Context: Repellency test can play an important role in special environmental conditions. Objectives: The main objective of this study was to make a standard protocol to control the pest by screening the test materials using adult beetles by repellency test to see whether or not the extracts contain any potential to repel the stored grain pest. Materials and Methods:The experiment was conducted in choice chamber, which was divided by half filter paper discs (Whatman No. 40, diameter 9 cm). One half of the filter paper was loaded with untreated (control) and the other half was loaded with the extract of A. augusta. All the CHCl3 extracts were separately applied onto each of the half-discs and allowed to dry out in the air for 10 mins. Each treated half-disc was then attached lengthwise, edge-to-edge, to a control half-disc with adhesive tape and placed in petri dishes. The orientation of the same was changed in the replicates to avoid the effects of any external directional stimulus affecting the distribution of the test insects Tribolium castaneum (Herbst). Ten adult insects were released in the middle of each of the filter-paper circles and each test was replicated five times. Results: All the test extracts of seed, leaves, root wood, stem bark and stem wood of A. augusta collected in chloroform showed repellent activity against adult beetles of T. castaneum at dose levels of 314.540, 157.270, 78.635, 39.318, 19.659 and, 9.831 µg/cm 2 on filter paper. According to the intensity of repellency the results could be arranged in the order: stem bark >seed> root wood > leaf > stem wood and in all the cases significant differences were obtained. Conclusion:The present results revealed that A. augusta extracts can be used as a reduced risk repellent compound in the grain and cereal stores to manage the population of T. castaneum. The results also seen to be encouraging when there is a greater need for environment-friendly pesticides then ever before.

The chloroform and methanol extracts of the leaves, root wood, stem bark, stem wood and seeds of Abroma augusta (L.) (Ulatkambal) were tested against Tribolium castaneum (Herbst) adults through residual film assay. The seed extracts (CHcl3 and MeOH) were found to offer the highest mortality of the beetles and the LD50 values were 3046.083, 247.9217 and 75.96001 ?g/cm2 and 6598.793, 340.4855 and 113.6461 ?g/cm2 for the (CHCl350 values of 1127.785, 312.5822 and 146.3708 ?g/cm2 and 1689.468, 449.8259 and 134.9692 ?g/cm2 for the (CHCl3350 values of 3466.807, 450.3049 and 175.7438 ?g/cm2 and 4654.238, 1010.538 and 333.7202 ?g/cm2 for the(CHCl3350 values of 3295.859, 1137.558 and 363.1539 ?g/cm2 and 3717.851, 566.2215 and 230.7044 ?g/cm2 for the (CHCl33A. augusta did not show any activity against the beetles. According to the intensity of activity observed through mortality of the adult beetles the potentiality of the chloroform extracts could be arranged in a descending order of seeds> root wood > leaf> stem bark and for the methanol extracts, seed>root wood > stem bark > leaf. DOI: http://dx.doi.org/10.3329/jles.v8i0.20134 J. Life Earth Sci., Vol. 8: 11-15, 2013