Malays. Appl. Biol. (2005) 34(2): 43–49
PARAQUAT AND GLYPHOSATE RESISTANCE IN WOODY BORRERIA (HEDYOTIS VERTICILLATA) GROWING AT OIL PALM PLANTATIONS IN TERENGGANU, MALAYSIA
CHUAH, T.S.1, NOOR-ZALILA, M.R.2, CHA, T.S.2 and ISMAIL, B.S.3*
1 Faculty of Agrotechnology and Food Science, 2 Faculty of Science and Technology, Kolej Universiti Sains dan Teknologi Malaysia, Mengabang Telipot (KUSTEM), 21030, Kuala Terengganu, Terengganu, Malaysia
3 School of Environmental and Natural Resource Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, 43600 UKM Bangi, Selangor, Malaysia
ABSTRACT
Glyphosate- and paraquat-resistant and susceptible biotypes of Hedyotis verticillata (woody borreria) infesting oil palm plantations of Terengganu, Malaysia, belonging to the Federal Land Consolidation and Rehabilitation Authority (FELCRA), Bukit Sudu, FELCRA Bukit Kapah, and the Federal Land Development Authority (FELDA), Belara, Kuala Terengganu were screened in a greenhouse study. Dose-response tests conducted using 3- to 4-leaf plants revealed that H. verticillata from oil palm plantations of FELCRA Bukit Kapah and FELDA Belara have developed multiple-resistance towards both glyphosate and paraquat. The paraquat resistance biotype of H. verticillata was detected in oil palm plantations of FELCRA Bukit Sudu. Comparison of concentrations of herbicides required to kill 50% (ED50 value) of the population indicated that the resistant biotypes of H. verticillata are between 2 to 4- fold more resistant than their respective susceptible biotypes.
ABSTRAK
Penyaringan ke atas biotip rintang dan rentan Hedyotis verticillata terhadap glifosat dan parakuat yang tumbuh di ladang kelapa sawit FELCRA Bukit Sudu, FELCRA Bukit Kapah dan FELDA Belara, Terengganu, Malaysia telah dijalankan di rumah kaca. Ujian gerak balas dos yang menggunakan tumbuhan pada peringkat 3-4 helai daun menunjukkan H. verticillata dari ladang kelapa sawit FELCRA Bukit Kapah dan FELDA Belara adalah rintang terhadap kedua-dua glifosat dan parakuat. Biotip H. verticillata yang rintang terhadap parakuat dikesan di ladang kelapa sawit FELCRA Bukit Sudu. Perbandingan antara kadar racun herba yang diperlukan untuk mematikan 50% daripada populasi (ED50) menunjukkan biotip rintang adalah di antara 2 – 4 kali ganda lebih rintang berbanding dengan biotip rentan masing-masing.
Key words: Hedyotis verticillata, multiple-herbicide resistance, ED50, dose-response
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