Leaf and fruit spot (Pseudocercospora angolensis) disease of citrus attacks leaves, fruits, and young twigs of the plant. The disease can cause a yield loss of (50% to 100%) in areas with high rainfall and humidity du...Leaf and fruit spot (Pseudocercospora angolensis) disease of citrus attacks leaves, fruits, and young twigs of the plant. The disease can cause a yield loss of (50% to 100%) in areas with high rainfall and humidity during the active growth stages of the crop. Currently, citrus plantations in the south, south-west and north-west of Ethiopia are seriously affected by this disease. As a result, this study was proposed to study the effect of fungicides in controlling. And candidate fungicides were: Carbonchlor 50% SC only, Benline 50% WP only, Bellis 38% WG only, Carbonchlor 50% SC combined with Bellis 38% WG, Benline 50% WP combined with Carbonchlor 50% SC and Benline 50% WP combined with Matco 72% WP for effective management of citrus leaf and fruit spot (Pseudocercospra angolensis) disease. The study was carried out in 2021 cropping season. A Randomized Complete Block Design (RCBD) with three replications was the design applied. The result showed that the highest level of efficacy (90.46%) was produced by Bellis 38% WG fungicide followed by Carbonchlor 50% SC (86.50%), Bellis 38% WG + Carbonchlor 50% SC (82.00%), Carbonchlor 50% SC + Benline 50% WP (67.89%), Benline 50% WP (65.62%) and Matco 72% WP + Benline 50% WP (49.48%). Therefore, based on the outcome of the study application of Bellis 38% WG only followed by Carbonchlor 50% SC only, Carbonchlor 50% SC combined with Benline 50% WP, Bellis 38% WG combined with Carbonchlor 50% SC, Bellis 38% WG only, Benline 50% WP only and Matco 72% WP combined with Benline 50% WP were effective fungicides to be used for the control of leaf and fruit spot disease.展开更多
Citrus leaf and fruit spot incited by Pseudocercospora angolensis are one of the most serious production constraints of citrus production in North Western Ethiopia. Disease survey in 10 major citrus growing districts ...Citrus leaf and fruit spot incited by Pseudocercospora angolensis are one of the most serious production constraints of citrus production in North Western Ethiopia. Disease survey in 10 major citrus growing districts of North-Western Ethiopia was conducted, to indicate the importance of citrus leaf and fruit spot disease and its association with agro-ecological factors. The study was carried out during 2021 and 2022 cropping seasons. And in each cropping season based on availability, a total of 280 citrus trees (200 sweet oranges, 40 mandarins, and 40 lemons) in 20 orchards were randomly assessed. This study result showed that in most of the surveyed areas, leaf and fruit spot were the most prevalent and long-lasting disease of citrus. That is, among 10 studied districts in 8 of them (100%) disease prevalence, (87.25%) incidence and (24.43%) severity were computed. As a result, most citrus growers were practiced uprooting of their citrus trees and replacing them by other fruit crops (Mango and Avocado). Therefore, from the result of the present investigation to provide sustainable citrus fruit productivity and production in areas where citrus leaf and fruit spot disease is predominant and causes a devastating effect, integrated and sustainable citrus leaf and fruit spot disease management practices should be executed. Furthermore, in order to get full illustrates of the importance of the disease, it is useful to conduct related disease surveys in major citrus growing areas of the country.展开更多
文摘Leaf and fruit spot (Pseudocercospora angolensis) disease of citrus attacks leaves, fruits, and young twigs of the plant. The disease can cause a yield loss of (50% to 100%) in areas with high rainfall and humidity during the active growth stages of the crop. Currently, citrus plantations in the south, south-west and north-west of Ethiopia are seriously affected by this disease. As a result, this study was proposed to study the effect of fungicides in controlling. And candidate fungicides were: Carbonchlor 50% SC only, Benline 50% WP only, Bellis 38% WG only, Carbonchlor 50% SC combined with Bellis 38% WG, Benline 50% WP combined with Carbonchlor 50% SC and Benline 50% WP combined with Matco 72% WP for effective management of citrus leaf and fruit spot (Pseudocercospra angolensis) disease. The study was carried out in 2021 cropping season. A Randomized Complete Block Design (RCBD) with three replications was the design applied. The result showed that the highest level of efficacy (90.46%) was produced by Bellis 38% WG fungicide followed by Carbonchlor 50% SC (86.50%), Bellis 38% WG + Carbonchlor 50% SC (82.00%), Carbonchlor 50% SC + Benline 50% WP (67.89%), Benline 50% WP (65.62%) and Matco 72% WP + Benline 50% WP (49.48%). Therefore, based on the outcome of the study application of Bellis 38% WG only followed by Carbonchlor 50% SC only, Carbonchlor 50% SC combined with Benline 50% WP, Bellis 38% WG combined with Carbonchlor 50% SC, Bellis 38% WG only, Benline 50% WP only and Matco 72% WP combined with Benline 50% WP were effective fungicides to be used for the control of leaf and fruit spot disease.
文摘Citrus leaf and fruit spot incited by Pseudocercospora angolensis are one of the most serious production constraints of citrus production in North Western Ethiopia. Disease survey in 10 major citrus growing districts of North-Western Ethiopia was conducted, to indicate the importance of citrus leaf and fruit spot disease and its association with agro-ecological factors. The study was carried out during 2021 and 2022 cropping seasons. And in each cropping season based on availability, a total of 280 citrus trees (200 sweet oranges, 40 mandarins, and 40 lemons) in 20 orchards were randomly assessed. This study result showed that in most of the surveyed areas, leaf and fruit spot were the most prevalent and long-lasting disease of citrus. That is, among 10 studied districts in 8 of them (100%) disease prevalence, (87.25%) incidence and (24.43%) severity were computed. As a result, most citrus growers were practiced uprooting of their citrus trees and replacing them by other fruit crops (Mango and Avocado). Therefore, from the result of the present investigation to provide sustainable citrus fruit productivity and production in areas where citrus leaf and fruit spot disease is predominant and causes a devastating effect, integrated and sustainable citrus leaf and fruit spot disease management practices should be executed. Furthermore, in order to get full illustrates of the importance of the disease, it is useful to conduct related disease surveys in major citrus growing areas of the country.
