Rastrococus invadens was the only reported mealybug species on the mango tree in Western Burkina Faso. This study aimed at carrying out the inventory and showing the importance and distribution of other mealybug speci...Rastrococus invadens was the only reported mealybug species on the mango tree in Western Burkina Faso. This study aimed at carrying out the inventory and showing the importance and distribution of other mealybug species associated with the mango tree. It was also important to determine the periods of abundance of these species vis-a-vis R. invadens. For this purpose, the density of mealybugs was assessed in three study sites (Toussiana, Bérégadougou and Orodara) in Western Burkina Faso. The observations were made from June 2014 to June 2015 at a frequency of 15 ± 1 days. They focused on 20 leaves (5 leaves/cardinal point) levied on each mango tree. The species identified as Ferrisia virgata Cockerell and Icerya aegyptiaca Douglas were collected from mangos infested by R. invadens representing 98% - 99% of the density of the observed mealybug species. The periods of abundance of F. virgata and I. aegyptiaca were respectively the dry season and the rainy season. The effect of temperature, relative humidity and rainfall on the populations of F. virgata and I. aegyptiaca was also discussed. These results highlight the distribution range of F. virgata and I. aegyptiaca worldwide including Burkina Faso. R. invadens was the main mealybug species on mango in Burkina Faso in general and in the Western region of the country in particular.展开更多
Ferrisia virgata （Cockerell） is a post with wide distribution and broad range of host plants, but apparently it has not yet known to be an important post in China. Survey on pests of longan （Dimocarpus longgana Lou...Ferrisia virgata （Cockerell） is a post with wide distribution and broad range of host plants, but apparently it has not yet known to be an important post in China. Survey on pests of longan （Dimocarpus longgana Lour. ） in Zhangjiang of Guangdong Province in 2011 found that F. virgata had caused serious damage on production of longan. The paper first reported damage status of F. virgata on longan and also preliminarily introduced field identification characterlstics and host plants of F. virgata reported.展开更多
Introduction:A fundamental challenge to the integrity of tropical dry forest ecosystems is the invasion of nonnative grass species.These grasses compete for resources and fuel anthropogenic wildfires.In 2012,a bulldo...Introduction:A fundamental challenge to the integrity of tropical dry forest ecosystems is the invasion of nonnative grass species.These grasses compete for resources and fuel anthropogenic wildfires.In 2012,a bulldozer from the Puerto Rico Electric Power Authority cleared a 570-m trail from a state road into a mature dry forest section of Guánica Forest to control a wildfire.We monitored colonization by a non-native invasive grass(Megathyrsus maximus),a highly invasive tree(Leucaena leucocephala),and a native grass(Uniola virgata),as well as natural regeneration,along the bulldozer trail.We determined whether bulldozing facilitated colonization by these species into the forest and the extent of spread.Results:Distance from propagule source and temporal variations strongly influenced colonization by our three focal species.Megathyrsus maximus invaded along the trail from source populations by the state road.The establishment of new colonies of M.maximus seedlings went as far as 570 m inside the forest(i.e.,at the end of the bulldozer trail),but we found most new colonies within 270 m of the road.Leucaena leucocephala exhibited a similar spreading pattern.Before disturbance,Uniola virgata was distributed widely across the forest,but the highest densities were found in areas near the latter portion(>401 m)of the bulldozer trail.Subsequently,the species formed new clumps along more than half of the trail(250 to 570 m),apparently colonizing from undisturbed patches nearby.Conclusions:Bulldozing facilitated the invasion of non-native vegetation.The projected community assemblage will be more fire-prone than before since M.maximus carries fire across the landscape better than U.virgata,emphasizing the capacity of invasive plant colonization to alter local ecological processes after only a single wildfire and bulldoze event.Our results provide a valuable baseline for short-term vegetation response to anthropogenic disturbances in tropical semi-deciduous dry forests.展开更多
文摘Rastrococus invadens was the only reported mealybug species on the mango tree in Western Burkina Faso. This study aimed at carrying out the inventory and showing the importance and distribution of other mealybug species associated with the mango tree. It was also important to determine the periods of abundance of these species vis-a-vis R. invadens. For this purpose, the density of mealybugs was assessed in three study sites (Toussiana, Bérégadougou and Orodara) in Western Burkina Faso. The observations were made from June 2014 to June 2015 at a frequency of 15 ± 1 days. They focused on 20 leaves (5 leaves/cardinal point) levied on each mango tree. The species identified as Ferrisia virgata Cockerell and Icerya aegyptiaca Douglas were collected from mangos infested by R. invadens representing 98% - 99% of the density of the observed mealybug species. The periods of abundance of F. virgata and I. aegyptiaca were respectively the dry season and the rainy season. The effect of temperature, relative humidity and rainfall on the populations of F. virgata and I. aegyptiaca was also discussed. These results highlight the distribution range of F. virgata and I. aegyptiaca worldwide including Burkina Faso. R. invadens was the main mealybug species on mango in Burkina Faso in general and in the Western region of the country in particular.
基金Supported by Special Project for National Litchi and Longan Industrial Technology System (CARS-33)
文摘Ferrisia virgata （Cockerell） is a post with wide distribution and broad range of host plants, but apparently it has not yet known to be an important post in China. Survey on pests of longan （Dimocarpus longgana Lour. ） in Zhangjiang of Guangdong Province in 2011 found that F. virgata had caused serious damage on production of longan. The paper first reported damage status of F. virgata on longan and also preliminarily introduced field identification characterlstics and host plants of F. virgata reported.
文摘Introduction:A fundamental challenge to the integrity of tropical dry forest ecosystems is the invasion of nonnative grass species.These grasses compete for resources and fuel anthropogenic wildfires.In 2012,a bulldozer from the Puerto Rico Electric Power Authority cleared a 570-m trail from a state road into a mature dry forest section of Guánica Forest to control a wildfire.We monitored colonization by a non-native invasive grass(Megathyrsus maximus),a highly invasive tree(Leucaena leucocephala),and a native grass(Uniola virgata),as well as natural regeneration,along the bulldozer trail.We determined whether bulldozing facilitated colonization by these species into the forest and the extent of spread.Results:Distance from propagule source and temporal variations strongly influenced colonization by our three focal species.Megathyrsus maximus invaded along the trail from source populations by the state road.The establishment of new colonies of M.maximus seedlings went as far as 570 m inside the forest(i.e.,at the end of the bulldozer trail),but we found most new colonies within 270 m of the road.Leucaena leucocephala exhibited a similar spreading pattern.Before disturbance,Uniola virgata was distributed widely across the forest,but the highest densities were found in areas near the latter portion(>401 m)of the bulldozer trail.Subsequently,the species formed new clumps along more than half of the trail(250 to 570 m),apparently colonizing from undisturbed patches nearby.Conclusions:Bulldozing facilitated the invasion of non-native vegetation.The projected community assemblage will be more fire-prone than before since M.maximus carries fire across the landscape better than U.virgata,emphasizing the capacity of invasive plant colonization to alter local ecological processes after only a single wildfire and bulldoze event.Our results provide a valuable baseline for short-term vegetation response to anthropogenic disturbances in tropical semi-deciduous dry forests.
