Effect of some essential plant oils , fungicides and inducer resistance chemicals on managing peas downy mildew in Libya
Keywords:
Pea, Downy mildew, Essential plant oils, Fungicides and Inducer resistance chemicals, Photosynthesis pigments,, ProteinAbstract
The inhibitory effect of the essential plant oils (EPOs) of cinnamon, citronella, clove, rosemary and thyme, the fungicides Dithan M-45, Kocide 200, Folio-Gold, Privicur-Enargy and Ridomil Gold-MZ and the inducer resistance chemicals (IRCs) , Bion (BTH), chitosan and salicylic acid, on sporangial germination of the fungus like Peronospoa viciae (Berk.) Casp. f. sp. pisi Sydow (formerly P. pisi), the causal of pea downy mildew, was investigated in vitro. The role of the tested materials on management of pea downy mildew was, also, evaluated under greenhouse conditions. The inhibitory effect of the tested EPOs, fungicides and IRCs on sporangial germination of P.viciae f. sp. pisi showed that they caused significant reduction to the germinated sporangia compared with control treatment. In this concern, the tested fungicides were the most efficient ones followed by the EPOs then IRCs. Management of the disease showed the same trend of in vitro assessment when they sprayed on artificially inoculated pea plants with the sporangial inoculum of the pathogen under greenhouse conditions. The reduction in the severity of the infection by pea downy mildew was reflected on the estimated crop parameters, photosynthesis pigments, and percentages of total nitrogen and total crude protein, which considerable increase was recorded due to the treatment with the teste EPOs, fungicides and IRCs.
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