This study thus evaluates seven components – four essential oils extracted with alcohol, n-hexane
(CH3(CH2)4CH3), acetone (CH3COCH) and dichloromethane (CH2Cl2) respectively, an artificial
pandan flavouring (Star Brand), an aqueous crude extract and an aromatic compound, 2-acetyl-
1-pyrroline (2AP) (C6H9NO) - from P. amaryllifolius as repellents against German cockroaches,
Blattella germanica (L.).