University of Guilan Plant Pest Research 2322-2409 10 4 2021 02 19 Seasonal dynamics of population and infestation of peach twig borer, Anarsia lineatella Zeller (Lep.: Gelechiidae) on different varieties of peach in Mazandaran Seasonal dynamics of population and infestation of peach twig borer, Anarsia lineatella Zeller (Lep.: Gelechiidae) on different varieties of peach in Mazandaran 75 89 4633 10.22124/iprj.2021.4633 FA S. Mafi Pashakolaei Department of Plant Protection, Mazandaran Agricultural and Natural Resources Research and Education Center, Sari, Iran Journal Article 2021 02 22 Peach twig borer, <em>Anarsia lineatella</em> Zeller, as one of the most important pests of stone fruit trees in Iran and worldwide, causes severe damage annually. In this research, the pest seasonal dynamics on early (<em>Prunus persicae</em> var. keres), moderate (<em>Prunus persicae</em> var. zafarani) and late (<em>Prunus persicae</em> var. sibi) ripening peach cultivars was studied by using pheromone traps in three orchards (1 ha), in Mazandaran province during 2012-2013. Four pheromone traps were placed at 1.5-2 m height per orchard for weekly monitoring the adult moths. To determine the larval infestation, 10 trees (per orchard) were selected and 40 new shoots and 100 fruits (from each tree) were randomly inspected per week. The results indicated that <em>A. lineatella</em> had 3-4 generations and overwintered as 1^st and 2^nd instar larvae inside terminal parts of infested shoots. The first moths were trapped in mid-April with maximum population appeared three weeks later, coinciding with main flushing stage of the trees. The three main peaks of the moths were observed in April, June and July, which almost concur with the huge flushing stage of the trees. The 1^st generation larvae generally attacked the new shoots. Feeding activity of second generation of pest was very important for moderate and late ripening cultivars. Fruit damage on moderate and late ripening cultivars was determined around 4.2 and 5.5 percent, respectively. In conclusion, under high density of 2^nd and 3^rd generations, severe damage on the fruits may be expected and consequently control recommended. Peach twig borer, <em>Anarsia lineatella</em> Zeller, as one of the most important pests of stone fruit trees in Iran and worldwide, causes severe damage annually. In this research, the pest seasonal dynamics on early (<em>Prunus persicae</em> var. keres), moderate (<em>Prunus persicae</em> var. zafarani) and late (<em>Prunus persicae</em> var. sibi) ripening peach cultivars was studied by using pheromone traps in three orchards (1 ha), in Mazandaran province during 2012-2013. Four pheromone traps were placed at 1.5-2 m height per orchard for weekly monitoring the adult moths. To determine the larval infestation, 10 trees (per orchard) were selected and 40 new shoots and 100 fruits (from each tree) were randomly inspected per week. The results indicated that <em>A. lineatella</em> had 3-4 generations and overwintered as 1^st and 2^nd instar larvae inside terminal parts of infested shoots. The first moths were trapped in mid-April with maximum population appeared three weeks later, coinciding with main flushing stage of the trees. The three main peaks of the moths were observed in April, June and July, which almost concur with the huge flushing stage of the trees. The 1^st generation larvae generally attacked the new shoots. Feeding activity of second generation of pest was very important for moderate and late ripening cultivars. Fruit damage on moderate and late ripening cultivars was determined around 4.2 and 5.5 percent, respectively. In conclusion, under high density of 2^nd and 3^rd generations, severe damage on the fruits may be expected and consequently control recommended. https://iprj.guilan.ac.ir/article_4633_6a975c9502e17ca3b09f4822dbc19639.pdf