Prevalence of Blackleg and Pathogenicity Groups of Leptosphaeria maculans in North Dakota.

Blackleg, caused by Leptosphaeria maculans, was first reported on canola (Brassica napus) in North Dakota in 1991. In 2003, L. maculans strains of previously unreported pathogenicity groups (PG) were discovered in the region. Since then, however, little has been known about the prevalence of L. maculans in the state. The objectives of this study, therefore, were to characterize the prevalence of blackleg and of L. maculans PGs in North Dakota. Prevalence was assessed in 2004, 2007, and 2009 in 572 fields. PG determination for 216 L. maculans isolates retrieved from blackleg symptomatic stems during that period was achieved on a set of B. napus differential cultivars. Blackleg prevalence increased from 28% in 2004 to 63 and 74% in 2007 and 2009, respectively. Similarly, the number of fields with blackleg incidences >30% increased from 4% in 2004 to 12 and 23% in 2007 and 2009, respectively. In all years, PG-4 was the predominant group, while PG-2, once predominant, accounted for <2% of isolates. Increase in the prevalence and incidence of blackleg as well as the frequency of virulent PGs over the last 10 years is a serious threat to the canola industry of the region.

Simulation and source identification of X-ray contrast media in the water cycle of Berlin.

This article describes the development of a model to simulate the fate of iodinated X-ray contrast media (XRC) in the water cycle of the German capital, Berlin. It also handles data uncertainties concerning the different amounts and sources of input for XRC via source densities in single districts for the XRC usage by inhabitants, hospitals, and radiologists. As well, different degradation rates for the behavior of the adsorbable organic iodine (AOI) were investigated in single water compartments. The introduced model consists of mass balances and includes, in addition to naturally branched bodies of water, the water distribution network between waterways and wastewater treatment plants, which are coupled to natural surface waters at numerous points. Scenarios were calculated according to the data uncertainties that were statistically evaluated to identify the scenario with the highest agreement among the provided measurement data. The simulation of X-ray contrast media in the water cycle of Berlin showed that medical institutions have to be considered as point sources for congested urban areas due to their high levels of X-ray contrast media emission. The calculations identified hospitals, represented by their capacity (number of hospital beds), as the most relevant point sources, while the inhabitants served as important diffusive sources. Deployed for almost inert substances like contrast media, the model can be used for qualitative statements and, therefore, as a decision-support tool.

Breast-feeding and population growth.

Abandonment of breast-feeding in parts of the world where contraception is not in common use may mean both higher birthrates and, especially among the poor, higher infant death rates. In this article estimates of the magnitude of these effects are made.

Comparative evaluation and economic potential of ecorational versus chemical insecticides for crucifer flea beetle (Coleoptera: Chrysomelidae) management in Canola.

From 2001 to 2004, field studies were conducted to evaluate the effect of the ecorational insecticides SpinTor (spinosad), BotaniGard (Beauveria bassiana), Neemix (azadirachtin), and Surround (kaolin) against crucifer flea beetle on canola, Brassica napus L., at the cotyledon stage. The ecorational treatments were compared with a standard foliar chemical insecticide, Capture (bifenthrin), and the chemical seed treatment insecticide Helix XTra (thiamethoxam). This study indicated that flea beetle injury was lower for Helix XTra, Capture, and the ecorational insecticide SpinTor. SpinTor was less effective when flea beetle populations were relatively high (200-300 per trap-week). Yields for chemical insecticide treatments were always greater than SpinTor, with differences being the smallest (68-374 kg/ha) at low levels of flea beetle feeding injury. Differences were greatest when canola seedling injury was high (775-1,364 kg/ha). Yield differences between the conventional insecticides and BotaniGard, Neemix, and Surround were 119-439 and 61-2,248 kg/ha at low and high flea beetle feeding injury, respectively. Although yield differences between SpinTor and chemical insecticides were relatively small at lower levels of flea beetle injury, net losses ranged from $47 to $151/ha when SpinTor was used as an alternative to a standard chemical seed treatment, Helix XTra. This suggests that SpinTor would not be a viable alternative to the chemical insecticide. Net losses ranged from $30 to $266/ha when BotaniGard, Neemix, and Surround were used as alternatives to the seed treatment.

Can prostitutes marry? Thai attitudes toward female sex workers.

