Author : E.P.R. Amorim
Publisher :
ISBN 13 :
Total Pages : 25 pages
Book Rating : 4.:/5 (693 download)
Book Synopsis Biological Control of Phytophtora Citrophtora and P. Nicotianae Var. Parasitica on Citrus by Trichoderma Koningii and T. Harzianum by : E.P.R. Amorim
Download or read book Biological Control of Phytophtora Citrophtora and P. Nicotianae Var. Parasitica on Citrus by Trichoderma Koningii and T. Harzianum written by E.P.R. Amorim and published by . This book was released on 1998 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Phytophthora citrophthora and P. nicotianae var. parasitica are considered to be the most serious soil borne disease affecting citros in Brazil. Biological control of Phytophthora in the orchard is a management option that may ofter potential. Trichoderma spp. are well documented as effective biological control agents, including some pythiaceous fungi. Two isolates of Trichoderma harzianum (Th. 13 and Th. 9) and one isolate of T. koningii (TK.3), Isolated from Sclerotinia sclerotiorum sclerotia, were evaluated against different isolates of Phytophthora in vitro and in a greenhouse bioassay. Isolates Th.13 and Th.9 parasited both Phytophthora species. Isolate Tk.3 completly inhibited the mycelial growth of Phytophthora. Isolate Tk.3 produces a toxic metabolite that inhibit the growth of Phytophthora. Isolate Th.9 consistently was superior to all other isolates in reducing the root disease. Citros seedlings survived an average of 90% whereas those in the contol survived only 30-50%.