Cameraria ohridella, Horse Chestnut Leaf-miner
Russell IPM manufacture and supply pheromone lures, traps and complete monitoring systems for Camerario ohridella, the horse chestnut leaf-miner. Accurate monitoring is essential to minimise damage and protect crops. Therefore, installation of pheromone traps will ensure you are alerted to the presence of unwanted pests at an early stage, detecting the insects before they become a major problem and enabling timely and effective treatment.
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D'Costa, L. et al., (2013) Oviposition patterns and larval damage by the invasive horse-chestnut leaf miner Cameraria ohridella on different species of Aesculus. Ecological Entomology, 2013.
Preference–performance relationships are thought to be particularly important for sessile herbivores, such as leaf miners, whose choice of host plant is entirely determined by the ovipositing female. However, this relationship has seldom been examined between a non-native herbivore and non-native host plants. Leaf damage and oviposition patterns by the invasive horse-chestnut leaf miner, Cameraria ohridella Deschka & Dimic, 1986 (Lepidoptera: Gracillariidae), were investigated on 11 different species of Aesculus L. (Sapindaceae) at the Royal Botanic Gardens, Kew. The tree species studied were of different continental origin and belonged to four different sections of the genus Aesculus. Oviposition was recorded on all the investigated species of Aesculus, with egg densities being greatest on Aesculus hippocastanum L. and Aesculus turbinata Blume. By contrast, mines were formed on only six out of the 11 studied species. Host suitability for C. ohridella was related to the phylogeny of the genus Aesculus. Species belonging to the section Aesculus were susceptible to the leaf miner; species in the section Pavia showed variable susceptibility; and species in the section Calothyrsus and Macrothyrsus were found to be resistant.Read more
Pocock, M. & Evans, D. (2014), The Success of the Horse-Chestnut Leaf-Miner, Cameraria ohridella, in the UK Revealed. PLOS One, 2014.
The study addresses two hypotheses, and found that (1) the levels of damage caused to leaves of the horse-chestnut tree, Aesculus hippocastanum, and (2) the level of attack by parasitoids of C. ohridella larvae were both greatest where C. ohridella had been present the longest. Specifically there was a rapid rise in leaf damage during the first three years that C. ohridella was present and only a slight rise thereafter, while estimated rates of parasitism (an index of true rates of parasitism) increased from 1.6 to 5.9% when the time C. ohridella had been present in a location increased from 3 to 6 years. We suggest that this increase is due to recruitment of native generalist parasitoids, rather than the adaptation or host-tracking of more specialized parasitoids, as appears to have occurred elsewhere in Europe. Most data collected by participants were accurate, but the counts of parasitoids from participants showed lower concordance with the counts from experts. We statistically modeled this bias and propagated this through our analyses. Bias-corrected estimates of parasitism were lower than those from the raw data, but the trends were similar in magnitude and significance.Read more