جستجوی مقالات مرتبط با کلیدواژه « دیفنوکونازول » در نشریات گروه « گیاهپزشکی »

The present study aimed to find out the minimum effective concentration of Miravis Duo®75 (SC 200) fungicide for preventing the progress of tomato powdery mildew disease caused by Leveillula taurica, in comparison with Signum® fungicide under field conditions. Two experiments were performed in Karaj and Mashad using Randomized Complete Block Design (RCBD) with five treatments and four replications. Treatments were three concentarions of Miravis Duo® (700, 1000 and 1200 ml/ha), Signum® (500 g/ha) as reference fungicide and water spraying as the control. Foliar spraying of experimental plots was started as the first disease symptoms appeared and repeated four times at 11 days intervals. The effect of treatments was assessed before each spraying by estimating the percentage of plant foliage covered by powdery mildew for five randomly selected plants in each replication. Analysis of variance of data in both locations showed that the effect of treatments on disease severity index (DSI) and the Area Under Disease Progress Curve (AUDPC) were significantly different (P≤ 0.01). Also in both locations, there were significant differences between 700 ml/ha of Miravis Duo® and the other two Miravis Duo® concentrations of this fungicide (1000 and 1200 ml/ha) as well as Signum® fungicide, in reducing DSI , although  there were not statistically significant difference between  1000 and 1200 ml/ha concentrations.  The efficiency of 1000 and 1200 ml/ha concentrations were 59% and 65.5% respectively compared to the control, which were not significantly different with Signum®. Therefore the minimum effective dose of Miravis Duo ® fungicide for controling tomato powdery mildew is 1000 ml/ha which recommended alternatively with other registered fungicides.

Efficacy of difenoconazole+cyflufenamid (Cidely-Top® DC 14%) in control of cucumber powdery mildew, caused by Golovinomyces cichoracearum was evaluated using RCBD with 6 treatments and 4 replications in Alborz, Tehran and Khuzestan provinces. Treatments included 0.8, 0.9 and 1 ml L-1 of Cidely-Top®, tetraconazol (Domark® EC 10%) 0.4 ml L-1, bicarbonate potassium (Kaliban® SL 85%) 5 g L-1 along with no spraying control. Foliar sprayings started once early symptoms appeared and followed up at 5-10 days intervals. The data noted before each spraying and 14 days after the last spraying as the DSI by using Horsfall and Barrat scale from 1-7. Mid-point was using for each plant. AUDPC was calculated for each plot, too. Data were analyzed by SAS software and means were compared using DMRT (P=5%). Comparison of the efficacy of treatments based on the AUDPC which displays cumulative percentage of disease during a 36 days period revealed that Cidely-Top®  0.8, 0.9 and 1 ml L-1 have reduced the AUDPC by 74.9%, 81.2%, and 85.2% respectively in comparison with the control. Meanwhile, the Domark® at the rate of 0.4 ml L-1 resulted in the efficacy of 82.7% and Kaliban® also showed the least amount of efficacy (59.8%) compared with the control. Based on the results obtained from this research, the fungicide Cidely-Top® may be recommended to be used at 0.8 ml L-1 for 5 to 7 days intervals, at 0.9 ml L-1 for 7 to 10 days intervals and at 1 ml L-1 for up to 14-days intervals.

Mosses are a group of simple, small and xerophyte plants that have been shown to have anti-cancer, anti-microbial and anti-fungal effects. In this study, the inhibitory effects of ethanolic and aquatic extracts of a moss species named Cinclidotus fontinaloides on the growth of two phytopathogenic fungi Fusarium solani and Bipolaris sorokiniana, the causal agents of root and stem rot in crops, especially wheat, were studied by using disk diffusion method on PDA medium and mixing with culture medium to determine the MIC and compared with the effect of industrial fungicides benomyl, difenoconazole and tetraconazole. Data were analyzed by using SAS software v. 9.2 and the means were compared by using Duncan's test (P <0.05). The results confirmed the inhibitory effect of different extracts on the fungi, but ethanolic extracts showed higher growth inhibitory effects on F. solani; further more aquatic extract had the same effects on tested fungi. To investigate the effect of moss extracts on the growth of these fungi in vivo, Chamran cultivar seeds were mixed with moss extracts planted in pots containing a ratio of 1:10 mixture of soil and soil contaminated with fungi and kept in a greenhouse at 25 ° C and natural light for 35 days. After the prescribed period, the rate of root and stem rot of wheat plants was examined. The results show a reduction in the rate of rot in treated pots compared to control pots.