This study explores popular attitudes towards female sex workers in Thailand by examining the general public's perceptions of a prostitute's ability to marry based on focus group data. The tentative conclusion emerging from our findings that the general public believes sex workers can marry is that a relative lack of severe or lasting social stigma is an important part of a Thai context that facilitates recruitment into prostitution and permits it to persist on a widespread scale. We interpret this conclusion in terms of the broader value system in Thai society. Although our findings are implicitly comparative in nature, a lack of comparable information from other countries on how those who provide commercial sex are viewed by the general population prevents a more definitive conclusion. There is an obvious need for research on this topic as well as on how sex workers view themselves, and how this translates into actual behavior. Data set used: focus group transcripts from the project "The influence of primary female partners and male peers on male extramarital sexual behavior in Thailand".

In the company of friends: peer influence on Thai male extramarital sex.

We explore some of the key social dynamics underlying patterns of male extramarital heterosexual behavior in Thailand. We analyze transcripts of focus group discussions and focused individual interviews conducted during 1993 and 1994 with married men and women living in both urban and rural areas of central Thailand. We discern several pathways of peer influence on extramarital commercial sex patronage that are common across our sites and interpret these peer effects in light of contemporary theories of social influence and sexual behavior.

Older people and AIDS: quantitative evidence of the impact in Thailand.

Discussions of the AIDS epidemic rarely consider the impact on older people except as infected persons. Virtually no systematic quantitative assessments exist of the involvement of parents or other older generation relatives in the living and caretaking arrangements of persons with AIDS in either the West or the developing world. We assess the extent of such types of involvement in Thailand, a country where substantial proportions of elderly parents depend on adult children for support and where co-residence with an adult child is common. Interviews with local key informants in the public health system in rural and urban communities provided quantitative information on a total of 963 adult cases who either had died of AIDS or were currently symptomatic. The results indicate that a substantial proportion of persons with AIDS move back to their communities of origin at some stage of the illness. Two-thirds of the adults who died of an AIDS-related disease either lived with or adjacent to a parent by the terminal stage of illness and a parent, usually the mother, acted as a main caregiver for about half. For 70%, either a parent or other older generation relative provided at least some care. The vast majority of the parents were aged 50 or more and many were aged 60 or older. This extent of older generation involvement appears to be far greater than in Western countries such as the US. We interpret the difference as reflecting the contrasting epidemiological and socio-cultural situations in Thailand and the West. The fact that older people in Thailand, and probably many other developing countries, are extensively impacted by the AIDS epidemic through their involvement with their infected adult children has important implications for public health programs that address caretaker education and social and economic support.

Europe's fertility transition: new evidence and lessons for today's developing world.

PIP: Statistics of population dynamics in pre-fertility transition Europe, especially Western Europe, are diagrammed, tabulated, and graphed. A description of new sources of information, refined concepts on Europe's fertility transition, and ways of measuring the actual practice of family limitation are explained. New findings in the field indicate that the past was largely characterized by natural fertility. Factors such as the period of lactation and seasonal migration influenced total fertility differences. The transition from high to low fertility and mortality represented a shift from natural fertility to family limitation. Differences in the start and speed of the fertility decline are determined more by cultural than by socioeconomic conditions. This process began in Western Europe, under varying socioeconomic conditions, during the 1880-1910 period and was irreversible once it started. It is generally agreed that many areas of the developing world are currently undergoing a fertility transition. Both birth and death rates in these countries are higher than levels ever were in pre-transition Europe. However, the new findings relating to the transition in Europe lead experts to believe that this curent transition will follow the same courese. A certain level of socioeconomic development is not a precondition. Family planning programs, even in underdeveloped areas, can be effective.^ieng

Distribution and Severity of Pasmo on Flax in North Dakota and Evaluation of Fungicides and Cultivars for Management.

