Effect of zinc, ferrous, manganese and boron on cowpea rust disease [electronic resource].

Includes reference.

Detection of cowpea rust disease was carried out in 13 distracts of Dakahlia govemorate. The high disease incidence was in Sherbin distract followed by Tmai Elamdid distract. While. the low disease incidence was in Aga distract. On the other side, the high value of disease severity occurred under Tmai Elamdid, Mit Salsyl and Bilqas distracts. While, Minit Elnasr distract was came late. Foliar application of microelements at all tested concentrations and also fungicide (Plantvax 20% EC 1mil) significanlly decreased the infection with Uromyces vignae. The best results were obtained from boron at 0.05 gil followed by manganese 3 gil then ferrous 3 gil. All tested microelements caused significant increase in plant height and number of branches. leaves and podslplant. The low concentration was more effective than the higher one except ferrous which gave the reverse, While there was no significant effect due to fungicide treatment on these parameters. The highest values of 100-seeds weight occurred under boron application at 0.05 gil followed by manganese at 3 gil then boron 0.025 gil. The high total phenol content in cowpea leaves were obtained from the application of boron at 0.05 gil followed by manganese at3 gil then manganese 2 gil. In all tested microelements treatment a significant increase in chlorophyll a. band caroteinoids content was achieved compared with fungicide and check treatments, This study indicates that, there is a correlation between induced resistance for rust disease and accumulation of phenols.

Summary in Arabic.

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