Oriental fruit moth, Grapholita molesta (Busck) (Lepidoptera: Tortricidae), is an important pest for both stone and pomefruits. In a previous study, we selected four best plant extracts [Nicotiana tabacum L., Allium sativum L., Zanthoxylumpiperitum (L.) DC., and Sapindus mukorossi Gaertn.] against first instar larva, and here we evaluated them against adultstage (<5 d old) in laboratory. N. tabacum applied at 2 mg/ml showed highest corrected mortality of 85 and 100% infemale and male, respectively, within 168 h of exposure. Combined spray of N. tabacum and A. sativum showed LT50of 103.5 and 63.9 h on female and male, respectively. We also evaluated the deterrent effect of the plant extracts onovipositioning, and found that female laid less egg (29) on N. tabacum treated twigs at the concentration of 4 mg/twig.Thus N. tabacum can be a potential botanical insecticide against G. molesta.

Oriental fruit moth Grapholita molesta (Busck) (Lepidoptera: Tortricidae) is an important pest for stone fruits like apple, peach, pear etc. Growers usually depend on chemical insecticides to control this pest, but it causes problems like resistance, pest resurgence, and health hazard. Although various plant extracts have been known to be potential against other lepidopterans, their effectiveness against oriental fruit moth has rarely been studied. So, we evaluated toxicity of 28 methanolic plant extracts known from previous literatures in the laboratory condition. Residual toxicity against 1st instar larvae (<5 h old) were examined using glass scintillation vial method at the concentration of 2 mg/ml. Among the tested botanicals Nicotiana tabacum L. was most effective and showed 92% mortality within 20 h and LT50 value was 12.9 h followed by Allium sativum L., Zanthoxylum piperitum (L.), and Sapindus mukorossi Gaerten. which showed 88, 70, and 65% mortality within 20 h, respectively. Rhododendron micranthum Turcz., Humulus japonicus Seibold & Zucc., Nerium indicum Mill., and other extracts showed least effectiveness on 1st instar larvae of oriental fruit moth. Hence, we suggest N. tabacum, A. sativum, Z. piperitum, and S, mukorossi as botanicals to be used against oriental fruit moth.