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The results of the experiments on the control of cherry fruit fly with usual spraying and mist-spraying



The results of the experiments on the control of cherry fruit fly with usual spraying and mist-spraying



Prace Inst Sadownictwa W Skierniewicach 5: 177-184



The effectiveness of 3 treatments was compared (1) spraying with Azotox at 0.1% concentration of techinical DDT 10 days after the flight of first flies, (2) aerosol application with Duotex-Nebelmittel (30% DDT and 3% lindane) using 6[long dash]7 1/ha, conducted 10 days after the flight of first flies, and (3) spraying with the mixture of Azotox (0.1% technical DDT) with Dipterex (0.1%) 7 days later, on the third day egg laying. All 3 treatments decreased the number of infested fruit to about 1%. Aerosol application permits the protective treatment to be done during shorter time in more orchards, and needs no diluting of compounds with water, an important consideration in controlling cherry fruit fly in large areas. Third treatment at a later date is less desirable because of the danger of residue on the fruits during harvest. Better results obtained in 1959 than in 1957 (Leski et al., 1959), were due to the experiments carried out on large at least one ha plots, whereas in 1957 one plot consisted of only a few trees. This indicates that in the case of Rhagoletis and other mobile pests it is better to set up the experiments on large-sized plots. Lower effectiveness of Azotox spray in Rembertow could be explained by the slightly depressed site of the orchard, inclined to the north, whereas the other orchards were situated a little higher on the plain. Because of this the flight of cherry fruit flies began a little later in this orchard, and the date recommended for spraying was too early. This indicates the importance of accurate timing.

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