THE SPECIES OF INSECTS AND THEIR ROLES FOR SWEET POTATO PLANTS (IPOMOEA BATATAS L.)
This study aims to identify the types of pest and non-pest insects in sweet potato plants, and to know their index of diversity. The observation result obtained 10 species of pest insects are classified into six orders. Four families in Diptera, two families (Dolichopodidae and Syrphidae) as predators while the other two families such as Tipulidae and Neridae are unidentified. Order of Coleoptera: Coccinelidae family (Coccinela sp) and Carabidae are as predators, while Scarabaeidae role is unidentified. There is only Reduviidae family in Hemiptera Order. Population and most insects species found in Order Hymenoptera. Formicidae family as predators and as parasites from family ichneumonidae, Megaspilidae, Braconidae, Eupelmidae, and Encyrtidae. Another family of Forficulidae role in the Order of Dermaptera is unidentified.
The research result shows that the diversity index of insects in sweet potato plants varied in each location. The highest diversity index to lowest are 2.541 in Location I; 2,473 in Location II; 2,331 in location V; 1,115 in Location IV and 0.979 in Location I, consecutively. Based on Odum’s criteria (1993), all locations are classified into medium to good in which the natural enemies and pests are in equal position, except location I.