Advance Sustainable Science, Engineering and Technology (ASSET) Vol. 3, No.2, October 2021, pp. 0210203-01 ~ 0210203-05 ISSN: 2715-4211 DOI: https://doi.org/10.26877/asset.v3i2.9660 0210203-01 Correlation of Sex Ratio and Population of Callosobruchus chinensis L. (Coleoptera: Bruchidae) in Mung Beans Gallyndra Fatkhu Dinata 1* , Baroroh Nur Jihad 2 1 Department of Plant Pest and Disease, Faculty of Agriculture, Brawijaya University, Malang, East Java, Indonesia. 2 Department of Social Economics, Faculty of Agriculture, Brawijaya University, Malang, East Java, Indonesia. *gallyndra@gmail.com Abstract. One of the important pests on mung beans is the warehouse pest Callosobruchus chinensis (Coleoptera: Bruchidae). These pests can cause yield losses of up to 90%. Populations of adult C. chinensis have a close correlation in influencing the development of this pest in mung bean storage. This study aims to determine the correlation between the sex ratio of the population and its development in C. chinensis and to see its preference for mung beans. This research was conducted at the Plant Breeding Laboratory, Brawijaya University. The method was carried out by investing adult C. chinensis in mung beans based on the sex ratio, there are four sex ratio comparisons observed. Observations were made every week to see the number of eggs, larvaes, adults and dead insects. Based on the results of the study, the sex ratio of 2 males and 3 females resulted in the highest number of populations, a total of 72 eggs and 46 adult C. chinensis. Our hypothesis is that a high sex ratio leads to an increase in the population of C. chinensis. The vima variety is resistant mung beans compared to consumption varieties because it has lower seed weight loss. The results of this study are preliminary results that can be used for further research to evaluate the correlation between sex ratio, population and development of C. chinensis. Keywords: Callosobruchus chinensis, mung beans, sex ratio, warehouse pest (Received 2021-10-06, Accepted 2021-10-26, Available Online by 2021-10-31) 1. Introduction Storage of post-harvest results is the final stage of the plant cultivation system which has the main problem of attack by warehouse pests. Warehouse pests are one of the main problems in the seed storage process. Various types of agricultural products are attacked by warehouse pests, which are mung beans (Vigna radiata). The quality of mung bean seeds must be considered to make a healthy plant. One of the things that underlie the quality of mung bean seeds is seed resistance. Each seed has a different This is an open access article under the CC BY-SA license.