Plant-disturbing organisms are an integral component of the ecosystem in agricultural cultivation, so research on knowledge of attitudes and actions in managing plant-disturbing organisms needs to be known as information for integrated pest management in order to support sustainable cassava production. The study aims to obtain information about the knowledge, attitudes, and actions of farmers in the management of pests and diseases of cassava plants in Tanjungsari District, Gunungkidul Regency, Yogyakarta. The study was conducted in 5 villages namely, Kemadang, Kemiri, Banjarejo, Hargosari and Ngestirejo villages. There were 50 farmers who became respondents, with a distribution of 10 farmers per village. The study was conducted by survey using a structured questionnaire to determine the characteristics and attitudes, knowledge, and actions of farmers. The relationship between farmer characteristics and farmers' knowledge, attitudes and actions was analyzed using the χ2 (Chi-Square) test. The results showed that respondent farmers in Tanjungsari Subdistrict generally had knowledge of cultivation methods from the experience of other farmers. The main pest that attacks is mealy bug, while the main disease is the basal stem rot. Most of the respondent farmers do not control pests and diseases. Analysis of the relationship between age, education, farming experience, and farmer group membership, shows that there is no correlation between these parameters with farmer knowledge. However, farmer's attitude correlates with education level. Whereas farmers actions correlate with age and farmer group membership.