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Some quantitative consequences of poplar rust attacks (Melampsora larici-populina and M. allii-populina) were analysed, both in absence and in presence of some preventive chemical treatments. Their effectiveness was previously assessed only partially and without evaluations of plant behaviour in the following vegetative season. Three IBS systemic triazoles (tebuconazole, cyproconazole and epoxyconazole), the translaminar cytotropic mandipropamid and a mixture of cyproconazole and azoxystrobin (methoxyacrilate similar to strobilurines) were tested on one-year plantlets of the susceptible clone ’ÂÂNeva’ (Populus ×canadensis). The products were sprayed twice in August 2010, the second treatment twenty days after the first one. The leaf area covered by uredinia was assessed in several dates from the beginning of August until the end of September, as well as the percentage of still living leaves on the plant (last ten days of October). In May 2011, the average leaf surface of side shoots close to the top of the crown and the Chlorophyll Content Index (CCI) were measured. The tested fungicides dramatically reduced the infections, except mandipropamid which showed no effectiveness. Tebuconazole and cyproconazole, either alone or in mixture with azoxystrobin, have offered the best performance (at the end of September, less than 10% of leaf surface covered by uredinia vs. over 50% of the control and mandipropamid treatment), followed by epoxyconazole that is anyway satisfying (about 15% of surface covered by uredinia). The systemic properties of these fungicides allowed a preventive action on leaves sprouted after both of the treatments as well, thus uredinium eruption was limited to 20% of leaf surface instead 40% on the test thesis. The same effectiveness ranking was reiterated for the percentage of still living leaves on the plant at the end of October (about 45% vs. 4% of the control test) and, during the following season, for the average leaf surface of side shoots (over 800 cm2 vs. less than 400 cm2 of the test) and for the CCI parameter (over 21 vs. 16). Thus, the phylloptosis induced by rusts involves a seriously impaired leaf sprouting during the season following the attacks, both as regards tissue amount and its photosynthetic efficiency

Direct and indirect effects of chemical treatment against poplar rust attacks