تقييم كفاءة المبيدين الحيويين الفلوراميل و الباسلين و المبيد الكيميائي البيلتانول في السيطرة على اصابة بذور و بادرات الخيار بالفطر Pythium aphanidermatum (Edson)‎ fitz. وجاهزية المغذيات

الملخص EN

This study consists of the assessment of the antagonistic activity of two biofungicides "Floramil and Bacillin" and some chemofungicides Beltanol against Pythium aphanidermatum for seed and seedling of cucumber " cv.

Bet Alpha" in the field and the characteristics of the both biofungicides for the availability of some nutrients (N,P,K,Fe,Ca and Zn) .

Results indicated many positive effects for the use of the two biofungicides compared with chemical pesticide "Beltanol"., this was due to the rise in the germination precentage for cucumber seed from (72%) in treatment (seed + fungus) to (81.0 and 79.6%) for seeds that dusted by Floramil and Bacillin , respectively , as well as the reduction in the mean of seedling damping-off from (100%) in treatment (seed + fungus) to (9.6 and 10.5%) with the above Biofungicides , respectively .

The most important result found in this experiment and was the increasing number of both Pseudomonas fluorescens and Bacillus cereus.

in the Rhizospher with the presence of Pythium aphanidermatum the numbers were (1.60* 107 and 1.3*107) forming colony unit /g.root in the presence of Pythium aphanidermatum , meanwhile , the numbers were decreased to(1.45* 107 and 1.13* 107) forming colony unit /g.root respectively in the absence of Pythium aphanidermatum .

Results of cucumber leaf contents of macro and micro nutrients revealed that, cucumber seedling treated with "Floramil and Bacillin" proved the ability of Pseudomonas fluorescens and Bacillus cereus in increasing availability of these nutrients compared to the control, the Nitrogen content was risen from (1.20%) in control treatment to (2.30 and 2.15%) in the seedling leaves that treated with Floramil and Bacillin , respectively .

The result was found in phosphorus , its percentages with Floramil and Bacillin reached (0.52 and 0.42%) , respectively ,- compared with (0.18%) gained from control treatmentWhereas , potassium content was the same as mentioned nutrients when seedling treated with Floramil and Bacillin compared with control treatment.

The two biofungicides also produced significant effects in supplying cucumber seedling with micronutrient elements , ferrous content was (38.94 ppm) in seedling treated with FIoramiI,This value was reduced to (20.15 ppm) in control treatment.

copper and zinc contents were the same as Ferrous , leaf content for both was increased compared with that values of Beltanol and control treatments.