Potential of Exserohilum rostratum as bioherbicide for controlling Digitaria ciliaris

Ching, Gek Soo (2007) Potential of Exserohilum rostratum as bioherbicide for controlling Digitaria ciliaris. [Project Paper] (Submitted)

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Abstract

The potential of Exserohilum rostratum (Drechsler) Leonard & Suggs as a bioherbicide for controlling southern crabgrass (Digitaria ciliaris) was evaluated in this study. The mycelial growth and sporulation was affected artificially by different light periods. The reductions of light periods significantly increased sporulation of E. rostratum. Meanwhile, the effect of surfactants on mycelial growth and sporulation varied with surfactant concentration (0, 0.01, 0.05, 0.1, 0.5 and 1 %). Both surfactants (Tween 20 and Act-Fast) increased the mycelial growth under lower surfactants concentration. Based on the results of pathogenicity tests, E. rostratum was highly pathogenic to D. ciliaris. The initial disease symptoms appeared with tiny spots and water soaking reactions which rapidly developed into elongated dark brown necrotic streaks. As the disease progressed, the inoculated plants were severely infected and turn to light brown; it finally died with dries up. The disease development of E. rostratum on different growth stages of D. ciliaris was expressed by the AUDPC and the steepness of slope (rL). Two leaf-stage plants were most susceptible to E. rostratum (rL = 1.01 logit / day; AUDPC = 610.75). From the greenhouse trial, E. rostratum was pathogenic to 2 weeks old crops seedlings (Zea mays and Oryza sativa). However, Zoysia matrella was resistant to the disease and Ophiopogon japonicus was immune to the disease. Additional studies are needed to develop the appropriate formulations and delivery method to improve the efficacy of bioherbicide. From this study, E. rostratum had demonstrated the potential as a bioherbicide for controlling D. ciliaris.

Item Type:	Project Paper
Faculty:	Faculty of Agriculture and Food Sciences
Depositing User:	Mr. Azman Mohamad
Date Deposited:	17 Dec 2024 02:23
Last Modified:	17 Dec 2024 02:23
URI:	http://psaspb.upm.edu.my/id/eprint/2245

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