Topic
Infestation
About: Infestation is a research topic. Over the lifetime, 8308 publications have been published within this topic receiving 82305 citations.
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TL;DR: In this article, the authors quantify the dynamics of standing tree infestation patterns from two infestation sources: windthrow and previous-year beetle infestations, and find that the forest within 100m from the active infestation compared to more distant buffers had the highest risk of infestation.
26 citations
TL;DR: Pest infestation-crop loss relationships indicated that the accumulated foliar injury up to the growth stages of flowering and berry formation produced the highest yield losses in the different potato varieties.
26 citations
TL;DR: Time series analyses show adult population of B. dorsalis increased 2 months after an increase in mean temperature in all sites, 4 months after rainfall in natural and interface sites, and 1 month and 3 months after fruit infestation in commercial and natural and interfaces sites, respectively.
Abstract: The highly invasive oriental fruit fly, Bactrocera dorsalis (Hendel), has been declared present in the northern parts of South Africa since 2013. A study was thus initiated in July 2014 to determine the host range and field population of the pest species in the region. Fruit were collected from commercial fruit production, interface (smaller commercial blocks surrounded by natural savannah vegetation) and natural areas (savannah vegetation) throughout Limpopo and Mpumalanga provinces, South Africa. Field sites consisted of five commercial fruit production sites, two interface sites and two natural areas. Fruit samples from the tree and the ground were collected and incubated separately to determine infesting fruit fly species and the degree of infestation. Adult B. dorsalis populations were monitored at each field site using three methyl eugenol-baited bucket traps to estimate population pressure and to determine with the use of time series analysis if monthly trap captures were correlated with fruit infestation. Bactrocera dorsalis was reared from seven plant species: two from commercial orchards (Mangifera indica cv. [Tommy Atkins, Sensation], Citrus sinensis cv. [Valencia]), and five from other plant species (Psidium guajava, Anacardium occidentale, Solanum mauritianum, Xylotheca kraussiana, Vangueria infausta). Fruit utilized by B. dorsalis was also infested or damaged by other species, which may indicate opportunism by the pest, and the potential for competitive interactions. Time series analyses show adult population increased 2 months after an increase in mean temperature in all sites, 4 months after rainfall in natural and interface sites, and 1 month and 3 months after fruit infestation in commercial and natural and interface sites, respectively. This study shows B. dorsalis utilizing a limited range of hosts in South Africa. However, the host range of B. dorsalis may expand as it may not yet have encountered all potential hosts.
26 citations
TL;DR: Eelgrass-leaf dynamics and ‘wasting disease’ symptoms were compared in three meadows of the Brittany shoreline; the agent responsible for these symptoms, Labyrinthula zosterae, was present in these three sites; its infestation was highly correlated with leaf-age.
26 citations
TL;DR: Though the numbers of ewes studied were somewhat limited, the results were consistent and indicate that at least three different factors influence the degree of stomach-worm infestation.
Abstract: Faecal examination for Trichostrongyle eggs of ewes of known ages sired by two different rams were made weekly over a period of two months from September to November 1937. All data on the egg counts were quantitative. Though the numbers of ewes studied were somewhat limited, the results were consistent and indicate that at least three different factors influence the degree of stomach-worm infestation. The season of the year is the first variable. Age of the ewe is the second, although, in these data, age beyond 2 years 8 months ceased to be important. The third and most important variable influencing stomach-worm infestation is genetic constitution for resistance and susceptibility. Judging from these results, genetic selection should effectively change the degree of resistance or susceptibility in populations of sheep.
26 citations