تقييم فعالية البولي أثيلين كلايكول و بعض المستخلصات النباتية المستحضرات الحيوية ضد أنواع الجنس Fusarium المرافقة لبذور الزينيا

الملخص EN

The study was carried out to evaluation the effect of PEG, some plant extracts and bioprepreations on the some species of Fusarium associated with zinnia seeds.

Under green house conditions, the results of the evaluation the efficiency of PEG in protect of zinnia seeds from Fusarium culmorum (A33), F.

oxysporum (F14), F.

solani (F19) and F.

verticillioides (B24), indicted that the percentage of germination capacity and seed germination for seeds primed with PEG solution and planted in inoculated soils with these isolates was 27.5-50 % and 37.5-55 % compared to unprimed seeds : 5-10 % and 7.5-12.5 % respectively.

Isolate F.

solani (F19) gave highest decrease in percentage seed germination and capacity with primed seeds.

Laboratory results of evaluation the efficiency of many concentrations of alcoholic extract of coontail, lotus and the biopreparations of Sea bloom 29, Bioimmune and grape extract, had shown that the alcoholic extract of coontail 200 mg / L caused a significant superiority in the inhibition of these isolates (59.5-77.72 %) followed by Bioimmune 12 % (50-75 %) and grapefruit extract (50.52-66.6 %) compared to control (0 %).

Lotus extract in all concentration did not give any effect against isolates.

Results of the greenhouse test, indicated the coontail extract, Bioimmune and Beltanol caused a significant reduction in disease incidence and severity, so a significant increase in wet and dry weight in all isolates.

Isolate F.

solani (F19) caused higher reduction in disease incidence and severity (22.5 %-11.7 %), so higher increase in wet and dry weight (1.135 gm, 0.097 gm) respectively compared with control (97.5 %, 90 %, 0.285 gm and 0.020 gm respectively).