Browsing by Author "Larsen, Thomas Everett"
Now showing 1 - 2 of 2
- Results Per Page
- Sort Options
Item The deposition and retention of a microencapsulated oriental fruit moth pheromone applied as an ultra-low volume spray in the canopy of three peach cultivars(Alma Mater Studiorum, 2009-06) Larsen, Thomas Everett; Kovancı, Orkun Barış; Gençer, Nimet Sema; Uludağ Üniversitesi/Ziraat Fakültesi/Bitki Koruma Bölümü.; AAH-2039-2021; 12759314200; 8863967900Microencapsulated oriental fruit moth pheromone (Checkmate OFM-F) was applied using airblast sprayers at a rate of 15 g a.i./ha either in 635 or 40 litres of water/ha for high-volume and ultra-low volume (ULV) application, respectively. Trials were conducted in peach orchards composed of "Dixired", "Redhaven" and "Glohaven" cultivars in northwestern Turkey in 2006 and 2007. Male moth catches were significantly higher in the insecticide control plots (mean 5.58/week) than those in both high volume (3.38/week) and ULV (1.40/week) pheromone treatments. The ULV application deposited 1.6 times greater number of microcapsules per cm(2) leaf and fruit than the high-volume application. Significantly more microcapsules per cm(2) were deposited on peach leaves (0.06 +/- 0.003) than fruits (0.03 +/- 0.002). "Dixired" leaves and fruits retained significantly more microcapsules per cm(2) than "Redhaven" and "Glohaven" leaves and fruits. The relatively open canopy of "Dixired" may have allowed the accumulation of more pheromone microcapsules around midrib of curved leaves. The differences in microcapsule density did not significantly differ between upper and lower surfaces of peach leaves but leaves in the upper tree canopy had significantly more microcapsules per cm(2) than those in the lower canopy. Unlike leaves, neither fruit surface nor canopy height had any significant effect on the microcapsule deposition on fruits of any cultivar.Item High versus ultra-low volume spraying of a microencapsulated pheromone formulation for codling moth control in two apple cultivars(Taylor & Francis, 2010) Larsen, Thomas Everett; Kovancı, Orkun Barış; Kumral, Nabi Alper; Uludağ Üniversitesi/Ziraat Fakültesi/Bitki Koruma Bölümü.; 0000-0001-9442-483X; AAH-2039-2021; A-1388-2019; 12759314200; 15846048400Mating disruption is the controlled release of sufficiently large quantities of insect sex pheromones into the air, using pheromone dispensers, so as to disrupt the ability of males to locate and mate with females. Current microencapsulated sprayable pheromone formulations for codling moth have limited residual activity, but applying sufficient amount of microcapsules in the canopy can enhance their disruption efficacy. For this purpose, the effect of spray volume and apple cultivar on the number of pheromone microcapsules was studied in 2006 and 2007. Sprayable pheromone was applied at a rate of 25g a.i./ha either in high-volume (768l water/ha) or ultra-low volume (24l water/ha) sprays with an airblast sprayer. The low-volume application deposited significantly more microcapsules per cm2 leaf, which was particularly evident in the upper tree canopy and on the undersides of the leaves. Microcapsule retention also significantly differed between 'Fuji' and 'Granny Smith' fruits treated with low-volume application. Our results suggest that spray volume and pressure reductions can increase the number of microcapsules deposited on leaves and fruits. Varying the leaf and fruit retention characteristics of cultivars may also influence the use of sprayable pheromones in mixed cultivar orchards.