Evaluation Of Various Methods On Control Of Zard Olive (Olea Europaea L.) Cultivar Sucker
2007
Nazer Kakhki, S.H., Zanjan Agricultural and Natrual Resources Research Center, Zanjan, Iran | Azimi, M., Zanjan Agricultural and Natrual Resources Research Center, Zanjan, Iran | Rahimian, H., Faculty of Agriculture, Tehran University, Karaj, Iran
Suckers in olive trees act as a sink and compete with fruit for water and nutrients. Thus, suckers may be considered as weeds in olive orchards. An experiment, starting in the Spring of 1999, was carried out to compare several methods of sucker control at motahari orchard for 4 years in Tarom, Zanjan Province, Iran. The experiment was conducted in a RCBD layout with 3 replications and the following treatments: Manual removal of suckers in April; Manual removal of suckers in April; June and August; spraying with 6 l/ha of glyphosate (41% SL) + 1.5 l/ha emulsifier (Citowett); spraying with 8 l/ha glyphosate; spraying with 2.5 l/ha bromoxynil (22.5% SL); spraying with 2 l/ha of 2,4-D + MCPA (67.5% SL); spraying with 3 l/ha of paraquat (20% SL); and check with no removal of suckers. Data collection included number and length of sucker, fresh and dry weight of sucker, number and height. Data were collected in the newly developed shoots, fresh weight of 50 fruits, flesh to stone fruit and extracted oil percentage. Results showed that 2,4-D + MCPA, glyphosate, and glyphosate + Citowett effectively reduced sucker number. 2,4-D + MCPA, glyphosate, and 3 times manual removal of suckers reduced wet and dry weight of suckers. There was no significant difference among the treatments in the number or growth rate of newly developed shoots. On the other hand, 3 times removal of suckers, aplication of Glyphosate, Glyphosate + Citowett, or Paraquat, increased growth rate of newly developed shoots. The treatments had no significant effect on fruit parameters measured, especially yield and oil percent extracted. According to results, 2,4-D + MCPA, glyphosate and glyphosate + Citowett should be recommended for olive sucker control.
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