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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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Journal ArticleDOI
TL;DR: It is recommended that a maximum infestation level in shipped fruit be set (as an acceptable risk limit) and that this infestationlevel be used as the criterion for quarantined fruit.
Abstract: Problems with the use of a probit 9 mortality rate as a criterion for quarantine disinfestation treatments for fruit flies (Diptera; Tephritidae) are discussed. We recommend that a maximum infestation level in shipped fruit be set (as an acceptable risk limit) and that this infestation level be used as the criterion for quarantined fruit. The infestation level should be set based on calculations of the probability of a mating pair surviving a shipment.

67 citations

Journal ArticleDOI
TL;DR: An intensive population census of Bactrocera latifrons (Hendel) identified 15 species of suitable host plants (11 solanaceous, 4 cucurbitaceous), 6 of them new host records, and B. latifron populations decreased as the elevation increased, and there was no discernible pattern of population fluctuation over time.
Abstract: An intensive population census of Bactrocera latifrons (Hendel) identified 15 species of suitable host plants (11 solanaceous, 4 cucurbitaceous), 6 of them new host records. Lycopersicon pimpinellifolium (Jusl.) Mill., Solanum nigrescens Mart. & Galeotti, Solatium sodomeum L., and Solanum torvum Sw. were the most heavily infested host plants in feral habitats. Under backyard and commercial cultivations, Capsicum annuum L., Lycopersicon lycopersicum (L.) Karst. ex Farw., and Solanum melongena L. were the most heavily infested (larval density and percentage infestation). B. latifrons appears to outcompete melon fly, oriental fruit fly, and Mediterranean fruit fly in C. annuum, Capsicum frutescens L., L. pimpinellifolium, Physalis peruviana L., S. melongena, S. nigrescens, S. nigrum, S. sodomeum , and S. torvum . Extremely low (<1%) larval parasitization by Diachasmimorpha longicaudata (Ashmead) was observed. Larval parasitization by Tetrastichus sp. was also observed. More than 250 cm average annual cumulative rainfall probably excluded B. latifrons populations from areas where suitable host plants were abundant. Over the study period, the relative abundance of B. latifrons populations decreased as the elevation increased. B. latifrons population density levels were consistently low, and there was no discernible pattern of population fluctuation over time (months of collection). Comprehensive lists of all recorded host plants (world review) and natural enemies of B. latifrons are presented. The ecological attributes of B. latifrons populations and their adaptive significance in colonizing and establishing in new geographic areas are discussed.

67 citations

Journal ArticleDOI
TL;DR: From the data resulting from the examination of almost nine thousand specimens of Nassa obsoleta Say it seems clear that there is a semi-annual rise and fall in the larval trematode infestation, and migrations of the definitive hosts and the degree of their infestation affect the seasonal fluctuations.
Abstract: From the data resulting from the examination of almost nine thousand specimens of Nassa obsoleta Say it seems clear that there is a semi-annual rise and fall in the larval trematode infestation. In view of the fact that none of the adults of these larvae are known it is difficult to explain these phenomena. In all probability migrations of the definitive hosts, and the degree of their infestation, affect the seasonal fluctuations; and other factors are probably the life span of Nassa, and the effect of parasitism upon it. The relative importance of these factors is not clear.

67 citations

MonographDOI
01 Jan 1991
TL;DR: The large proportion of uninjured Douglas-fir that was infested by Douglas-rv beetle in 1990 suggests infestation will increase in unburned portions of the GYA, and a rve-injury model correctly predicted death for one-half of the Douglasfir and two-thirds of the lodgepole pine, but all of the Engelmann spruce and subalpine fir.
Abstract: Gene D. Amman1 Kevin c. Ryan2 Permanent plots were established in the Greater Yellowstone Area (GYA) following the 1988 fires to determine response of bark beetles to fire-injured conifers. Within 2 years (1989 and 1990), 67 percent of the Douglas-rv had been infested by bark beetles (primarily the Douglas-fir beetle) and wood borers; 44 percent of the lodgepole pine were infested (primarily by the pine engraver); 82 percent of the Engelmann spruce were infested (mostly by spruce beetle); and 71 percent of the subalpine fir were infested (mostly by wood borers). Bark beetle infestation usually occurred in trees having 50 percent or more basal girdling by fire. However, uninjured Douglasfir also had 46 percent of the trees infested in 1990. The large proportion of uninjured Douglas-fir that was infested by Douglas-rv beetle in 1990 suggests infestation will increase in unburned portions of the GYA Of the trees that died, a rve-injury model correctly predicted death for one-half of the Douglasfir and two-thirds of the lodgepole pine, but all of the Engelmann spruce and subalpine fir.

67 citations

Journal ArticleDOI
TL;DR: The wheat midge Sitodiplosis mosellana (Gehin) occurred in all wheat-growing areas of Manitoba during 1993-1997, with 95% of spring wheat fields having some seeds infested by larvae as discussed by the authors.
Abstract: The wheat midge Sitodiplosis mosellana (Gehin) occurred in all wheat-growing areas of Manitoba during 1993–1997, with 95% of spring wheat fields having some seeds infested by larvae. The level of infestation varied, but each year in excess of 20% of seeds were infested in some fields. Infestation levels in adjacent fields were more similar than in fields separated by a few kilometres. Within fields, the infestation was similar at the edge and near the centre. Wheat midge larvae also overwintered in, and adults emerged from, fields in all wheat-growing areas of Manitoba. Adults emerged from the end of June to the end of July most years, and the peak period for adult flight was mid-July, about 1 month later than in parts of Europe where winter wheat predominates. The timing of the emergence was similar from place to place and year to year. Females constituted 95% of insects caught in a flight trap. The first 10% and 50% of the flight occurred on 9 and 16 July, respectively, and the timing of the flight was not related to growing degree-days. In early August, mature larvae began dropping from wheat heads. The timing of infestation of spring wheat was variable among years because of differences in timing between midge flights and the susceptible heading stage of the crop. Nevertheless, the wheat midge flight usually coincided with the susceptible stage of the spring wheat crop.

67 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20241
2023602
20221,428
2021276
2020344
2019294