Volume 3
Issue 2
Horticulture
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Available Online: http://www.ejpau.media.pl/volume3/issue2/horticulture/abs-03.html
OBSERVATIONS OF THE POPULATION DYNAMICS OF APHIS SPIRAEPHAGA MŰLL. (HOMOPTERA, APHIDIDAE) ON THE SHRUBS OF SPIRAEA VANHOUTTEI ZABEL., S. ARGUTA ZABEL., AND S. SALICIFOLIA L.
Bożenna Ja¶kiewicz
ABSTRACT
The subject of studies conducted in the years 1994-1996 were observations on the occurrence of Aphis spiraephaga Müll. on three spirea species: Spiraea vanhouttei Zabel., S. arguta Zabel. and S. salicifolia L. Aphids were most numerous on the examined shrubs in 1995, while their lowest numbers were observed in 1994. It was also found out that these aphids colonised the shrubs of S. vanhouttei in the highest degree, being rare on S. salicifolia. The effect of weather (heat, drought, showers of rain) on the number and dynamics of the aphid population concerning the place and period of feeding was greater on S. vanhouttei and S. arguta as compared with S. salicifolia. The damage caused by the feeding of that aphid was often reduced by the plant itself, because those shrubs grew intensively, after the aphids flew away. Newly appearing leaves were not deformed. Another factor which significantly lowered the ornamental value of the sh
Key words: Aphis spiraephaga, spireas: Spiraea vanhouttei Zabel., S. arguta Zabel. and S. salicifolia L..