Toxicity and persistence of Spinosad super( registered ) (Conserve 0.024% and Tracer 24%) to Zizyphus fruit fly, Carpomyia incompleta Becker (Diptera: Tephritidae), under laboratory conditions

• Published in: Archiv für Phytopathologie und Pflanzenschutz 2014-08, Vol.47 (14), p.1666-1674
• Main Authors: Rizk, Moustafa MA, Temerak, Sobhy AH, Abdel-Galil, Farouk A, Darwish, Dalia YA
• Format: Article
• Language: English
• Subjects: Diptera; Tephritidae
• ISSN: 0323-5408; 1477-2906
• DOI: 10.1080/03235408.2013.853914

Two forms of the insecticide (Spinosad super( registered )) are recommended by the Egyptian Ministry of Agriculture and Reclaimed Areas for the control of the fruit flies. One form is for partial spray on fruit trees and one form is for soil treatment. (a) Conserve 0.024% application: statistical analysis indicated that the toxicity regression line had a linear order with a coefficient of determination R super(2) = 0.779. The LC sub(50) was determined by both mathematically and from the illustrated line as 95.17 ppm. Persistent regression line was of the first-order line with regression coefficient of -16, simple correlation of 0.977 and coefficient of determination of 0.9552. The T sub(50) was found to be 2.2 days. (b) Tracer 24% application: toxicity regression line has a linear order; the simple correlation was found to be 0.819; and the coefficient of determination (R super(2)) was found to be 0.6712. The LC50 was determined by both mathematically and from the illustrated line as 15.5 ppm. Spinosad has a different mode of action from other pesticides and is most effective when applied in planned programmes with other insecticides of different mode of action. Moreover, users must avoid the use of same active ingredient or mode of action on consecutive generations of insect. However, repeated applications to control a single generation are acceptable. Thus, we strongly recommend applying Spinosad as a soil application to control the last generation of the summer season.