![]() Prevalence of CBB was negatively correlated with annual precipitation and positively correlated with maximum temperature of the ecozones, while prevalence of CAD had strong positive relationship with the annual precipitation and negative association with maximum temperature. In both HF and DS, more than 30% of fields in 2001, and less than 20% in 2003, had highly severe CAD symptoms. In both surveys, more than 80% of CBB infected fields in all ecozones were moderately severe, except in SS where 47% of fields in 2003 were highly severe. ![]() CAD prevalence was greater than 90% in HF for the two surveys, 44.7% and 61.5% for 20 respectively in DS, while it was not observed in the other zones. CBB prevalence was greater than 70% in all ecozones in 2001 33.7% in HF, 65.7% in DS and greater than 90% in others in 2003. ![]() A total of 132 fields were visited in 2001 as follow: humid forest (HF) 42, derived savannah (DS) 38, southern guinea savannah (SGS) 16, northern guinea savannah (NGS) 16 and Sudan savannah (SS) 20. Geo-referenced surveys were conducted in 20 to assess the prevalence and severity of cassava bacterial blight (CBB) and cassava anthracnose disease (CAD) in different agro-ecological zones of Nigeria. Incidence and severity are strongly related to the humidity conditions of the production area. Mango bacterial black spot is found in orchards located in the Poro and Tchologo regions. As for severity, the highest values, 10.58% and 5.23% on leaves and fruits respectively were recorded in the department of Tafiéré. Statistical analysis of the mean incidence and severity per town revealed a variability of 83.2% up to 90% on the leaves and 41.42% up to 55% on the fruits regarding incidence. Mangiferaeindicae, was systematically isolated basing on symptoms taken from the leaves and fruits collected. Bacterial black spot symptoms were observed in all orchards and the bacterium, Xanthomonas campestris pv. At fruiting stage, bacterial black spot severity on 40 fruits per selected tree, at the rate of 10 fruits per cardinal point was assessed. On each tree, three (3) twigs per cardinal point were selected then the leaves counted and the leaf area covered by bacterial black spot symptoms determined. In each orchard, 5 mango trees regularly dispersed over an area of 0.5 ha were assessed. Surveys were carried out during the vegetative stage of mango trees from July to August 2019 and the fruiting stage from March to April 2020 in 50 orchards in the Poro and Tchologo regions. ![]() This study aims at diagnosing bacterial black spot incidence and severity level in regions of intensive mango production. Mango bacterial black spot is an emerging disease in Côte d'Ivoire and the damage caused is becoming more and more significant. ![]()
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