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MINAŘ, P.: Effect of late summer treatments by strobilurines on storage diseases of apples. Acta univ. agric. et silvic. Mendel. Brun., 2006, LIV, No. 4, pp. 39–44 Biological effi cacy of strobilurines (trifl oxystrobin and kresoxim-methyl) was evaluated to compare the effect of late treatments of apples against post-harvest diseases with the effect of widely used reference products (captan, tolylfl uanid, dithianone, dodine). One treatment 3–4 weeks before the harvest was applied (1000 l/ha water). Tested and reference products were used in doses authorised in the Czech Republic against the apple scab (Venturia inaequalis). Strobilurines effectiveness overcame all the products compared and showed an effect on reduction of weight decrease during the storage. In total 8 fi eld tests were performed in 2000–2004 were effi cacy, effect on fruit quality and weight decrease during storage was assessed. apple, storage diseases, fungicides, strobilurines Apple diseases of the late summer and post-harvest diseases can cause severe damages on fruit during the storage. The infection pressure and the occurrence of individual pathogens differ between years, however under conditions favourable for their development the quality and quantity of stored apples can be reduced. More than 90 fungal species have been described that cause decay of apples during storage. Temperatures and rainfall during late summer, sufficient chemical protection before the harvest, timing and method of harvest, mechanical damage during the harvest and manipulation as well as conditions in the store are the main factors affecting occurrence of post-harvest diseases on apples. Most of present studies on the effect of the last preharvest treatment on the infection pressure of apple post-harvest diseases evaluated the effectiveness of fungicidal preparations and substances of the older type, i.e. benzimidazoles, imidazoles, dialkyldithiocarbamates and ftalimides. Possibilities of use against post-harvest diseases of apples of environmentally and toxicologically more prospective active ingredients from the chemical group of strobilurines have not been evaluated suffi ciently yet and results of strobilurin effects available are not consistent (Agnello et al., 1999; Lanský, 2000). The current study was conducted to compare the effi cacy of the range of plant protection products available for the late treatments of apple trees in the Czech Republic. It was focused especially on the effi cacy evaluation of trifl oxystrobin and kresoximmethyl which are now commonly used for the protection of apple trees against the apple scab. Individual preparations reference and tested were chosen to enable the comparison with studies conducted by Research Institute of Fruit Growing in Holovousy in 1997–2000 (Lanský, 2000). MATERIAL AND METHODS Tests were performed following OEPP/EPPO standard guideline PP 1/18 (1996) (Storage diseases of apples – Pre-harvest application) and further general OEPP/EPPO standards PP 1/152 (1998) (Design and Analysis of Effi cacy Evaluation Trials) a OEPP/EPPO PP 1/18 (1996) (Conduct and Reporting of Effi cacy Evaluation Trials).