~ 159 ~ Journal of Entomology and Zoology Studies 2017; 5(3): 159-162 E-ISSN: 2320-7078 P-ISSN: 2349-6800 JEZS 2017; 5(3): 159-162 © 2017 JEZS Received: 21-03-2017 Accepted: 22-04-2017 B Chiranjeevi Department of Entomology, Sri Krishnadevaraya College of Agricultural Sciences, Anantapur-515001 (ANGRAU, Bapatla), Andhra Pradesh, India. SV Sarnaik PG Entomology Student, Department of Entomology, College of Agriculture, Badnapur-431202 (VNMKV, Parbhani), Maharashtra, India Correspondence B Chiranjeevi Department of Entomology, Sri Krishnadevaraya College of Agricultural Sciences, Anantapur-515001 (ANGRAU, Bapatla), Andhra Pradesh, India. Bioefficacy of promising insecticides against maggot population of pigeonpea pod fly, Melanagromyza obtusa (Malloch) B Chiranjeevi and SV Sarnaik Abstract The present studies revealed the treatment with chlorantriniliprole 18.5 SC @ 30 g a.i. per ha was found best with minimum maggot population of M. obtusa at first and second spray i.e. 34.33, 16.33, 11.67, 10.67 and 18.00; and 30.33, 34.33, 12.00, 9.33 and 19.33 maggots per 100 pods on one, three, seven, ten and fourteen days after first and second spray and it was followed by neem oil @ 3%. The least effective treatment was Eucalyptus oil @ 5% with maximum population at first and second spray i.e. 44.67, 42.67, 38.67, 39.33 and 46.33; and 40.33, 44.67, 38.00, 35.00 and 46.00 pod fly maggots per 100 pods at one, three, seven, ten and fourteen days after first and second spray. The result revealed that chlorantriniliprole 18.5 SC @ 30 g a.i. per ha was found best treatment in respect of minimum maggot population after the both insecticidal spray. Keywords: Bioefficacy, Insecticides, Maggots, Melanagromyza obtusa, Pigeonpea and Pod fly Introduction Pigeonpea [Cajanus cajan (L.) Millsp.] is the second important pulse crop grown in India and commonly known as red gram or tur or arhar [1, 2] . Pigeonpea is one of the most important pulse crop, widely grown by small farmers in the semi-arid tropics as a backyard subsistence crop being cultivated in more than 25 countries of the world [3] . More than 300 species of insect species have been reported infesting pigeonpea crop [4] of which pod fly, Melanagromyza obtusa (Malloch) is of regular occurrence, causing 10-80% damage [5, 6] and estimated to cause a loss of US$ 256 million annually [7] . The pod fly lays eggs in immature pods and feeds on developing seeds. The infested immature pods do not show external evidence of damage until the fully grown larvae chew exit holes in the pod walls [8] . Till date, chemicals are the only available efficient strategy against M. obtusa yet it involves several limitations like no promising management of the pest even after two or three applications of insecticides, the crop still undergo considerable losses and also the insecticides are mostly unsafe to natural enemies and also cause hazards to mankind. The insecticides which have ovicidal and translaminar action to create the lethal concentration in host at infestation points may be effectual. [6, 9, 10] conducted several field studies to determine the efficacy of several insecticides applied alone for the control of pod fly. However, these findings did not find acceptability and led to partial success. Insecticides that should leave lesser residues and pose lesser environmental threat have become imperative [11] . Exploring new insecticides with lesser residues, lower environmental threat, novel mode of action and more remunerative has become imperative. Keeping this in view, therefore the present studies were carried out to evaluate the bioefficacy of promising insecticides against maggot population of pigeonpea pod fly, Melanagromyza obtusa (Malloch). 2. Materials and Methods The field experiment was conducted at Research Farm, Agricultural Entomology Unit, Agricultural Research Station, Badnapur (VNMKV, Parbhani), Maharashtra, India during Kharif season of 2015-16 to determine the bioefficacy of promising insecticides against maggot population of pigeonpea pod fly, Melanagromyza obtusa (Malloch). The experiment was laid out in randomized block design (RBD) with three replications. Total 33 plots of 5.4 m X 4.8 m size were sown with 30 cm X 60 cm spacing by using Cv. BDN-711. Eleven treatments including untreated control were imposed in all three replication randomly.