Evaluation of various methods on control of olive sucker growth
2004
Nazer Kakhaki, Seiied Hosein | Azimi, Mohammad | Zinanloo, Ali Asghar
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. A experiment, starting in the spring of 1999, was carried out to compare several methods of sucker control in Motahari orchard for 4 years in Olive Research Station, Tarom of Zanjan Province, Iran. The experiment was in the framework of Randomized Complete Block Design with 3 replications and the following treatments: Manual removal of suckers in April, Manual removal of suckers in April, June, and Augustspraying with 6 l/ha of glyphosate (41% SL) + 1.5 l/ha emulsifier (Citowett)spraying with 8 l/ha glyphosatespraying 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 (no removal of suckers). Data collection included number and length of sucker, wet and dry weight of sucker, number and height of newly developed shoots, wet weight of 50 fruits, fruit ratio of flesh to kernel and oil percent extracted. Results showed that 2,4-D + MCPA, glyphosate, and glyphosate + Citowett effectively reduce 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 between treatments in the number or growth rate of newly developed shoots. On the other hand, 3 times removal of suckers, 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 were suggested for olive sucker control.
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