Pasmo, caused by Septoria linicola, reduces flax (Linum usitatissimum) yield in the Canadian provinces of Manitoba and Saskatchewan, but little is known about its distribution and effect on yield in North Dakota. Field surveys for pasmo were conducted in 74 and 87 flax fields across 19 and 23 North Dakota counties in 2002 and 2003, respectively. The surveys indicated that pasmo was present in 17 and 18 counties in 2002 and 2003, respectively. County mean plant incidences ranged from 0 to 21% and 0 to 84.5% in 2002 and 2003, respectively. County mean pasmo severity ranged from 0 to 38.8% and 0 to 29.3% in 2002 and 2003, respectively. Significant (P ≤ 0.07) positive Pearson correlations were detected between total rainfall accumulated for June to August and pasmo severity in 2002 and 2003 and for rainfall and pasmo incidence in 2003. Field trials were conducted to determine the effect of fungicides and flax cultivars on pasmo severity and flax yield. Pasmo severity was significantly (P ≤ 0.05) reduced with azoxystrobin and sulfur fungicides compared with the untreated control. Flax yields were significantly (P ≤ 0.05) greater in azoxystrobin- and prothioconazole-treated plots than in the untreated control plots. Cv. Omega had significantly lower pasmo severity than the other three cultivars, but cv. Rahab 94 had the greatest yield of all the cultivars. Based on the results presented, pasmo is an important disease of flax in North Dakota, and its distribution is widespread throughout the flax-production region. Fungicides such as azoxystrobin and prothioconazole appear to be excellent potential tools for pasmo management.

Introduction.

This special issue of theJournal of Cross-Cultural Gerontology contains a series of articles on the living arrangements of the elderly in four Asian countries (the Philippines, Singapore, Taiwan, and Thailand) as revealed in qualitative data provided by focus group discussions. These four countries are characterized by a mix of similarities and differences that makes comparison between them especially interesting. Focus group methodology, as discussed in detail in the following separate article, is a promising approach for research in social gerontology.

Focus groups as a qualitative method for crosscultural research in social gerontology.

The focus group approach for collecting qualitative data can be usefully applied in social gerontological studies, both in a single setting and cross-culturally. The experiences of the research terms participating in the Comparative Study of Asian Elderly in employing focus groups are described, and their advantages and disadvantages as a general method for gathering basic qualitative data are discussed. While the method has promise, it also should be recognized that conducting focus group research within the context of a comparative study compounds the considerable time, effort, and funds that focus group research for basic social science already requires.

Thailand's reproductive revolution.

PIP: Thailand has achieved a remarkable population revolution in the past 15 years, resulting in a fertility decline of 44%, the 3rd greatest decline of the major developing countries. Thailand is quite distinct from either China or South Korea, the leaders in fertility decline. It has neither China's authoritarian power system to enforce population control nor the highly developed, Westernized outlook of South Korea. Instead it achieved its astounding fertility drop through a noncoercive family planning program operating within a context of rapid social change and a cultural setting. Thailand's drop in population growth has touched almost all segments of Thai society. The preferred number of children among couples married less than 5 years has dropped in both rural and urban families at almost exactly the same rate, from about 3.2 in 1969 to 2.3 in 1984. Religious groups represent the only substantial difference in family size preference; Moslem women married less than 5 years stated a desired average of 3.1 children versus 2.3 for Buddhist women. The direct case of the fertility drop is a national increase in contraceptive use. In 1984, 65% of Thai women reported using contraception. The Thai population, however, was ripe for using contraception when it became available due to 1) mass media creating a desire for consumer goods, 2) the increased costs of education to parents, 3) the willingness of parents to trade off "parent repayment" from many children for a few quality children, 4) couples' autonomy in fertility decision making, 5) the high status of women in Thailand, and 6) the fact that Buddhism poses no barriers to contraception. Current trends show no immediate sign of change.^ieng

Starting, stopping, and spacing during the early stages of fertility transition: the experience of German village populations in the 18th and 19th centuries.

Examination of the reproductive histories of a sample of German married couples during the 18th and 19th centuries provides insights into behavioral changes involved in the shift from natural fertility to deliberate marital fertility control. A simple accounting scheme is used to assess the relative contributions of starting, spacing, and stopping to changes in family size during the initial phases of the fertility transition. The results suggest that in rural Germany, attempts to terminate childbearing prior to the end of the reproductive span were far more important in initiating the onset of fertility transition than efforts to deliberately prolong intervals between births or changes in the timing of the start of childbearing.

Child mortality and reproductive behaviour in German village populations in the past: A micro-level analysis of the replacement effect.

