7th November 2014 : Damages on chestnuts trees

Work in progress - At the moment

A little side-note during the harvest...The picture in this article shows two chestnut trees side by side.The one on the right has been attacked by Cameraria Ohridella."The horse-chestnut leaf miner (Cameraria ohridella) is a leaf-mining moth of the Gracillariidae family. The horse-chestnut leaf miner was first observed in Macedonia in 1984, and was described as a new species in 1986. Its larvae are leaf miners on the Common Horse-chestnut (Aesculus hippocastanum). [...] The Cameraria ohridella causes significant damage, mainly late summer browning, to the appearance of horse-chestnut trees. Despite the poor appearance of these infested trees, there is no evidence that damage by the moth leads to tree death. Seed weight, photosynthetic storage and reproductive capacity may however be reduced.” (Wikipedia.org)One of the control methods mainly consists in raking dead leaves and burning them, so as to prevent larvae to develop from one year to the following one. Another control method consists in setting up pheromone traps.On this avenue of trees located in Le Muy, some pheromone traps have been set up on every other tree, even though the technical documentations recommend setting them up every tree out of three this year.However, that also depends on the size of the trees, the prevailing winds, the environment in general or possibly any other parameters that can be difficult to predict.In any case we will undoubtedly to set up pheromone traps on each tree next year. We will also have to make sure that the capsules are replaced every 3 or 4 weeks.The picture shows the efficiency of such a trap...


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