سمیت چندحشره کش گیاهی روی شته سیاه مرکبات Toxoptera auranti(Hemiptera: Aphididae)در شرایط آزمایشگاهی

The black citrus aphid, Toxoptera auranti (Hemiptera: Aphididae) is one of the sucking pests of tea plant in the north of Iran which reduces the plant yield by sucking the sap of young leaves. Use of chemical pesticides to pests control in the tea gardens is not allowed due to the organic nature of the Iranian tea product. In this research, toxicitiy of Matrin® (Sophora flavescens extract), Tondexir® (pepper extract), Palizin® (Eucalyptus extract), Neem Azal®-T/S (Azadirachta Indica extract, Contain 1% Azadirachtin A) and Psyla® (Foeniculum vulgare extract) were investigated on nymphs and adults of T.auranti. The experiments were performed at 25±2º C, 60±10% relative humidity and 16:8 (L:D) by leaf dipping method. Mortality was recorded 12, 24 and 48 hoursafter treatments. LC50values of Matrin®, Tondexir®, Psyla®, Neem Azal®- T/S and Palizin® on adult aphids was estimatedas 1810.7, 1432.4, 3327.2, 5187.5 and 6394.8 mg/L. Also, LC50 of these compounds on third instar nymphs was calculated as 1286.5, 901.6, 2224.1, 6301.6 and 7440.4 mg/L, respectively. The highest mortalities were detected 48 hours after treatments by Tondexir®, Matrin® and Psyla®, respectively. Sensitivity of nymphs to these compounds were higher than adults. Results show that Tondexir®, Matrin® and Psyla® are suitable for control of this pest in integrated pest management of tea garden.