101 J-PAL, Vol. 10, No. 2, 2019 ISSN: 2087-3522 DOI: 10.21776/ub.jpal.2019.010.02.03 E-ISSN: 2338-1671 The Difference of Arthropods Diversity in Semi-Organic and Conventional Citrus Orchard in Dau, Malang Galih El FIkri 1 , Bagyo Yanuwiadi 2 , Aminudin Affandi 3 1 Master Program of Enviromental Management, University of Brawijaya 2 Biology Departement, Faculty Mathematics and Natural Science, University of Brawijaya 3 Pest and Plant Disease Faculty of Agriculture University of Brawijaya Abstract The purpose of this research is found diversity of arthropods in citrus orchard to describe effect of pestide. Therefore, the researchers are interested in conducting a study of which is to describe and compare the numbers and types of insects in organic and semi-organic citrus orchard. This study has been done on 4 conventional and 2 semi-organic orchard in Dau, Malang, in February 2019. Arthropod observation using pitfalltraps and visual encounter method. Pitfall trap were performed on 5 point in each orchard. The visual encounter method was conducted for 1 hour in on each orchard. The findings show that there are 1,365 insects which belongs to 10 orders and 21 families. The number of arthropod between the two locations was indicated by the number of different type of arthropods. In the semi-organic orchard, there are 960 Species from 13 families, and conventional there are 405 species from 13 families. The dominant family from Drosopilidae, Formicidae, Chrysomelidae, Lycisidae, Anisolabididae and Aphididae. Conventional orchard system considered as stable environment which is an average of 2.8 of diversity index. The highest number of species belonging to pests reaches 61%. Keyword: Arthropod, Citrus orchard, Conventional, Diversity, Semi-organic  INTRODUCTION The green revolution in 1960 cause impact of the ecosystem has begun. Green revolution is to increase agricultural productivity. The way is using inorganic ingredients such as pesticide and fertilizer. The impact in ecosystem of the use of inorganic materials is pollution of the environment both soil, water and air as well as pest explosions so that inevitably farmers must continue to use pesticides. Conventional systems are implemented to prioritize crop production. So that in processing it Chemical are used from industrial products such as chemical fertilizers with high active ingredients, herbicides, and pesticides. The main purpose is to produce higher yields or crops because of the loss of plant pest organisms [1]. Conventional systems certainly have a negative impact, for the change in ecosystem stability because it uses synthetic chemicals. The most obvious impact is on the health aspect such us product health and ecosystem health [1] Government have been make serious effort to replace organic fertilizers and pesticides and implement the Integrated Management of Correspondence address: Galih EL Fikri Email : galihelfikri@gmail.com Address : Master’s Program in Environmental Resources Management and Development, Postgraduate, Universitas Brawijaya, Malang Healthy Citrus orchards. These efforts have not been maximally implemented by farmers because the prices of organic agricultural products on the market are competitive. The encouragement from the farmers and the government is considered to be not optimal to truly implement organic farming in Indonesia. Insect soil have a vital role in the food chain, especially as decomposers. Without the insect, natural organisms will not be able to recycle organic materials. Arthropods also play a role as prey for other smaller predators, so it will sustain other arthropods. As a consequence of arthropod community structure will reflect the environmental factors that affect the soil, including on human activity. The identification of the abundance and diversity of birds and arthropods species is important, so we can know the role of the organism to the environment [2]. This research purpose is to detetmine diversity of insects in citrus orchard to describe the effect of pestide. Arthropod diversity describes the level of demage in the orchard. The level of demage is a reference to improve land and for determing strategy for the conversion process of organic