اثر چند حشره کش گیاهی روی شپشک آردآلود چای (Pseudococcus viburni (Hemiptera در شرایط آزمایشگاهی

The tea mealybug, Pseudococcus viburni (Hemiptera), is the key pests of tea garden in the north of Iran which reduces plant yields with sucking the sap of leaves. In this research, the nymphs and adults of tea mealybug were sampled in tea garden of Guilan and reared on budding potato. Toxicity of some botanical insecticides such as Matrin® (Sophora flavescens extract), Tondexir® (pepper extract), Palizin® (Eucalyptus extract), NeemAzal® T/S (Azadirachta indica extract, contain 1% azadirachtin A) and Psyla® (Foeniculum vulgare extract) were investigated on different instar nymphs of P.viburni. The experiments were performed at 25±2º C, 60±10% relative humidity and 16:8 (L:D) by leaf dipping method. Mortality was recorded after 12, 24 and 48 hours after treatments. LC50 values of Matrin®, Tondexir®, Psyla®, NeemAzal® T/S and Palizin® were calculated as 950.8, 737.2, 1051.9, 2923.6 and 1077.5 mg/L on first- instar nymph, respectively. Also, LC50 values of these compounds on second- instar nymph were estimated as 1159.9, 1518.4, 1288.4, 3241.7 and 1454.7 mg/L, respectively and LC50 values of these compounds on third- instar nymph were obtained as 2006.1, 1506.5, 2883.5, 5557.3 and 4727.3 mg/L, respectively. The results show that mortality rate increased with increasing doses and decreased with increasing nymphal age. The highest mortality obtained by Tondexir®, Matrin® and Psyla® 48 hours after treatment. Results of this research show that, Tondexir®, Matrin® and Psyla® are suitable in integrated pest management program of tea mealybug