The results from the field studies reflected that developmental biological data on sum of degree-days as a predictive tool could be useful in better decision making to start chemical applications as soon as the appearance of n1 until n4 for Sunn pest control. | Turkish Journal of Agriculture and Forestry Turk J Agric For (2016) 40: 577-582 © TÜBİTAK doi: Research Article Predicting the development of critical biological stages of Sunn pest, Eurygaster integriceps Put. (Hemiptera: Scutelleridae), by using sum of degree-days for timing its chemical control in wheat* 1, 2 3 Celalettin GÖZÜAÇIK **, Abdurrahman YİĞİT , Ziya ŞİMŞEK Department of Plant Protection, Faculty of Agriculture, Iğdır University, Iğdır, Turkey 2 Department of Plant Protection, Faculty of Agriculture, Mustafa Kemal University, Hatay, Turkey 3 Department of Forest Engineering, Faculty of Forestry, Çankırı Karatekin University, Çankırı, Turkey 1 Received: Accepted/Published Online: Final Version: Abstract: This investigation was carried out for possible use of sum of degree-days (total effective temperatures) in order to predict the critical biological stages in chemical control of Sunn pest, Eurygaster integriceps Put. (Hemiptera: Scutelleridae), in 28 wheat fields of Adıyaman, Diyarbakır, and Şanlıurfa provinces from 2007 to 2010, and in climate chamber conditions. Development threshold temperature (°C) of Sunn pest in terms of the life span, starting from egg to new generation of adults, was found as °C. Sums of degree-days starting from 1 January to appearance of the eggs, first-stage nymphs (n1), second-stage nymphs (n2), and fourth-stage nymphs (n4) were found with the averages of , , , and degree-days, respectively. The results from the field studies reflected that developmental biological data on sum of degree-days as a predictive tool could be useful in better decision making to start chemical applications as soon as the appearance of n1 until n4 for Sunn pest control. Key words: Sunn pest, Eurygaster integriceps Put., development threshold, sum of degree-days 1. Introduction Sunn pest, Eurygaster integriceps Put.
