Puna-apilan siementuholaisten esiintyminen ja runsaus Suomessa v. 1936

Authors

• Martti Markkula Maatalouden tutkimuskeskus, tuhoeläintutkimuslaitos ja kasvinviljelylaitos, Tikkurila
• Otto Valle Maatalouden tutkimuskeskus, tuhoeläintutkimuslaitos ja kasvinviljelylaitos, Tikkurila

DOI: https://doi.org/10.23986/afsci.71491

Abstract

The article discusses results obtained in 1936 from red clover head material collected in southern and central Finland (188 samples from 111 communes, each sample containing 100 flower heads). The following insect pests were found in the samples: Apion apricans Herbst. A. assimile Kirby, A. trifolii L., Phytonomus nigrirostris Fabr., Ph. meles Fabr., Dasyneura leguminicola Lintn. and Haplothrips niger Osb.; in addition the species Apion flavipes Payk., which is ordinarily a pest of alsike and white clover, was also present to some extent. The most abundant species of these pests were the clover weevils Apion apricans and A. assimile, reaching a total of 10 739 individuals. The former weevil comprised three-fourths of this number and the latter one-fourth. These species were most abundant in the central and eastern parts of the country and were found in increasing numbers as the age of the ley increased. The results are compared to those obtained in 1958 from corresponding red clover head material collected by the Department of Pest Investigation and are found within certain limits to be closely similar.