Efficacy of Red Betel Leaf's (Piper crocatum) Chloroform Extract as Repellent against Rice Bugs Leptocorisa acuta Thunberg, 1783 (Hemiptera: Alydidae)

Rice bugs Leptocorisa acuta is one of the insects that can damage and reduce rice production by sucking the sap inside the rice grains during the milky phase. The usage of red betel leaf's (Piper crocatum) extract as bio repellent is one of the alternatives to reduce rice bug's pest without causing any environmental degradation. This research aims to compare and determine the most effective concentration level of red betel leaf's chloroform extract as a repellent. The red betel leaf extract was tested at concentrations 25, 37,5, and 50. The methods in this research included sampling and acclimatization of rice bugs and repellency test of rice bugs using various concentrations of the extract. The study results were analysed using Probit Analysis with Lethal Concentration (LC50) according to the number of rice bug's repellency. The results showed that at 59.75 concentration of red betel leaf extract's chloroform effectively repelled 50 of the rice bug's population and reduced the number of rice bugs population below the economic threshold level.