Transactions of Worth in Refugee–Host Relations

2020 ◽  
pp. 198-211
Author(s):  
Christopher Kyriakides ◽  
Arthur McLuhan ◽  
Karen Anderson ◽  
Lubna Bajjali
Keyword(s):  
Host Relations

scholarly journals SPECIFICITY AND HOST-RELATIONS IN THE TREMATODE GENUS ZOÖGONUS

1941 ◽  
Vol 81 (2) ◽  
pp. 205-214 ◽  
Author(s):  
HORACE W. STUNKARD
Keyword(s):  
Trematode Genus ◽  
Host Relations

A study of the host relations of Halictophagus pontifex Fox (Strepsiptera), a parasite of Cercopidae (Hem., Aphrophorinae), in Uganda

1970 ◽  
Vol 60 (1) ◽  
pp. 33-42 ◽  
Author(s):  
D. J. Greathead
Keyword(s):  
Regression Analysis ◽  
Life Cycle ◽  
Multiple Regression Analysis ◽  
Multiple Regression ◽  
Population Data ◽  
Body Cavity ◽  
The Body ◽  
Density Dependent ◽  
Grassland Site ◽  
Host Relations

The relations of the Strepsipterous parasite Halictophagus pontifex Fox to seven species of its Cercopid (Aphrophorinae) hosts were studied at a grassland site in Uganda. Dissections of weekly samples of the Cercopids collected by sweeping showed that the duration of the life-cycle of H. pontifex is 30–40 days. The parasite is found only in adult hosts which can support as many individuals (up to 7) in Poophilus costalis (Wlk.) as can develop in the space available in the body cavity. Both the maximum number of parasites per host and the rate of parasitism are related to the volume of the host. Parasitism arrests development of the ovaries of female hosts; they may reproduce after emergence of male parasites but not after exhaustion of females because of reinfection by triungulins. Graphical and regression analysis of the population data (no. individuals/1 000 sweeps) show that, for P. costalis, parasitism by H. pontifex is density dependent and the chief regulating factor. Rainfall 58–64 days before sampling also was correlated with P. costalis density, but multiple regression analysis showed it to be insignificant.

scholarly journals Orobanche lutea Baumg. (Orobanchaceae) in Poland: revised distribution, taxonomy, phytocoenological and host relations

2014 ◽  
Vol 34 (1) ◽  
pp. 17-39 ◽  
Author(s):  
Renata Piwowarczyk ◽  
Łukasz Krajewski
Keyword(s):  
Heavy Metals ◽  
Current Distribution ◽  
Toxic Heavy Metals ◽  
Field Investigations ◽  
Critical Revision ◽  
Host Relations

Abstract The paper presents current distribution of Orobanche lutea Baumg. in Poland based on a critical revision of herbarium and literature data as well as results of field investigations conducted between 1999-2014. Majority of localities are centred around the Silesia-Cracow, Małopolska and Lublin-Lviv Uplands. The greatest density of sites with probably the most abundant populations in Europe is in the central part of Silesia-Cracow Upland, which, by several hundred years, was heavily exploited for calamine mining (rich in zinc, lead and silver). This resulted in the formation of large areas of gangue containing toxic heavy metals. Since limestone, dolomite, marl and postglacial calcareous clay and sands occur there in most places, the soil is often strongly calcareous. Populations of O. lutea contain here many thousands of shoots. The distribution of the species in Poland is mapped. The taxonomy, biology, ecology and threats are also discussed.

Host Relations in Species of Diplodia and Similar Genera

Mycologia ◽  
1941 ◽  
Vol 33 (1) ◽  
pp. 69-73 ◽  
Author(s):  
Neil E. Stevens
Keyword(s):  
Host Relations

The Ecology of Northern Australian Dacinae (Diptera:Tephritidae) I. Host Phenology and Utilization of Opilia amentacea Roxb. (Opiliaceae) by Dacus (Bactrocera) opiliae Drew & Hardy, with notes on some other species.

1981 ◽  
Vol 29 (5) ◽  
pp. 691 ◽  
Author(s):  
GP Fitt
Keyword(s):  
Western Australia ◽  
Natural Populations ◽  
Fruit Fly ◽  
Northern Territory ◽  
Coastal Areas ◽  
Oriental Fruit Fly ◽  
Short Period ◽  
Host Phenology ◽  
Fruit Growing ◽  
Host Relations

A newly discovered species of tephritid, Dacus (Bactrocera) opiliae Drew & Hardy, is almost indistinguishable morphologically from the Oriental fruit fly, Dacus dorsalis. and was originally believed to represent an invading population of that species. Breeding by D. opiliae is virtually restricted to the fruit of the native vine Opilia amentacea throughout coastal areas of the Northern Territory and the Kimberleys region of Western Australia. The phenology of the host and aspects of its utilization by D. opiliae are described. Fruit suitable for oviposition is available only for a short period each year from late November to early January. It is shown that D, opiliae is effectively univoltine. Although it was able to infest various cultivated fruits in the laboratory, no evidence of such infestations by natural populations of D. opiliae was recorded during this study and the species seem to present no threat to Australia's fruit-growing industries. Information on host relations of D. jarvisi (Tryon), D. aquilonis (May) and D. tenuifascia (May) is also presented.

The Host Relations of Our Cherry Fruit Flies

1933 ◽  
Vol 26 (2) ◽  
pp. 431-438 ◽  
Author(s):  
Hugh Glasgow
Keyword(s):  
Fruit Flies ◽  
Host Relations

scholarly journals Identification and Host Relations of Turnip ringspot virus, A Novel Comovirus from Ohio

Plant Disease ◽  
2007 ◽  
Vol 91 (10) ◽  
pp. 1212-1220 ◽  
Author(s):  
P. Rajakaruna ◽  
S. Khandekar ◽  
T. Meulia ◽  
S. M. Leisner
Keyword(s):  
Genomic Sequence ◽  
Microscopic Analysis ◽  
Unknown Origin ◽  
Ringspot Virus ◽  
Rt Pcr ◽  
Electron Microscopic ◽  
Polymerase Chain ◽  
Line Patterns ◽  
Ring Spot ◽  
Host Relations

Viruslike chlorotic ring spot symptoms and line patterns of unknown origin were observed on a greenhouse-grown turnip plant. The suspected virus was mechanically transmissible to plants in the Brassicaceae. Electron microscopic analysis revealed icosahedral particles approximately 28 nm in diameter. Reverse transcriptase–polymerase chain reaction (RT-PCR) analyses suggested that the pathogen is a comovirus, an observation that was confirmed by analysis of portions of the genomic sequence. This virus was provisionally named Turnip ringspot virus (TuRSV). Based on the RNA 1 sequence, TuRSV is most similar to Radish mosaic virus, another pathogen that infects members of the Brassicaceae. Arabidopsis thaliana is susceptible to TuRSV, and 12 out of the 23 ecotypes studied showed symptoms when inoculated with the virus. TuRSV induced a variety of responses on ecotypes from death to no infection. Some ecotypes showed one or two rounds of symptom display followed by recovery when inoculated with TuRSV. About half of the ecotypes (11/23) analyzed showed no symptoms when inoculated with TuRSV. Col-0 plants showed no symptoms, and infectious virus was not recovered from systemic leaves, although it could be detected by RT-PCR. Col-0 plants harboring mutations impairing the ethylene, jasmonic acid, or salicylic acid signaling pathways did not show symptoms when inoculated with TuRSV.

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