The present study focuses on the evaluation of the potential of a Tunisian Bacillus thuringiensis (Bt) isolate named Hr1, isolated from dead and diseased pod borer, Helicoverpa armigera Hübner (Lepidoptera: Noctuidae) larvae under laboratory and field semi-controlled conditions. The bacterial strain Hr1 showed an insecticidal activity against the pest’s neonates in comparison to the spinosad-based insecticide (Tracer 240 SC®) during bioassays under laboratory conditions. A carboxymethyl cellulose-talc (CMC-talc)-based formulation of the Bt isolate was prepared to evaluate the potential of the bacterium on tomato plants infested with H. armigera under semi-controlled field conditions with and without rain simulation. The results showed the efficacy of the formulation than the spinosad-based insecticide and the treatment with unformulated bacterium. The results also showed the persistence of Bt isolate activity even after rain-wash than the treatment with unformulated bacterium.

中文翻译：

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一个评价苏云金芽孢杆菌靠在食心虫基于分离物的制剂，棉铃虫棉铃虫（夜蛾）

本研究的重点是评估在实验室和现场半控制条件下从死于或患病的荚bore，Helicoverpa armigeraHübner（鳞翅目：夜蛾科）幼虫中分离出来的名为Hr1的突尼斯苏云金芽孢杆菌（Bt）分离物的潜力。在实验室条件下的生物测定过程中，与基于多杀菌素的杀虫剂（Tracer 240SC®）相比，细菌菌株Hr1对害虫的新生儿具有杀虫活性。制备了基于Bt分离物的羧甲基纤维素-滑石粉（CMC-talc）的制剂，以评估在半模拟田间条件下（不论是否模拟雨水）该细菌对棉铃虫侵染的番茄植株的潜力。结果表明该制剂比基于多杀菌素的杀虫剂和用未配制的细菌治疗的功效。