Population reduction of Florida wax scale in citrus using potassium nitrate and surfactant.

Citrus, Foliar Spraying, Israel, KNO3, Orange,

The purpose of the study was to test the control of Florida wax scale (FWS) in citrus using potassium nitrate in comparison with broad-spectrum insecticides. The trial included the following treatments: organophosphates (13 l in 3,500 l of water/ha), _KNO3 (4%) + surfactant (Triton B-1956) 0.05% sprayed in 3,500 l/ha and the control. These treatments were conducted in a 34 ha, 20-year-old citrus orchard in the southern coastal plain of Israel. The ECF control by potassium nitrate + surfactant was almost as good as organophosphorus pesticides and statistically significantly better than the untreated control (Figure 1). In addition, in a citrus orchard in Yesodot (southern coastal plain) in Israel, population reduction of the invasive generation of ECF larvae at low population density was achieved by combining a nutritional spray of 4% potassium nitrate with 2% oil spray once a year, thus obviating the need for pest control by any other procedures for 7 years.

Effect of treatments on the average number of live Florida wax scales per shoot (root-transformed values) in days before spraying.

Author

Yardeni, A., E. Shapira, K. Ascher and Y. Ben-Dov. 1995. Thinning populations of the Florida wax scale, Ceroplastes floridensis Comstock (Coccidae), by use of potassium nitrate and spray oil, as an option in IPM of citrus groves in Israel. Israel Journal of Entomology, 29: 271-276.

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