Abstract Reproductive histories of couples married during the eighteenth and nineteenth centuries in a sample of 14 German villages are analysed in order to answer several questions regarding the relationship between child mortality and reproductive behaviour. An effort is made through selection of cases and use of multiple classification analysis to eliminate or control non-volitional or otherwise confounding influences on the relationship between a couple's experience with child mortality and their fertility. The results do not provide a decisive answer to the question of whether, under a regime of otherwise presumed natural fertility, previous experience of child mortality affected subsequent reproductive behaviour. The evidence was much clearer in indicating that behaviour consistent with replacement efforts emerged or strengthened as family limitation spread. Finally, the results indicated that though it was not necessary for overall child mortality to decline before family limitation practices were adopted, couples with the most favourable child mortality experience were most likely to practise family limitation and to reduce their fertility. Child mortality appeared at least to impede, if not totally prevent, efforts to reduce the number of children ever born or to cease childbearing at an earlier age or at a given parity.

Law, marriage and illegitimacy in nineteenth-century Germany.

Abstract Concern arose among legislators in several German States during the first half of the nineteenth century about overpopulation and increasing numbers of the impoverished classes. This led them to pass legislation restricting marriage to those considered by the community authorities as morally and financially capable of rearing a family. Census data at the time of the repeal of these laws indicate the extent to which they succeeded in repressing marriage. Declining illegitimacy which paralleled the repeal, however, suggests strongly that the legislation was far less effectual in limiting reproduction than it was in preventing marriage. Added confirmation of this interpretation is provided by the contrasting nuptiality and illegitimacy patterns of German states with liberal marriage regulations.

Infant mortality and fertility in three Bavarian villages: An analysis of family histories from the 19th century.

Abstract Family history data derived from the records of three parishes in Bavaria provide evidence for several important demographic questions when analysed in conjunction with information concerning the prevalent breast-feeding practices. The results suggest strongly that breast feeding can prolong birth intervals substantially. The evidence concerning the independent influence of infant deaths on subsequent birth intervals is inconclusive. It is clear, however, that even if such an influence did exist it was relatively small, compared to the effect of lactation. In addition the results do not lend support to the hypothesis that couples experiencing low child mortality practised family limitation more than couples experiencing high child mortality. In all three parishes, however, fertility appeared to influence infant mortality. Infants born after short intervals were subject to considerably higher mortality risks than infants following longer intervals.

From natural fertility to family limitation: the onset of fertility transition in a sample of German villages.

Utilizing data from a sample of German village genealogies, it is possible to document the changes in reproductive patterns on the family level that started to take place in Germany during the nineteenth century and formed the basis for the secular decline in fertility which eventually encompassed the entire country. One striking finding from this study was the substantial diversity among the small sample of villages in terms of the timing of the emergence of family limitation. While couples in all villages who married during the last half of the eighteenth century appeared to be characterized predominantly by natural fertility the emergence of family limitation began as early as the turn of the nineteenth century in some places and as late as the end of the nineteenth century in others. Occupational differentials with respect to family limitation were also examined. There is little evidence that changes in birth spacing played an important part in the initial phase of the fertility trnsition. Rather, the underlying process appears to involve a change from fertility patterns that were characterized by the absence of parity-dependent control to one in which attempts to terminate childbearing in response to the number of children already born becomes widespread.

[Not Available]. / Espacement des naissances et planification familiale: une critique de la méthode Dupâquier-Lachiver.

PIP: The author presents a critique of Dupaquier and Lachiver's technique for detecting the historical practice of birth control by analyzing family reconstitution data. Problems with the method, which focuses on birth intervals rather than "stopping" behavior, are illustrated using data from several German village populations in the eighteenth and nineteenth centuries (SUMMARY IN ENG)^ieng

Two and a half centuries of demographic history in a Bavarian village.

Abstract A village genealogy containing family histories of couples married between 1692 and 1939 serves as the basis for a study of the demographic history of a Bavarian village. The past patterns of marriage, re-marriage, widowhood, illegitimacy, bridal pregnancy, marital fertility, family size, and birth intervals are examined. Both the age at marriage and illegitimacy increased and then declined during the nineteenth century, apparently in response to changes in restrictive marriage legislation. Differences in fertility for occupational groups were insignificant. Marital fertility remained extremely high before 1900 suggesting the absence of any substantial family limitation within marriage. A rise in marital fertility that occurred during the last half of the nineteenth century appears to result from a change in breast-feeding customs. The actual number of children surviving to maturity for most couples was kept quite low, however, through late marriage and high infant mortality. Only during the twentieth century are substantial declines in infant mortality and fertility evident.