The effects of shade, altitude and
landscape composition on coffee
pests in East Africa
Mattias Jonsson
Dept. of Ecology/ ...
Acknowledgements

Louise Malmberg & Nina Backlund

Ijala Anthony Raphael
How can we expect agroforestry practices to
influence pests?

+

Agroforestry plantations are more complex than monocultur...
Study 1
Effect of shade at different altitudes
in eastern Uganda

X
Mt Elgon

Altitude (2 levels)

Shade (3 levels)
Shady plantations had highest infestation of
stemborers, especially at low altitudes

White stem borer
(Monochamus leucono...
Shady plantations had lowest infestations of
coffee berry borer

Coffee berry borer
(Hypothenemus hampei)

Local shade: *
...
Study 2
Effect of shade in landscapes with different cover
of trees in western Kenya

X
Tree cover in landscape
(gradient)...
The effect of local shade level depended on
landscape composition

Lacebugs
Habrochila spp.

Local shade: **
Prop tree cov...
Summary:

Are shade-trees useful for pest control in coffee?
White stemborer

NO – especially not at lower altitudes!

Cof...
Poster: Agroforestry to improve soil
health and pest management
in the humid-tropics: a meta-analysis
Positive

8

Negativ...
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The effects of shade, altitude and landscape composition on coffee pests in East Africa.

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This presentation was given by Mattias Jonsson at the World Agroforestry Congress in New Delhi. 10-14 February 2014

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The effects of shade, altitude and landscape composition on coffee pests in East Africa.

  1. 1. The effects of shade, altitude and landscape composition on coffee pests in East Africa Mattias Jonsson Dept. of Ecology/ Centre for Biological Control Swedish University of Agricultural Sciences (SLU), Uppsala, Sweden Coauthors: Ijala Anthony Raphael, Nina Backlund, Louise Malmberg, Jeninah Karungi-Tumutegyereize, Samuel Kyamanywa, Barbara Ekbom World Congress of Agroforestry, New Delhi, 2013-02-12
  2. 2. Acknowledgements Louise Malmberg & Nina Backlund Ijala Anthony Raphael
  3. 3. How can we expect agroforestry practices to influence pests? + Agroforestry plantations are more complex than monocultures reduced pest abundances (Root et al. 1973; Teodoro et al 2009; Karp et al. 2013). - Agroforestry plantations may provide alternative habitat and a favorable envirionment increased pest abundances (Girma 2000). +/- The impact of agroforestry may depend on ecological context (Tscharntke et al. 2012).
  4. 4. Study 1 Effect of shade at different altitudes in eastern Uganda X Mt Elgon Altitude (2 levels) Shade (3 levels)
  5. 5. Shady plantations had highest infestation of stemborers, especially at low altitudes White stem borer (Monochamus leuconotus) Local shade: ** Prop tree cover: NS Local shade X prop tree cover : *
  6. 6. Shady plantations had lowest infestations of coffee berry borer Coffee berry borer (Hypothenemus hampei) Local shade: * Prop tree cover: NS Local shade X prop tree cover : NS
  7. 7. Study 2 Effect of shade in landscapes with different cover of trees in western Kenya X Tree cover in landscape (gradient) Shade (2 levels)
  8. 8. The effect of local shade level depended on landscape composition Lacebugs Habrochila spp. Local shade: ** Prop tree cover: NS Local shade X prop tree cover :
  9. 9. Summary: Are shade-trees useful for pest control in coffee? White stemborer NO – especially not at lower altitudes! Coffee berry borer Which pest is most important? YES! Doesn’t matter Lacebugs What does the landscape look like? NO!
  10. 10. Poster: Agroforestry to improve soil health and pest management in the humid-tropics: a meta-analysis Positive 8 Negative No effect 7 Number of data points 7 6 5 5 4 4 3 2 2 2 1 1 0 Reduction of pest abundance Reduction of plant damage Very few studies have tested the effect on pest control!

×