Effect of distance between host trees and leaf litter removal on population density of Cameraria ohridella Deschka and Dimic, 1986 [Lepidoptera, Gracillariidae] - pest of chestnut [Aesculus sp.] trees

• Autorzy: Baraniak E , Walczak U. , Tryjanowski P. , Zduniak P.
• Języki publikacji: EN

Abstrakty

EN

The influence of distance between host trees and leaf litter removal on population density of Cameraria ohridella have been for the first time examined in an isolated population of horse chestnut (Aesculus hippocastanum L.) trees. The observation was performed in the small town (area 13,58 km²) in Wielkopolska region (West Poland) on the total number of 49 trees: 31 (11 clumps) of them with autumnal leaves removal (controlled sites), and 18 (5 clumps) without this procedure (uncontrolled sites). The main factors determining the extent of the leaf destruction by larvae were the leaf litter removal and the number of subsequent generations on a given tree. The effect of mean distance between trees on the infestation level was statistically significant only for the third generation larvae, when analyzing all sites. There was no significant correlation when checking the impact of mean and short distance on the leaves infestation between controlled and uncontrolled sites. The abundance of the first generation of the larvae of raked sites is possibly a result of low number of in situ overwintering individuals and the number of immigrants from uncontrolled areas. Assuming the random choice of direction of the migration, the effect of the immigrants on the trees which leaves have been disposed of is not as high as it should be expected. Additionally, the moths can be blown away by the wind in a random direction. Consequently, the noted increase in the leaves infestation by the third generation larvae can be result of the rate of population increase innate for the species and only partly a result of immigration from refuge areas.

Słowa kluczowe

EN

Lepidoptera; pest; population density; host tree; Aesculus; tree; leaf litter; Cameraria ohridella; chestnut; Gracillariidae

• Wydawca: -
• Czasopismo: Polish Journal of Ecology
• Rocznik: 2004
• Tom: 52
• Numer: 4
• Opis fizyczny: p.569-574,fig.,ref.

Twórcy

autor

Baraniak E

• Adam Mickiewicz University, Fredry 10, 61-701 Poznan, Poland

autor

Walczak U.

autor

Tryjanowski P.

autor

Zduniak P.

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