Document Type : Original research paper
Authors
Plant Protection Dept. Faculty of Agriculture, Tanta University, Tanta Egypt
Abstract
Abstract:
The sugar beet fields have several insect predators that should be conserved to keep the natural balance in the fields. In current study the efficiency of certain insecticides on Spodoptera Spp., associated predators and Suger beet productivity. Results indicate that ecdysone agonists are efficient in controlling sugar beet insects; Spodoptera Spp. At the same time, these insecticides are safe to predators in comparison with conventional ones. Over all mean of reduction in Spodoptera Spp. Numbers due to ecdysone agonists (Raner, Abhold, Xtreme, Methobiet and Ferto) were 77.70, 79.13, 77.23, 80.50 and 78.58%, respectively Whereas, conventional insecticides (Dora, Marshal, Fartyplus, Diracomel and Pleo) were 78.51 , 78.03, 77.70, 78.33 and 79.41%, respectively. In such concern predators, ecdysone agonists were induced reduction in predator numbers with 24.78, 25.83, 24.28, 25.94 and 24.52%, respectively While, conventional insecticides caused reduction with 99.05, 100, 100, 98.68 and 100%, respectively. Also, show that highly differences among the plots sprayed with ecdysone agonists and conventional insecticides and untreated plots (control) in Root and sugar yield during the two seasons. Concerning, Spodoptera Spp. root and sugar yield were 9.976 and 1.407, respectively in control plots. Whereas the values were 22.047, 22.023, 22.047, 22.00, 22.047, 22.071, 22.047, 22.00, 22.047 and 22.095 for root yield in plots treated with insecticides. While, sugar yield was 3.750, 3.790, 3.820, 3.790, 3.858, 3.752, 3.926, 3.742, 3.822 and 3.890 for plots treated with insecticides.
Keywords
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