Mechanism and Resistance Level of Inpari 13 to Field Populations of Brown Planthopper Collected from Klaten and Bantul

Dwi Erita, Prof. Dr. Ir. Y. Andi Trisyono, M.Sc.

2013 | Tesis | S2 Ilmu Hama Tumbuhan

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Inpari 13 was a new variety released in Indonesia with intention to control brown planthopper (BPH, Nilaparvata lugens Stal.; Hemiptera, Delphacidae). The level of resistance in Inpari 13 was evaluated by using three different BPH populations. Two populations were field populations collected from Klaten and Bantul and one was the laboratory adapted population. Factorial design was used in the research and data were analyzed with Anova and DMRT. The research consisted of two studies which used IR64 and SHS WM4 or Intani2 (hybrid varieties) as control. The first study was to know responses of two resistance varieties (Inpari 13 and IR64) toward three BPH populations. The result showed that Bantul population produced the highest BPH dry weight and number of Bantul population produced the highest BPH dry weight and number of offspring when they were fed with IR64, while the Laboratory population produced the least dry weight and number of offspring when they were fed with Inpari 13. IR64 gave higher survival of nymphs (71.3%) compared with Inpari 13 (54.0%) until 12 days after infestation. The second study was to determine the resistance mechanism of Inpari 13 against BPH. It showed that Inpari 13 significantly gave better level of resistance, lower feeding rate and less number of gravid BPH settling which eventually resulted in less eggs deposited compared with susceptible variety (SHS WM 4 or Intani 2). Those suggested that the mechanism responsible for resistance in Inpari 13 to BPH was antibiosis and antixenosis. Tolerance mechanism of Inpari 13 was not prominent and lower compared with IR64.

Kata Kunci : Inpari 13, Brown planthopper, Antibiosis, Antixenosis, Tolerance