Reproductive potential of the poplar leaf beetle (Chrysomela populi L. 1758) under different temperatures
2015
Váradi, Melinda (University of West-Hungary, Sopron (Hungary). Institute of Silviculture and Forest Protection) | Tuba, Katalin (University of West-Hungary, Sopron (Hungary). Institute of Silviculture and Forest Protection)
Poplars and willows are the most frequent tree species as energy crops in Hungary. In other European countries the activities are also focused on these fast growing species. The poplar leaf beetle (Chrysomela populi L. 1758) is one of the most abundant and important defoliator pests in these short rotation forests. It occurs usually in young plantations and nurseries, causing damages. It is widespread all over Europe. In these cases the most important duty of the forestry management is to ensure and also to optimize the mean annual growth. An intensive plantations usually are monoclonal and due to that they are vulnerable on attach by insects therefore successful forest management cannot carry out in these fields without plant protection. In this work the fecundity of the poplar leaf beetle was investigated under laboratory conditions. The hibernated adults were collected in March 2014 before the growing season. During the examination the developmental characteristic of 30-30 individuals were observed in three different temperatures (20°C, 25°C, 30°C) and under 16:8 photoperiod. The adults were raised on each temperature, feeding on the same food (leaves of Populus x euramericana cl. Pannonia). We measured the weight changes of the adults in each third day, as well as before and after the oviposition, the number of eggs by each female. The results represent the egg number of each egg mass, the average time among the ovipositions. They showed that the temperature has significant influence on the fecundity of the poplar leaf beetle.
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