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A characteristic of appearance of most important diseases and insect pests of potato plants during 1958-61 in Poland and possibility of their complex control



A characteristic of appearance of most important diseases and insect pests of potato plants during 1958-61 in Poland and possibility of their complex control



Biul Inst Ochrony Roslin 16: 257-287



A study of control measures for Leptlnotarsa decemlineata, aphids and Phytophthora infestans was undertaken because of its demonstration of the value protection of potato plants. The study was based on observations and reports received during 1958-59 from inspection posts of the Institute for Plant Protection and during 1960-61 from Plant Protection Service. In case of aphids and Irish blight on potato plants the date of appearance of first winged forms or first symptoms of disease were considered, in case of L. decemlineata the hatching of larvae. The main interest in this study was to find whether use of various pesticides in one treatment against some pests would be practical. The schedule of protection of potato fields is prepared according to appearance of aphids. It was found that in years with early and warm springs aphids appear earlier than hatching of L. decemlineata eggs, and therefore 1st and in many cases 2nd treatment against aphids cannot be complex because there are no larvae of L. decemlineata in potato fields. First symptoms of Irish blight are observed much later. In years with a late and cold spring appearance of aphids is delayed and coincides with the hatching of L. decemlineata eggs. In such cases, in some areas of Poland, 1st treatment, and 2nd treatment areas, may be effective against L. decemlineata and aphids. In some cases in 2nd treatment fungicides against Irish blight may be included.

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