Pine processionary caterpillar




                    Elia Hermoso de Mendoza
                    Asier Labaca
          ...
Introduction

• Scots pine (Pinus sylvestris L.) has a wide
  distribution in Europe and Asia.

• Important in economic an...
• In the study:
  – They Investigate the impact of PPC on natural
    populations of Scots pine in southern Spain


• Obje...
Biological cycle of Scots pines


April (year 0).    year 1          year 2


Flowering         Female          Cones deve...
Biological cycle of processionary

                      Cycle univoltine


                    45 days
 in mid-summer.   ...
2.- METHODS
                        Study realized


 In Trevenque area                       Studying Biological cycle
 N...
2.1.- Damages

Defoliation    January and           Larvae are in a mature
               March                 state.
  2...
2.2.3. On adult Scot pine
                                  cones,
  First:

     Observed parts of the
     pine as:     ...
Results and discussions
• PPC drastically reduces the growth and
  the reproduction of Scots pine.

• Juvenile defoliated ...
• Scots pine have lower rate of growth in
  southern Spain, so the PPC afection is
  more important.

• Also the global wa...
Conclusion and guidelines

• The effect of global warming on Scots pines because of the
  PPC will have a negative effect ...
• Short term the increased tree diversity and
  community complexity in adjacent reforested
  pine stands could greatly r...
• This task may be achieved with techniques
  already developed in situ using shrubs as nurse
  plants to increase seedlin...
Asier Labaka_Elia Hermoso de Mendoza_Arrate Etxebeste
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Asier Labaka_Elia Hermoso de Mendoza_Arrate Etxebeste

  1. 1. Pine processionary caterpillar Elia Hermoso de Mendoza Asier Labaca Ibai Sagarna Arrate Echeveste 3ºITA (HF)
  2. 2. Introduction • Scots pine (Pinus sylvestris L.) has a wide distribution in Europe and Asia. • Important in economic and ecological terms.
  3. 3. • In the study: – They Investigate the impact of PPC on natural populations of Scots pine in southern Spain • Objective: – Evaluate the consequences for forest regeneration and thereby prescribe appropriate guidelines to prevent the potential devastation of the pest.
  4. 4. Biological cycle of Scots pines April (year 0). year 1 year 2 Flowering Female Cones develop and strobili are pollination fertilized May of year 1 to January 22 months seed dispersion
  5. 5. Biological cycle of processionary Cycle univoltine 45 days in mid-summer. September autumn and winter Adult flight Eggs laid and hatch in the canopy of the trees larvae develop In the nest ---protected cold
  6. 6. 2.- METHODS Study realized In Trevenque area Studying Biological cycle National Park of Sierra Nevada Why?? of Scots PPC (2) pine (1) In 98´- 99´had a heavy Grow native Pinus defoliation by PPC Silvestris (pine processionary nevadensis caterpiller)
  7. 7. 2.1.- Damages Defoliation January and Larvae are in a mature March state. 2.2.- Sampling 2.2.1.- On juvenile Scot pine They observed the survival of the Scot pine How?? - Estimating of porcentage of defoliation suffered during the period of plague activity. - And divide the new growth by initial growth.
  8. 8. 2.2.3. On adult Scot pine cones, First: Observed parts of the pine as: flowers Two process: seeds. 1) Estimated the percentage of damage suffered during the period of plague. Measured of diametre, lengh and the number of seeds and the average weight. 2) Choose 10 pines completily defoliated and 10 with low or no defoliation. They measured
  9. 9. Results and discussions • PPC drastically reduces the growth and the reproduction of Scots pine. • Juvenile defoliated trees: – Grow 50% less than other trees – Have 50% fewer seeds – Have 40% lighter seeds
  10. 10. • Scots pine have lower rate of growth in southern Spain, so the PPC afection is more important. • Also the global warming is reducing the days with frost so larval survival of PPC is bigger.
  11. 11. Conclusion and guidelines • The effect of global warming on Scots pines because of the PPC will have a negative effect in southern Spain.   necessary to control. • Biological controls have limited effect and are expensivemethods based on self-perpetuating characteristics of the system.
  12. 12. • Short term the increased tree diversity and community complexity in adjacent reforested pine stands could greatly reduce the spread of PPC. • Long-term reforestation programmes helping both the spread towards adjacent areas as well as the migration of Scots pine in altitude will be valuable for preventing attack by PPC.
  13. 13. • This task may be achieved with techniques already developed in situ using shrubs as nurse plants to increase seedling survival   minimizing the ecological impact of reforestation on these protected high-mountain ecosystems.

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