Chemical and Biological Control of Dracaena marginata Leaf Spots in Northern Egypt
Hilal, A.1, Eman El-Argawy2, A. El. Korany2 and Taghreed Fekry1
1Plant Pathology Research Institute, Agriculture Research Center, Giza, Egypt
2Plant Pathology Dept., Faculty of Agriculture, Damanhour University, Egypt
*For correspondence: dreman_elargawy@yahoo.com
Abstract
Six common fungicides, Dithane M45, Kocide 2000, Ridomil Gold Plus, Score, Equation Pro and Kemazed were tested for controlling the draceana leaf spot fungi. All the tested fungicides significantly decreased the in vitro growth of the tested dracaena leaf spot fungi. Percentage of inhibition on colony diameter ranged between 49.64% with Dithane M45 to 82.18% with Score which was followed …show more content…
Meanwhile, in the in vivo tests, treatment with Kemazed decreased disease incidence of leaf spots on potted plants to 16.67% compared to 100% for the untreated inoculated control. On the other hand, the bacterial and fungal biocontrol agents tested proved to be effective against the dracaena leaf spot fungi. The in vitro assays conducted showed that the bacterial biocontrol agents namely, Stenotrophomonas maltophilia, Pseudomonas ultimum, Pseudomonas fluorescens, Pseudomonas putida, Pseudomonas aeruginosa, Bacillus subtilis, Bacillus megaterium, significantly decreased colony growth diameter (76.84%-45.69%) of dracaena leaf spot fungi as well as spore …show more content…
Using fungicides is the most common way to protect plants from diseases and this is a widely accepted in the absence of resistant source. However, application of fungicides is not always efficient. In addition, the hazards and the environmental pollution caused by agrochemicals used for plant diseases control is a worldwide problem. Bio and natural disease control agents might have less risk to the other living beings and also to the environment. However, little literature is available concerning the use of bacterial biocontrol agents against leaf spot diseases of dracaena.
Trichoderma is a fast growing fungus, strong spore producer, source of cell wall degrading enzymes and an important antibiotic producer. Application of Trichoderma spp. as biocontrol agents can also, bring substantial changes in plant metabolism to promote plant growth, increase nutrient availability, improve crop production and enhance disease resistance (Harman et al., 2004).
In Egypt, little information exists on the chemical and biological control of dracaena fungal leaf spots in Egypt. Therefore, the present study was conducted to determine the efficacy of certain chemical fungicides in vitro and in vivo for controlling dracaena leaf spot fungi, and the efficacy of certain bacterial and fungal biocontrol agents against dracaena leaf spot
Hilal, A.1, Eman El-Argawy2, A. El. Korany2 and Taghreed Fekry1
1Plant Pathology Research Institute, Agriculture Research Center, Giza, Egypt
2Plant Pathology Dept., Faculty of Agriculture, Damanhour University, Egypt
*For correspondence: dreman_elargawy@yahoo.com
Abstract
Six common fungicides, Dithane M45, Kocide 2000, Ridomil Gold Plus, Score, Equation Pro and Kemazed were tested for controlling the draceana leaf spot fungi. All the tested fungicides significantly decreased the in vitro growth of the tested dracaena leaf spot fungi. Percentage of inhibition on colony diameter ranged between 49.64% with Dithane M45 to 82.18% with Score which was followed …show more content…
Meanwhile, in the in vivo tests, treatment with Kemazed decreased disease incidence of leaf spots on potted plants to 16.67% compared to 100% for the untreated inoculated control. On the other hand, the bacterial and fungal biocontrol agents tested proved to be effective against the dracaena leaf spot fungi. The in vitro assays conducted showed that the bacterial biocontrol agents namely, Stenotrophomonas maltophilia, Pseudomonas ultimum, Pseudomonas fluorescens, Pseudomonas putida, Pseudomonas aeruginosa, Bacillus subtilis, Bacillus megaterium, significantly decreased colony growth diameter (76.84%-45.69%) of dracaena leaf spot fungi as well as spore …show more content…
Using fungicides is the most common way to protect plants from diseases and this is a widely accepted in the absence of resistant source. However, application of fungicides is not always efficient. In addition, the hazards and the environmental pollution caused by agrochemicals used for plant diseases control is a worldwide problem. Bio and natural disease control agents might have less risk to the other living beings and also to the environment. However, little literature is available concerning the use of bacterial biocontrol agents against leaf spot diseases of dracaena.
Trichoderma is a fast growing fungus, strong spore producer, source of cell wall degrading enzymes and an important antibiotic producer. Application of Trichoderma spp. as biocontrol agents can also, bring substantial changes in plant metabolism to promote plant growth, increase nutrient availability, improve crop production and enhance disease resistance (Harman et al., 2004).
In Egypt, little information exists on the chemical and biological control of dracaena fungal leaf spots in Egypt. Therefore, the present study was conducted to determine the efficacy of certain chemical fungicides in vitro and in vivo for controlling dracaena leaf spot fungi, and the efficacy of certain bacterial and fungal biocontrol agents against dracaena leaf spot