Black root rot of strawberry plants caused by Rhizoctonia solani, Fusarium solani, and Pythium sp. is a serious disease in Egypt. Biocontrol agents have frequently proved to possess paramount and safe tools against many diseases. The impact of soil treatments with 3 Bacillus pumilus isolates on black root rot disease of strawberry plants caused by R. solani, F., and Pythium sp. under laboratory and field conditions was examined herein on the commonly used ‘Festival’ strawberry cultivar. To increase the bacterial adhesion and distribution on the roots, each seedling was dipped in bacterial cell suspension at 1 × 108 colony-forming units/ml of each separate bacterial isolate for 30 min then mixed with 5% Arabic gum. The tested B. pumilus isolates significantly reduced the growth area of these 3 fungi. The two bacterial isolates Nos. 2 and 3 reduced the growth area by more than 85.2, 83.6, and 89.0% for R. solani, F. solani, and Pythium sp., respectively. Likewise, the 3 bacterial isolates significantly (P ≤ 0.05) inhibited the disease under field conditions. Isolates Nos. 2 and 3 suppressed the disease incidence by 64.4 and 68.9% and disease severity by 65.3 and 67.3%, respectively. The fungicide Actamyl had effect similar to that of the 2 isolates. B. pumilus isolates significantly enhanced growth parameters and yields of strawberry plants; isolates Nos. 2 and 3 raised the yield by 66.7 and 73.3%, respectively. Bacillus pumilus isolates could effectively manage the black rot disease in strawberry herein. Due to the significant impact of the root rot disease on strawberry yield, B. pumilus should be further tested to manage the disease on strawberry on large scale in Egypt.

中文翻译：

---

应用短小芽孢杆菌菌株在草莓黑腐病的管理

草莓枯萎病，茄枯萎病和腐霉菌引起的草莓黑根腐病。是埃及的一种严重疾病。生物防治剂经常被证明具有抵抗许多疾病的最重要和安全的工具。3种短杆菌芽孢杆菌土壤处理对草莓茄黑斑病的影响：茄根腐病菌，腐霉菌和腐霉菌。在实验室和田间条件下，本文对常用的“节日”草莓品种进行了研究。为了增加细菌在根部的附着力和分布，将每株幼苗浸入细菌细胞悬液中，每种细菌分离株以1×108个菌落形成单位/ ml的浓度浸泡30分钟，然后与5％阿拉伯树胶混合。测试的短小芽孢杆菌分离物显着降低了这3种真菌的生长面积。两种细菌分离株 图2和图3分别减少了茄红枯萎菌，茄红枯萎菌和腐霉菌的生长面积，分别超过了85.2％，83.6和89.0％。同样，这三种细菌分离株在田间条件下也能显着抑制该病（P≤0.05）。2号和3号隔离株分别将疾病发生率抑制了64.4％和68.9％，并将疾病严重程度抑制了65.3％和67.3％。杀菌剂Actamyl的作用与2种分离物相似。短双歧杆菌分离物显着提高了草莓植物的生长参数和产量；2号和3号分离株分别提高了收率66.7％和73.3％。短小芽孢杆菌分离物可以有效地控制本文草莓中的黑腐病。由于根腐病对草莓产量的重大影响，埃及应进一步测试短小芽孢杆菌，以大规模控制草莓病。