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Plant Pathology Journal
eISSN: 1812-5425
pISSN: 1812-5387

Editor-in-Chief:  Mohamed Abdul Rahman Elwakil
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Research Article
Control of Gray Mold Disease of Tomato by Postharvest Application of Organic Acids and Salts
Fayza Tahiri Alaoui, Latifa Askarne, Hassan Boubaker, El Hassane Boudyach and Abdellah Ait Ben Aoumar
Background and Objective: Tomato is the major fruit crop produced and exported in Morocco. This commodity is faced to many threats. The most important tomato diseases caused commercially significant losses, in Morocco and worldwide, is gray mold caused by Botrytis cinerea. This study was aimed to find out an alternative to synthetic fungicides used in the control of the polyphagous devastating fungus ‘Botrytis cinerea’ using common food additives. Materials and Methods: Thirty seven organic acids and salts considered as common food additives were tested in vitro against this pathogen using the agar dilution method. Compounds with the best antifungal activity, selected after one-way analysis of variance, were tested in vivo on artificially inoculated tomato fruit. Results: At 0.02 M, EDTA, copper sulfate and sodium metabisulfite completely inhibited the mycelial growth and sporulation of B. cinerea. The lowest Minimum Inhibitory Concentration (MIC) and Minimum Fungicidal Concentration (MFC) were recorded in sodium metabisulfite treatment. The conidia germination was inhibited by ammonium molybdate and sodium metabisulfite treatments at only 10 mM. The nine most active chemicals in the in vitro trials were tested in vivo on tomato fruit. The incidence and the severity of gray mold were significantly reduced by EDTA, potassium carbonate, sodium bicarbonate, sodium carbonate, sodium metabisulfite and sodium salicylate compared to 100% (incidence and the severity) in the control. Conclusion: The results of the current study suggest that these salts are potentially useful as postharvest GRAS compounds to control B. cinerea on tomato fruit.
Research Article
Distribution and Incidence of Cassava Anthracnose in Côte D’ivoire and Pathogenic Characteristics of Colletotrichum gloeosporioides Penz Manihotis Isolates
YEO Foungnigue Edwige, EHUI Kouadio Jean Nestor, AMARI Ler-N`Ogn Dade Georges Elisee, N`Guetta Assanvo Simon-Pierre and KONE Daouda
Background and Objective: Anthracnose caused by Colletotrichum gloeosporioides Penz manihotis is one of the major constraints of cassava production in the world. However, in Côte d’Ivoire, there is little work on the evolution of this disease, which could make it possible to envisage an effective strategy to fight against its spread. This study aims to establish the distribution and the incidence of anthracnose in Côte d’Ivoire on the one hand and to determine the morphological and pathogenic characteristics of Colletotrichum gloeosporioides Penz manihotis isolates on the other hand. Materials and Methods: Assessments of the disease followed through two surveys, in 2014 and 2015, in all the agro-ecological zones on the different varieties of cassava cultivated. The isolates of Colletotrichum gloeosporioides Penz manihotis were analyzed morphologically and their pathogenic activity was evaluated after inoculation to cassava plants under controlled conditions. The data collected were analyzed using Statistica software version 7.1 and then by using ANOVA (one-way). Results: The infection has reached epidemic levels with a national average incidence of 39.44% resulting from an infestation rate of 72% in all the fields visited. The analysis of certain morphological characteristics showed the existence of a phenotypic diversity in the strains of Colletotrichum gloeosporioides Penz manihotis. The pathogenic activity of these isolates, under controlled conditions, also revealed heterogeneity of aggressiveness on cassava varieties. The improved variety (Bocou 1) appeared sensitive as the traditional variety (Yacé) with an average sensitivity score of 27.5. Conclusion: Cassava anthracnose was found in all seven agro-ecological zones of Côte d’Ivoire with variable incidence from one plot to another. In addition, the isolates of C. gleosporioides Penz manihotis were different in appearance, color and growth of their mycelium and in their aggressiveness on cassava varieties. Results of this study required to find effective methods of fight against this disease.

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