Bacterial wilt (BW) disease caused by Ralstonia solanacearum species complex is a devastating plant disease that inflicts heavy losses to the large number of economic host plants it infects. In this study, the potential of dried powder of the arid-land medicinal shrub Rhazya stricta to control BW of tomato was explored. Both, in vitro and in planta studies were conducted, using different concentrations of dried powder of plant parts, and applied (surface mulched or mixed) to infested soil at 0, 10, and 20 days before transplanting (DBT). Aqueous extract of leaves (16% w/v) was found to be as effective as streptomycin (100 ppm) in inhibiting the in vitro growth of R. solanacearum. As evident from the scanning electron micrograph, 16% aqueous extract of leaves produced severe morphological changes, such as rupture of the bacterial cell walls. Results from the greenhouse experiments demonstrated that the higher powder dose (succulent shoot), namely, 30 g/kg of soil mixed with infested soil 20 DBT, was found to be the most effective in controlling BW. It increased root length (cm), shoot length (cm), and plant fresh biomass (g) by 55, 42, and 40%, respectively, over control plants. Mixing of plant powder with the artificially infested (35 ml of 10⁸ CFU/ml per kilogram of soil) pot soil was better than surface mulching. The 30 g/kg of soil dose mixed with soil increased root length (cm), shoot length (cm), and plant fresh biomass (g) of treated plants by 67, 36, and 46%, respectively, over control plants. A 37% decrease in disease severity over the control was observed with drench application of 30 g of powder per kilogram of soil applied once at 20 DBT. Our results indicated that the dried powder (30 g/kg of soil) of leaves or succulent shoots of R. stricta, thoroughly mixed with soil, 20 DBT, could act as an effective control method against BW.

由青枯菌（Ralstonia solanacearum）种复合物引起的细菌性枯萎病（BW）是一种毁灭性植物病，给它感染的大量经济寄主植物造成了严重损失。在这项研究中，研究了旱地药用灌木Rhazhya stricta干粉控制番茄BW的潜力。使用不同浓度的植物部分干粉进行了体外和植物研究，并在移植前0、10和20天（覆盖或混合）施用于受侵染的土壤。发现叶片的水提取物（16％w / v）在抑制青枯菌体外生长方面与链霉素（100 ppm）一样有效。从扫描电子显微镜照片可以明显看出，叶子的16％水提物产生了严重的形态变化，例如细菌细胞壁破裂。温室实验的结果表明，较高的粉剂剂量（多汁的芽），即30 g / kg的土壤与侵染的20 DBT的土壤混合，被发现对控制BW最有效。与对照植物相比，它分别使根长（cm），苗长（cm）和植物新鲜生物量（g）增加了55％，42％和40％。将植物粉与人工感染的植物混合（35毫升10 ⁸CFU / ml每千克土壤）比覆盖土壤更好。与对照植物相比，与土壤混合的30 g / kg土壤剂量分别使处理过的植物的根长（cm），苗长（cm）和植物新鲜生物量（g）分别增加67％，36％和46％。通过在20 DBT下每公斤土壤施以30克粉末，每公斤土壤浸湿30克粉末，可观察到疾病严重程度比对照组降低37％。我们的结果表明，与土壤充分混合的严格的红景天叶片或肉质芽的干燥粉末（30 g / kg土壤），可以达到20 DBT，可以作为防治BW的有效方法。