ISHS Acta Horticulturae 491: International Symposium Greenhouse Management for Better Yield & Quality in Mild Winter Climates
THE POPULATION GROWTH OF PESTS AND THEIR BENEFICIALS IN CUCUMBER PLASTIC TUNNELS IN THE IZMIR REGION OF TURKEY |
| Authors: | N. Yasarakinci, P. Hincal |
| Keywords: | Bemisia tabaci, Aphis gossypii, Liriomyza spp., Tetranychus cinnabarinus, Thrips, natural control |
| Abstract:
The studies were made in cucumber glasshouses in Menderes and Bornova of Izmir province in 1996. The population growth of Bemisia tabaci Gern, Aphis gossypii Glover, Liriomyza huidobrensis (Blanchard), Tetranychus cinnabarinus (Boisd), Thrips tabaci (Lindeman) and Frankliniella occidentalis (Pergande) were followed. The leaf miner population began to develop at the beginning of the vegetation. It was found that the 50–98% parasitism ratio was suppressed the leaf miners population density. Thrips population increased in the seedling stage and then population density decreased. It is considered that the thrips were controlled by the predators. Whitefly population was increased in June-July. Aphid appeared in May-June and increased at the beginning of July. The aphid density reached the treatment threshold and damaged the plants. Although there were beneficial species they could not suppress the population density of the aphids. Spider mite appeared at the beginning of the season, and increased in the middle of July. Spidermite also reached the treatment threshold and gave harm to the plants. The plants faded because of the aphid and spidermite damages. Asymmetrasca decedens Paoli and Henosepilacna elaterii (Rossi) were recorded at a very low level. | |
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