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REGULATION OF THE DENSITY OF THE INSECT-POPULATIONS IN VIRGIN-FORESTS AND CULTIVATED WOODS BY A. D. VOÛTE BIOLOGICAL LABORATORY "HOENDERLOO" i. INTRODUCTION In literature many data may be found that point to the fact that the chances of an outbreak of an insect-plague are much smaller in a virgin-forest than in a wood influenced by men, or in plantations of plants that naturally belong to the virgin-forest. Thus SCHIMITSCHEK (1940) was able to show that, in Turkey, Ips sexdentatus B6rn. only occurs in pure-woods planted by men, and not to any great extent in virgin-forests; SCHNEIDER ( i g3g) found the same with regard to Oreta carnea Saalm., a Depranid feeding on gambir belonging to the virgin-forests of Sumatra: in gambir plantations it is necessary to spray regularly with insecticides in order to keep the crops. In the virgin-forest a gradation of this caterpillar has never been observed. The research after Cryptorrhynchus gravis F. showed that this beetle does not damagingly occur in virgin-forests, whereas it does in trees planted round houses at a great distance from the forest (VOÛTE 1935). EIDMANN ( i g42, 1 g43) points out that the African virgin-forests are free from insect-pests in contrast
Archives Néerlandaises de Zoologie (in 1967 continued as Netherlands Journal of Zoology) – Brill
Published: Jan 1, 1946
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