Biological differences between Iranian isolates Bacillus thuringiensi from Yazd and Booshehr provinces on Helicoverpa armigera (Hubner)

Subject Areas : Plant Pests

Samaneh Khairi ¹ ( Science and Research Branch, College of Agriculture and Natural Resources, Department of Entomology, Tehran, Iran )
Mohammad Reza Reza Panah ² ( Biological control Research Department, Iranian Research Institute of Plant Protection (IRIPP), Tehran, Iran )
Mahmood Shojaei ³ ( Science and Research Branch, College of Agriculture and Natural Resources, Department of Entomology, Tehran, Iran )
Gholamreza Salehi Jozani ⁴ ( Agricultural Biotechnology Research Department, Karaj, Iran )
Neda Kheradpir ⁵ ( Assistant Professor, Department of Plant Protection, Varamin-Pishva Branch, Faculty of Agriculture, Islamic Azad University, Varamin, Tehran, Iran. )

Received: 2015-05-23 Accepted : 2015-11-19 Published : 2015-11-22

Keywords: Yazd, Bacillus thuringiensis, bioassay, BR4 isolate, Booshehr, YD5 isolate,

Abstract :

Bacillus thuringiensis (Bt), belonged to Bacillaceae is one of the most important pathogenic bacteria and considered as an effective biological control agent in many pest management programs. This species can be an applied replacement for chemical pesticides. Diverse potentials of Bt on different pest species have emerged from not only its diverse serotypes, but also varied isolates. Helicopverpa armigera (Lepidoptera: Noctuidae) is a serious cotton pest with different plant host species. In this study, mortality rate of the pest larvae by two Iranian native isolates of Bt, from Yazd (YD5) and Boushehr (BR4) farmland was assessed. Then LC50 for each isolate on neonates obtained. Dipel was used as the control. Bioassay result showed that LC50 for Dipel, YD5 and BR4 were 68.2864 spore/ml, 48× 106 spore/ml and 77× 1012 spore/ml, respectively. YD5 showed partial higher performance in comparison to other native isolate.