Studies related to the Biology of the brown tussock moth, Olene mendosa Hübner in Kerala, especially in Northern Kerala is scanty. There were no comparative biology studies of Olene mendosa on different crops in Kerala. The present studies were undertaken during 2018-19, under room temperature (28-340C). The data on comparative biology of Olene mendosa on different hosts inferred that Female lays around 212-214 eggs in Solanum melongena. While minimum numbers of eggs were recorded from Abelmoschus esculentus (210-215). Larvae develop through five instars in 57 to 60 days with an average of 58.5 days at 28-32 °C. The present studies, the comparative biology of Olene mendosa is important for to know the best host that support the development of Olene mendosa and can be used for mass rearing. Similarly, the information of life history parameters of Olene mendosa on different host plant species will help to make efficient strategies to control this economic pest.