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ŠUMARSKI LIST 7-8/2010 str. 68     <-- 68 -->        PDF

A. Mešić, T. Gotlin Čuljak, T. Miličević: DINAMIKAPOPULACIJE INVAZIVNE VRSTE ... Šumarski list br. 7–8, CXXXIV (2010), 387-394

SUMMARY: The paper deals with the biology of horse chestnut lefminer in
central Croatia in three different towns within a circle of 150 km – Sisak, Zagreb
and Čakovec. The data were collected by using pheromone traps and visual
examinations of horse chestnut leves during the period of 2001–2008.
Opposite to earlier assumptions, the horse chestnut leaf miner moth develops
four and more seldom three generations annually in central Croatia. This is
clearly presented in graphs 1–3, that show the horse chestnut male moth’s
flight dynamics. The first generation moth’s flight starts in the last decade of
April and lasts until the end of May; the second generation’s moths fly during
June and the first two decades of July. Third generation of moths appear from
the end of July until the end of August, and fourth generation from the middle
to the end of September. During the eight years research, the fourth generation
wasn’t recorded only in one year in two of three towns. Average duration of
each developing period of horse chestnut leaf miner in Zagreb is presented in
table 2. The second generation of horse chesnut monts is more numerous thent
the first and the third one, while the fourth generation is even smaller. It was
observed that the first generation’s females lay their eggs mainly on the upper
sides of leaves of the lower third of the horse chestnut tree crown. Females of
the second, third and fourth generation laid eggs on higher parts of the crowns,
although their eggs can also be found on lower levels of the foliage.

Key words:horse chestnut, flight dynamics, duration of development