University of Guilan Plant Pest Research 2322-2409 14 2 2024 09 22 Effect of salicylic acid application on the damage rate of the olive fruit fly Bactrocera oleae (Dip.: Tephritidae) on the olive variety Manzanilla Effect of salicylic acid application on the damage rate of the olive fruit fly Bactrocera oleae (Dip.: Tephritidae) on the olive variety Manzanilla 17 33 7972 10.22124/iprj.2024.27965.1583 FA H. Fardmasoud Department of Plant Protection, University of Mohaghegh Ardabili, Ardabil, Iran J. Razmjou Department of Plant Protection, University of Mohaghegh Ardabili, Ardabil, Iran B. Naseri Department of Plant Protection, University of Mohaghegh Ardabili, Ardabil, Iran M. Abasi Mozhdehi Plant Protection Research Department, Guilan Agricultural and Natural Resources Research and Education Center, AREEO, Rasht, Iran Journal Article 2024 07 20 The olive fruit fly, Bactrocera oleae (Dip.: Tephritidae), is an important pest affecting olive crops, leading to substantial economic losses and diminishing both the quality and quantity of olive oil production. This study investigated the effects of salicylic acid (SA) treatments at concentrations of 1 mM and 2 mM, with a control, on the Manzanilla olive variety in Rudbar Olive Research Station, Guilan Province during 2021 and 2022. The results indicated that both the year and treatment factors had a significant effect on different developmental stages of olive fruit fly including egg, first, second, and third instar larvae and pupae. The treatment effects were significant across all measured traits. Damage assessments revealed that salicylic acid reduced the contamination of fruit to pupae and adult insects due to disruption in egg to larval formation. The year-related effects on various fruit morphological traits, including length, width, weight, volume, density, fruit flesh weight, and kernel dimensions were significant during the two years survey. The treatment effect was significant for all traits except for the width, fruit weight, and flesh weight of the fruit. Analysis of olive oil fatty acid composition demonstrated an increase in oleic and linoleic acids amount in treatments versus control. The concentration of squalene in healthy samples treated with 2 mM salicylic acid was significantly higher than control in 2022. These findings show that salicylic acid can be considered in olive fruit fly integrated management programs The olive fruit fly, Bactrocera oleae (Dip.: Tephritidae), is an important pest affecting olive crops, leading to substantial economic losses and diminishing both the quality and quantity of olive oil production. This study investigated the effects of salicylic acid (SA) treatments at concentrations of 1 mM and 2 mM, with a control, on the Manzanilla olive variety in Rudbar Olive Research Station, Guilan Province during 2021 and 2022. The results indicated that both the year and treatment factors had a significant effect on different developmental stages of olive fruit fly including egg, first, second, and third instar larvae and pupae. The treatment effects were significant across all measured traits. Damage assessments revealed that salicylic acid reduced the contamination of fruit to pupae and adult insects due to disruption in egg to larval formation. The year-related effects on various fruit morphological traits, including length, width, weight, volume, density, fruit flesh weight, and kernel dimensions were significant during the two years survey. The treatment effect was significant for all traits except for the width, fruit weight, and flesh weight of the fruit. Analysis of olive oil fatty acid composition demonstrated an increase in oleic and linoleic acids amount in treatments versus control. The concentration of squalene in healthy samples treated with 2 mM salicylic acid was significantly higher than control in 2022. These findings show that salicylic acid can be considered in olive fruit fly integrated management programs

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