Potential Endophytic Indigenous Bacteria as Resistant Inducing Shallot Plant in Controlling Spodoptera Exigua Pests (Lepidoptera: Noctuidae)

Shallots (Allium ascalonicum L.) are vegetable commodity that have high economic value and are included in important commodity in Indonesia. The research conducted at Agricultural Biological Control Laboratory and in Solok District. The authors had obtained five endophytic bacterial isolates, which have the ability to impact on systemic shallot plant resistance. One of the mechanisms in plant resistance resilience is the change in salicylic acid content. The purpose of this study were to calculate the salicylic acid content of shallots plants introduced by endophytic bacteria isolate and able to affect its resistance to S.exigua. This research was conducted by introducing six isolates of endophytic bacteria on shallots tubers and planted in Lipek Pageh village, Solok district. Then the shallots crop were allowed to infected Spodoptera exigua naturally on endemic onion crops Spodoptera exigua. The study was arranged in a randomized block design (RAK) with 5 treatments and 4 replications. The treatments were B10³4, B10?1, U10?3, U10³1, A10³4. Analysis of salicylic acid content was done on the roots of shallot plants. Extraction and quantification of salicylic acid was done by Rasmussen et al. (1991) modified. The results showed that endophytic bacteria was able to stimulate the occurrence of resistance to onion plant cultivation of S. exigua. This is indicated by the decrease of S. exigua attack rate