Abstract
Cockroaches are a common and important pest that inhabits various public places such as warehouses, restaurants, etc. Essential oil from Piper nigrum was evaluated for its repellent activity against nymphs (1st, 2nd, 3rd, 4th instars) and adult German cockroaches, Blattella germanica (L.), under laboratory practical conditions. Laboratory trials were conducted using preference tests with the absence of food and the presence of food, and choice tests (control and treatment) in restaurants. The essential oil repelled both nymph and adult stages. The maximum repellencies recorded were 73.33±4.28% and 63.33±3.65% at 1 h for adults before and after food and 53.33±2.89% and 45.00±3.70% at 1 h for nymphs before and after food, respectively, in the laboratory. Whereas repellency percentages from P. nigrum were 65.19±6.90% and 55.00±8.56% at 6 h and 12 h, respectively, in kitchen experiments. Results from this study indicated that essential oil from P. nigrum could be effective to manage nymph and adult stages of German cockroaches.
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