Open Access Original Research Article

Agronomic Performance and Organoleptic Characteristics of Local Varieties of Sweet Potato (Ipomea batatas) Cultivated in Mbaiki (Central African Republic)

Gorgon Igor Touckia, Lucie Aba-toumnou, Ephrem Kosh Komba, Cherubin Dan-zi, Kouami Kokou

Asian Journal of Agricultural and Horticultural Research, Page 1-11
DOI: 10.9734/ajahr/2021/v8i430120

In the Central African Republic, there are a multitude of local varieties of sweet potato. However, few studies have been carried their agro morphological and organoleptic characteristics. A Fisher random block device was set up on the three local varieties of sweet potato. The growing and production parameters were evaluated as well as the organoleptic characteristics through the food taste test. The parameters of growing and production were assessed by means of analysis of variance (ANOVA) with one classification criterion using the R software version 3.1.3. A Principal Component Analysis (PCA) was also performed with the growth and yield parameters in order to highlight the correlations between these different parameters. The variety 1 (V1) produced the plants with the largest diameters (1.30 cm), while the smallest diameters was observed in the variety 2 (V2) with 0.55 cm. There is a significant difference (P-value = 0.0001) between the different varieties according to the ANOVA test. According to the length of the tuber, the V2 produced the longest tuberous root than the others with an average of 28.53 cm. The smallest length is observed in the V3 with an average of 25.12 cm. There is not significant (p-value = 0.216) in relation with the length of the tuber for the cultivated varieties of the sweet potato. The eigenvalues of the two main axes extracted from the Principal Component Analysis explained 53.68% and 16.82% of the matrix growth/ yield information. Along the factor axes, apart from parameters such as tuber diameters and length which are not positively correlated, there is little variability between the other parameters which are strongly correlated.

Open Access Original Research Article

Single Stem Rouging of Banana Xanthomonas Wilt Infected Plants for Orchard Rehabilitation

Johnson Kisera Kwach, Peter Sungu Nyakomitta, James Wanjohi Muthomi, Olivier Ndayitegeye, Evelyn Nasambu Okoko

Asian Journal of Agricultural and Horticultural Research, Page 12-25
DOI: 10.9734/ajahr/2021/v8i430122

Banana Xanthomonas Wilt (BXW), caused by Xanthomonas campestris pv. musacearum (Xcm), a devastating disease, causes up to 100% loss and affects all banana varieties. The disease is widespread in East and Central Africa region. Study objective was to evaluate the performance of single stem rouging options for rehabilitation of severely affected banana orchard. Five single stem rouging options were implemented in banana orchard with 80% BXW severity in Western Kenya. The options included rouging of infected banana plants; uprooting, cutting at the base, injecting 20 ml of glyphosate herbicide at the soil base of the pseudostem, uprooting the whole stool and control leaving the infected stools. Initial visual assesment before implementation of the orchard was over 80% infection. Later samples were collected for diagnosis of ten plants per treatment from different plant parts and were subjected to ELISA and PCR procedures for confirmion of the presence of Xcm. Rouging options was implemented for one year. During and after experimentation periodic visual assesment of BXW incidence and severity reduced. Results of ELISA assays and PCR results  indicated Xanthomonas was present on banana plants. Rouging the infected banana stems by cutting at the base, uprooting and injection of herbicide reduced BXW incidence within six months. Xanthomonas, an inhibiting bacteria cannot surve without host and by killing the banana plant the Xanthomonas dies. Yields were recovered from the rehabilitated orchard within one year. Banana orchard highly infected with BXW was effectively rehabilitated.

Open Access Original Research Article

Distribution of Bacterial Disease in the Main Mango Production Areas of Côte d'Ivoire

Brou Kouassi Guy, Doumbouya Mohamed, Oro Zokou Franck, Doga Dabé, Yapo N'guéssan Patrick, Kouassi Koffi II Nazaire, Dogbo Denezon Odette

Asian Journal of Agricultural and Horticultural Research, Page 26-36
DOI: 10.9734/ajahr/2021/v8i430123

Bacterial disease is a major biotic constraints of mango production in Côte d'Ivoire. The objective of this study is to assess the distribution of mango bacteriosis disease in mango production areas in northern Côte d'Ivoire. This study focused on 720 mango trees, of the Kent variety, spread over 20 orchards. These orchards are located in the Bagoué, Tchologo and Poro regions in northern Côte d'Ivoire. The study consisted of determining the incidence and severity of bacterial disease on the leaves and fruits of mango trees. Data on the incidence and severity index of bacterial disease on leaves and fruits were subjected to descriptive analysis followed by PCA. Then, the ascending hierarchical classification (CAH) and multivariate analysis completed the data analysis. The results obtained did not reveal any dissimilarity of the presence of the bacterial disease in the three (3) regions studied. On the other hand, a predominance of the severe or major type of bacterial disease over the level of slight or marginal contamination has been demonstrated. None of the three main regions (Poro, Tchologo and Bagoué) of mango production in Côte d'Ivoire appears to be the center of bacterial disease dispersion at the current stage of bacterial disease progression. The level of incidence and severity of this disease is similar between fruits and leaves. The Principal Component Analysis and the Ascending Hierachical Classification completed by the MANOVA made it possible to structure the mango orchards into three (3) homogeneous groups. Group 2 orchards (VB4, VB8, VB7 and VF2) presented a moderate level of incidence and severity on leaves and fruits.