| Popis: |
The effect of water extracts of six plants as a toxic activity on Spodoptera littoralis 2'4 & 4°5 larvae was investigated under controlled laboratory condition of 27 °C and 55 — 65% R.H. These plants were leaves of Dodonaea, Dodonaea viscoza, (family: Sapindaceae), pulps and seeds of sour orange Citrus aurantium v. 81778M (family: Rutaceae), (midrib of cabbage leaf), Biassica oleracea v. capitata, (family: Crudferae), (turnip), Brassica raga v. esculenta (family: Crudferae) and (Mango-singara) MangAva domestics (family: Anacardiaceae). Data obtained revealed that Dodonaea-water extract and pulp of sour orange water-extract caused the highest mortality and reduction percentages (80 & 75% than control in 2°I instar larvae and 80 & 81.3% than control in 4m instar larvae, respectively). In addition, pulp of sour orange extract manifested effects since it caused shorter mean of larval duration (13.5 days), longer mean of pupal duration (15 days) and lowest mean of pupal weight (0.1485 gm). Meanwhile, shorter mean of adult longevity (4.3 days) was due to Dodonaea leaves extract. Bioassay data were observable in which the shortest LTso values (4.46 and 3.59 days) for 2"`f and 4m instars larvae treated with Dodonaea extract at 10% concentration, respectively. |
