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Volume 13 Issue 4
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Article Navigation >  Forest Research  > 2000 >  13(4): 416-422

Citation:
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A Preliminary Study on the Use and Protection of the Natural Enemies of Insect Pests in the Seed Stands of Picea crassifolia

  • 1.

    Management Bureau of the Natural Reserve of Qilian Mountain, Zhangye 734000, Gansu, China

  • 2.

    Forest Seed and Seedling Management Station of Gansu Province, Lanzhou 730046, Gansu, China

  • 3.

    Forest Pest Control and Quarantine Station of Gansu Province, Lanzhou 730050, Gansu, China

  • 4.

    Forestry Bureau of Tianz huZang Nationality Autonomous County, Gansu Province, Tianzhu 733200, Gansu, China

  • Received Date: 1999-04-08
  • One hundred and thirty five species (including subspecies) of natural enemies of the insect pests in the seed stands of Picea crassifolia Kom.in the Qilian Mountains in Qinhai Province were collected and identified.Among them 54 species were parasitoids and 81 predatory insects.The major species of the natural enemies of the important pests and the 14 species of the parasitoids of Pseudotomides strobibellus, which is the predomitory species of the seed and cone pests,were found.The total parasitic rate is 10%～60%,primarily by Scambus sp., Megashyssa sp.and Hyssopus nigritulus. Collecting the damaged seed cones in the on year and releasing parasitoids in the off year can increase the parasitic rate to 36.5%～38.2% and decrease the rate of damaged seed cones to 55.1%.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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A Preliminary Study on the Use and Protection of the Natural Enemies of Insect Pests in the Seed Stands of Picea crassifolia

  • 1. Management Bureau of the Natural Reserve of Qilian Mountain, Zhangye 734000, Gansu, China
  • 2. Forest Seed and Seedling Management Station of Gansu Province, Lanzhou 730046, Gansu, China
  • 3. Forest Pest Control and Quarantine Station of Gansu Province, Lanzhou 730050, Gansu, China
  • 4. Forestry Bureau of Tianz huZang Nationality Autonomous County, Gansu Province, Tianzhu 733200, Gansu, China
  • Received Date: 1999-04-08
  • Available Online: 2012-03-17

Abstract: One hundred and thirty five species (including subspecies) of natural enemies of the insect pests in the seed stands of Picea crassifolia Kom.in the Qilian Mountains in Qinhai Province were collected and identified.Among them 54 species were parasitoids and 81 predatory insects.The major species of the natural enemies of the important pests and the 14 species of the parasitoids of Pseudotomides strobibellus, which is the predomitory species of the seed and cone pests,were found.The total parasitic rate is 10%～60%,primarily by Scambus sp., Megashyssa sp.and Hyssopus nigritulus. Collecting the damaged seed cones in the on year and releasing parasitoids in the off year can increase the parasitic rate to 36.5%～38.2% and decrease the rate of damaged seed cones to 55.1%.

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