dose : 0.25ml/bag) Eucalyptus + cotton bag ( dose : 0.25ml/bag) Eucalyptus + Cymbopogon + cotton bag Cymbopogon + cotton bag + plastic film Eucalyptus + cotton bag + plastic film Eucalyptus + Cymbopogon + cotton bag + plastic film Check with cotton bag + plastic film Check with cotton bag alone Rep 4 • Infestation method in cotton bags 20 20 Paddy rice: 100g 9
  10. 10. Data collected at 90 days after treatment: • Population of emerged adults • Percentage of weight loss (%) 10
  11. 11. RESULTS Table 1: Effect of essential oils on Sitophilus oryzae and Sitotroga cerealella population emerged in stored paddy rice inside gunny bags (Sac s en jute) Treatments Emerged population of S. oryzae Emerged population of S. cerealella Untreated check 51.0 ± 6.2a 345.7 ± 24,9a Check with alcohol alone C. citratus 3 % 48.1 ± 3.4a 51.5 ± 8.4a 329.6 ± 21,5a 113.2 ± 9,0b C. citratus 4 % C. citratus 5 % E. camaldulensis 3 % E. camaldulensis 4 % E. camaldulensis 5 % 37.2 ± 3.4a 21.2 ± 2.6b 20.2 ± 2.0b 15.2 ± 2.6b 9.5 ± 3.1b 98.5 ± 8,8b 88.7 ± 4,0b 263.7 ± 20,4a 280.0 ± 19,4a 266.5 ± 32,4a 11
  12. 12. Weight losses of paddy rice (%) 10 a a 8 6 4 b c d 2 0 Figure 1: weight losses recorded 90 days after storage in ganny bags impregnated withCymbopogon citratus
  13. 13. Table 2: Impact of cotton bags treatment on paddy rice weight losses (Sacs en cretonne). Traitements Check with cotton bag alone Pertes pondérales Enregistrées (%) 8,69b Check with cotton bag + plastic film 4,78ab Cymbopogon + cotton bag Eucalyptus + cotton bag Eucalyptus + Cymbopogon + cotton bag Cymbopogon + cotton bag + plastic film Eucalyptus + cotton bag+ plastic film Eucalyptus + Cymbopogon + cotton bag + PF 3,53ab 3,88ab 4,79ab 3,14ab 3,76ab 1,83a
  14. 14. CONCLUSION The use of the essential oils of C. citratus and E. camalsulensis appeared to be a promising method for protecting stored rice against S. cerealella and S. oryzae. However, the method needs some improvement in order to make the technology cheaper for a large access by end users. 14
  15. 15. Thank you for your kind attention

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