The Community Structure of Parasitoid Associated with the Cassava Mealybugs on Cassava Crop in Bali Province

Parasitoid is a biological agent that can be used to control the mealybug of cassava crop. Detailed information on the community structure of parasitoid associated with the mealybug of cassava crop in Bali has not been reported. The research community structure of parasitoid associated with cassava mealybug in Bali has be done to complete this data. This study began from April to August 2019. Samples were taken from 9 districts in Bali, namely Jembrana, Tabanan, Buleleng, Badung, Denpasar, Gianyar, Bangli, Klungkung and Karangasem Regencies. In each district, 5 sample units were selected with the diagonal method and 5 crops that were infected by mealybug were selected purposely in each sample unit. Furthermore, from 5 crops, 20-35 mealybug were taken per species so that the total number of mealybug taken per species per district were 100-175 adults. The results showed that there were 3 species of parasitoids associated with mealybug Phenacoccus manihoti namely Anagyrus lopezi, Acerophagus papayae, and Blepirus insularis with the average parasitization rates of 8.7%, 1.6% and 0.5% respectively, and 2 parasitoid species associated with mealybug Paracoccus marginatus were A. lopezi and A. papayae with the average parasitization rates of 2.1% and 4.1%, respectively. The structure of P. manihoti and P. marginatus mealybug parasitoid communities in Bali showed an unstable community structure. A. lopezi and A. papayae parasitoids were found spread in all regencies in Bali, while B. insularis parasitoid was only found spread in several regencies such as Jembrana, Tabanan, Badung, Denpasar and Bangli. Keywords : Mealybug, Parasitoid, Cassava crop.