In the current study, we used high-performance liquid chromatography (HPLC) and gas chromatography–mass spectrometry (GC–MS) to investigate and analyze the methanolic extract of Salvia rosmarinus leaves. HPLC analysis showed that the extract revealed a diverse array of polyphenolic compounds, including apigenin, catechin, chlorogenic acid, cinnamic acid, caffeic acid, coumaric acid, daidzein, ellagic acid, ferulic acid, gallic acid, hesperetin, kaempferol, methyl gallate, naringenin, pyrocatechol, quercetin, rutin, syringic acid, and vanillin. Furthermore, three fungal isolates from symptomatic strawberry plants were obtained and identified as Botrytis cinerea (OR116486), Fusarium oxysporum (OR116505), and Rhizoctonia solani (OR116525). The extract’s antifungal activity was evaluated at concentrations of 0, 50, 150, 200, and 300 µg/mL. At 200 µg/mL, the extract showed growth inhibition percentages of 74.56, 58.19, and 56.67% for R. solani, F. oxysporum, and B. cinerea, respectively, while at 300 µg/mL, all the tested fungi were completely suppressed. The GC–MS analysis revealed that the major compounds of the methanolic extract identified based on their retention times and relative peak areas (%) included β-caryophyllene (12.06%), germacrene d (13.55%), caryophyllene oxide (3.13%), methyl palmitate (5.26%), hexadecanoic acid (4.9%), and methyl stearate (6.02%). These results show rosemary extract’s potential as a source of natural antifungal agents against plant photogenic fungi. As a result, it provides a safer alternative to the current protective approaches for plant disease management.

Methanolic extract from Salsola imbricata was investigated for its phytochemical content, antioxidant, and antimicrobial properties against phytopathogenic fungi and bacteria. Phytochemical analysis revealed the presence of saponin, tannins, and alkaloids with 1.25%, 18.8 mg catechin/g of extract, and 9.12%, respectively. Total flavonoid content was 20.8 mg quercetin equivalent/g while total phenolic content was 202 mg gallic acid equivalent/g. Antioxidant activity using the 2,2-diphenyl-1-picrylhydrazyl assay resulted in an IC₅₀ value of 48.61 µg/mL, while the phosphomolybdenum method yielded a value of 215.43 mg ascorbic acid equivalent/g of extract. The highest phenolic acids detected in the extract were gallic acid (712.97 µg/g), syringic acid (742.7 µg/g), and caffeic acid (474.70 µg/g) according to high-performance liquid chromatography analysis. Palmitic acid (28.38%) dominated the fatty acids identified by gas chromatography–mass spectrometry, while stigmasterol (8.34%) was the most abundant steroid. At a concentration of 3 mg/mL, the extract showed strong antibacterial activity against Pectobacterium carotovorum (10.50 mm), Ralstonia solanacearum (9.93 mm), and Pectobacterium atrosepticum (8.37 mm). Additionally, the extract significantly suppressed fungal growth of Rhizoctonia solani (38.22%) and Fusarium oxysporum (33.56%) but showed lower activity toward Botrytis cinerea (13.33%) at 5 mg/mL. In conclusion, S. imbricata extract exhibited promising antioxidant and antimicrobial properties, making it a potential candidate for further exploration in agricultural applications.

Natural products derived from plants are emerging as a valuable resource for a range of antimicrobial agents in sustainable agriculture. The current work looks for the first time at the antimicrobial properties of a methanolic extract of Bienertia sinuspersici against phytopathogenic microorganisms in vitro, using disk diffusion and food poisoning techniques. The phytochemical analysis revealed the presence of total phenols, flavonoids, and antioxidant activity measured at 34.2, 20.6, and 20.1 mg/g, respectively. Furthermore, the concentrations of tannins, saponins, and alkaloids were documented at 17.6, 9.8, and 3.2 mg/g, respectively. The high-performance liquid chromatography examination of polyphenolic chemicals revealed that gallic acid was the most abundant compound at 2.22 mg/g, whereas methyl gallate was the least abundant at 0.021 mg/g. Gas chromatography–mass spectrometry analysis revealed that the primary components were oleic acid, n-hexadecanoic acid, and methyl ester of 11-octadecenoic acid. The extract had a maximal inhibitory percentage of 57.8% against Fusarium oxysporum at 300 µg/mL, 60.4% against Rhizoctonia solani at 500 µg/mL, and 88.2% against Botrytis cinerea. On the other hand, the extract demonstrated inhibition of Pectobacterium atrosepticum growth by 10.67 mm at a concentration of 100 µg/mL, while Ralstonia solanacearum was inhibited by 9.76 mm and Pectobacterium carotovorum by 9 mm. Overall, the extract of B. sinuspersici demonstrated promising efficacy as antibacterial and antifungal agents against different plant pathogens. Therefore, it could offer a sustainable and environmentally friendly alternative for managing plant diseases.

Fusarium wilt, caused by Fusarium oxysporum f. sp. lycopersici , threatens global tomato production, with losses reaching 80%. Although chemical fungicides are effective, their prolonged use risks resistant strains, reduces soil biodiversity, and causes environmental damage, highlighting the urgent need for ecofriendly alternatives. This study investigated the viability of Salvia officinalis (sage) methanolic extract as a biocontrol agent against Fusarium wilt (FW), employing a comprehensive approach that incorporates in vitro, in vivo, and molecular docking techniques. Four distinct isolates of F. oxysporum were identified through molecular techniques, and their virulence was assessed by examining the presence of tomatinase genes. The antifungal properties of S. officinalis extract were found to be compelling, with a total phenolic content of 64.15 mg GAE/g and a remarkable antioxidant activity of 97.04%. In laboratory tests, S. officinalis exhibited potent antifungal activity, inhibiting mycelial growth by between 52.00% and 88.67% at a concentration of 20 mg/ml. Additionally, in vivo experiments demonstrated a significant reduction in disease severity in treated tomato plants. Molecular docking analyses revealed strong binding affinities between key phytochemicals in the extract and target receptors such as tomatinase, highlighting the potential of the extract as a sustainable and effective alternative to chemical fungicides for managing FW in tomato crops.

Fungicides considered as most effective method of controlling powdery mildew diseases on cucurbits, but there remains more than one challenge facing this method, and one of major challenges is resistance in pathogen populations, as well as their harmful impact on the ecosystem. Six commercial algae products besides green algae extract were applied to estimate their effectiveness against powdery mildew disease in squash plants under field condition during two successive seasons 2020-2021. In addition to studying the role of algal formulations used in increasing the resistance of squash plants against powdery mildew, this is through its effect on some biochemical changes within the plant, which in turn increases the plant's ability to resist disease. The results of this study showed that the correlation between the incidence of the disease and the content of the leaves of total soluble phenols is negative, and the value of this correlation reached 28%.The same result was obtained with the leaves content of total proteins, the correlation value reached 51%. PPO and acid invertase showed the same trend. In the end, we can say that the use of algal extracts and their formulations may provide an ideal choice to control powdery mildew disease on squash plants, whether by its direct effects on the disease or even through the indirect effect by increasing the level of phenolic substances and proteins as well as stimulating some enzymatic systems through which the plant can defend itself against disease.