Bicontrol of R. solani AG-4 with piperitone product from Cymbopogon proximus and comparison with bicontrol agents (Trichoderma spp) [electronic resource].

Includes references.

In vitro antagonism experiments were carried out to study the ability of five biocontrol agents (: Trichoderma harzianum T. asperellum, T. hamatum, T: virenes and T. viride) and fourteen plant extracts for their effects on the growth of mycelia of R. solani AG.4. T. harzianum was recorded the maximum inbibitor of mycelial growth followed by T. asperellum with average of the inhibition growth 56.82% and 54.48 %, respectively. Results showed also that significant antifungal activity was detected for the extracts of Cymbopogol1 proximus, and Ruta chalepensis.. These extracts were effective in inhibiting the mycelial growth of R. saolani AG-4, (at amount/disc. 4 mg) with an average of 22.S9and 21.48 respectively, Comparison studies of the inhibitory effects of piperitone, biocontrol agents mill fungicide (Rizolex) on DSI, leugth (cm), fresh and dry weight (gm) or bean plants were also recoded. Torments of piperitone in the presence or R. solani Ag-4 showed the best control of dry root rot and stem bean disease there are also reduction effect in disease severity with average 1.00. compared with inoculated bean plants with R. solani AG-4 alone with average 3.65. R. solani; AG-4. In the presence of T. asperellum or T. harziollum or Fungicide (Rizolex) were also recorded reduction in disease severity with average of 2.41 and 1.66, 1.91. respectively.

Summary in Arabic.

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