The Distribution and Identification of Crassocephlum crepidioides Benth Resistan to Paraquat at Coirn field (Zea mays) in Dairi District
| Main Authors: | Sianturi, Berton; Politerknik Mandiri Bina prestasi Medan, Lisnawita, Lisnawita; University of Sumatera Utara, Purba, Edison; University of Sumatera Utara |
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| Format: | Article info application/pdf eJournal |
| Bahasa: | eng |
| Terbitan: |
Pasca Sarjana FP USU
, 2017
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| Subjects: | |
| Online Access: |
https://jurnal.usu.ac.id/index.php/tropik/article/view/18038 https://jurnal.usu.ac.id/index.php/tropik/article/view/18038/8083 |
Daftar Isi:
- Crassocephalum crepidioides on Corn fields in Dairi Regency had been reported to become more difficult to control using paraquat. The objective of the research was to determine the characteristics and the distribution of C.crepidioides resistant to paraquat in corn fields. The experiment was carried out in two steps, the first step was screening the population of C. crepidioides with paraquat at recommended dose, and the second step, dose response experiment for the resistance level of C. crepidioides population with dose 0, 76, 152, 304,5, 609, 1218, and 2436 g.ai /ha. In the first step experiment, paraquat dichloride was applied at 280 g.ai/ha. The treatments were arranged in randomized block design with 3 replication. The second step experiment was that the resistant populations confirmed in the first experiment were sprayed for their dose response. The treatments were arranged in a randomized complete block design (CRBD). The results showed that of 30 populations of C. crepidiodes, 19 populations (63.3%) were categorized to be resistant with the mortality ranging from 10.84% to 52.08%, and 11 populations (36.7%), was categorized as highly resistance with mortality of 0% to 9.21%. The level of resistance (R/S) of R-C25, R-C27, and R-C30 populations of C. crepidioides were 12,3, 14,86, and 24,83 times consecutively, compared with the susceptible population. The number of C. crepidioides chlorophyl leaves in susceptible population was significantly lower that of resistant population.