Do the plant host origins of Helicoverpa (Lepidoptera: Noctuidae) moth populations reflect the agricultural landscapes within which they are caught?

The use of Bt cotton varieties has greatly reduced the amount of conventional insecticides required to control lepidopteran pests, Helicoverpa armigera and Helicoverpa punctigera, in Australia, but the possibility that these moths might become resistant to Bt remains a threat. Consequently, a Resistance Management Plan, which includes the mandatory growing of refuge crops (pigeon pea and non-Bt cotton; both C3 plants), has been established for Bt cotton farmers. However, knowledge of the relative contributions made to overall moth populations from the many host origins (both C3 and C4 plants) available to these insects throughout cotton production regions remains limited, as do the scales of movement and spatial mixing of moths within and between these areas. This study used stable isotope signatures (in particular δ13C) to help identify where moths fed as larvae within separate cotton production regions which differed in their proportions of C3 and C4 host crops (e.g. cotton and sorghum, respectively). C3-derived moths predominated in the early season, but C4-derived moths increased in frequency later. The overall proportion of C4 moths was higher in H. armigera than in H. punctigera. Whilst the relative proportions of C3 and C4 moths differed between regions, no differences in such proportiorns were found at smaller spatial scales, nor were there significant correlations between crop composition and isotope signatures in moths. Overall, these results suggest that C4 host plants are likely to be very important in offsetting the development of Bt resistance in these insects and such influences may operate across multiple regions within a single growing season.

Broad-scale suppression of cotton bollworm, Helicoverpa armigera (Lepidoptera: Noctuidae), associated with Bt cotton crops in Northern New South Wales, Australia.

The cotton bollworm, Helicoverpa armigera, is a major pest of many agricultural crops in several countries, including Australia. Transgenic cotton, expressing a single Bt toxin, was first used in the 1990s to control H. armigera and other lepidopteran pests. Landscape scale or greater pest suppression has been reported in some countries using this technology. However, a long-term, broad-scale pheromone trapping program for H. armigera in a mixed cropping region in eastern Australia caught more moths during the deployment of single Bt toxin cotton (Ingard®) (1996-2004) than in previous years. This response can be attributed, at least in part, to (1) a precautionary cap (30% of total cotton grown, by area) being applied to Ingard® to restrict the development of Bt resistance in the pest, and (2) during the Ingard® era, cotton production greatly increased (as did that of another host plant, sorghum) and H. armigera (in particular the 3rd and older generations) responded in concert with this increase in host plant availability. However, with the replacement of Ingard® with Bollgard II® cotton (containing two different Bt toxins) in 2005, and recovery of the cotton industry from prevailing drought, H. armigera failed to track increased host-plant supply and moth numbers decreased. Greater toxicity of the two gene product, introduction of no cap on Bt cotton proportion, and an increase in natural enemy abundance are suggested as the most likely mechanisms responsible for the suppression observed.

Long-term changes in the numbers of Helicoverpa punctigera (Lepidoptera: Noctuidae) in a cotton production landscape in northern New South Wales, Australia.

Two noctuid moths, Helicoverpa punctigera and Helicoverpa armigera, are pests of several agricultural crops in Australia, most notably cotton. Cotton is a summer crop, grown predominantly in eastern Australia. The use of transgenic (Bt) cotton has reduced the damage caused by Helicoverpa spp., but the development of Bt resistance in these insects remains a threat. In the past, large populations of H. punctigera have built up in inland Australia, following autumn-winter rains. Moths have then migrated to the cropping regions in spring, when their inland host plants dried off. To determine if there have been any long-term changes in this pattern, pheromone traps were set for H. punctigera throughout a cropping landscape in northern New South Wales from 1992 to 2015. At least three generations of moths were caught from spring to autumn. The 1st generation (mostly spring migrants) was the most numerous. Trap captures varied between sites and decreased in time, especially for moths in the 1st generation. Nearby habitat type influenced the size of catch and there was some evidence that local weather also influenced the numbers of moths caught. There was no correlation between trap catches in the cropping region and rainfall in the inland. In addition, there was little evidence that Bt cotton has reduced the abundance of H. punctigera at landscape scale. The apparent decline in the number of presumably Bt susceptible moths arriving each spring in the cropping regions from inland habitats is of concern in relation to the management of Bt resistance.

Mating of Helicoverpa armigera (Lepidoptera: Noctuidae) moths and their host plant origins as larvae within Australian cotton farming systems.

Transgenic (Bt) cotton dominates Australian cotton production systems. It is grown to control feeding damage by lepidopteran pests such as Helicoverpa armigera. The possibility that these moths might become resistant to Bt remains a threat. Consequently, refuge crops (with no Bt) must be grown with Bt cotton to produce large numbers of Bt-susceptible moths to reduce the risk of resistance developing. A key assumption of the refuge strategy, that moths from different host plant origins mate at random, remains untested. During the period of the study reported here, refuge crops included pigeon pea, conventional cotton (C3 plants), sorghum or maize (C4 plants). To identify the relative contributions made by these (and perhaps other) C3 and C4 plants to populations of H. armigera in cotton landscapes, we measured stable carbon isotopes (δ(13)C) within individual moths captured in the field. Overall, 53% of the moths were of C4 origin. In addition, we demonstrated, by comparing the stable isotope signatures of mating pairs of moths, that mating is indeed random amongst moths of different plant origins (i.e. C3 and C4). Stable nitrogen isotope signatures (δ(15)N) were recorded to further discriminate amongst host plant origins (e.g. legumes from non-legumes), but such measurements proved generally unsuitable. Since 2010, maize and sorghum are no longer used as dedicated refuges in Australia. However, these plants remain very common crops in cotton production regions, so their roles as 'unstructured' refuges seem likely to be significant.

A tale of two trapping methods: Helicoverpa spp. (Lepidoptera, Noctuidae) in pheromone and light traps in Australian cotton production systems.

Pheromone and light traps have often been used in ecological studies of two major noctuid pests of agriculture in Australia, Helicoverpa armigera and H. punctigera. However, results from these two methods have rarely been compared directly. We set pheromone and light traps adjacent to or amongst cotton and various other crops for 10-11 years in the Namoi Valley, in northern New South Wales, Australia. Catches in pheromone traps suggested a major peak in (male) numbers of H. punctigera in early spring, with relatively few moths caught later in the summer cropping season. In contrast, (male) H. armigera were most abundant in late summer. Similar trends were apparent for catches of both male and female H. armigera in light traps, but both sexes of H. punctigera were mostly caught in mid-summer. For both species, males were more commonly caught than females. These catch patterns differed from some previous reports. At least three generations of both species were apparent in the catches. There was some evidence that the abundance of later generations could be predicted from the size of earlier generations; but, unlike previous authors, we found no positive relationships between local winter rainfall and subsequent catches of moths, nor did we find persuasive evidence of correlations between autumn and winter rainfall in central Australia and the abundance of subsequent 1st generation H. punctigera moths. Female H. punctigera were consistently more mature (gravid) and more frequently mated than those of H. armigera. Overall, our results highlight the variability in trap catches of these two species and question the use of trap catches and weather as predictors of future abundance in cropping regions.

Transseptal left heart catheterization for a patient with a prosthetic mitral valve using live three-dimensional transesophageal echocardiography.

The images and videos presented in this article illustrate a diagnostic transseptal left heart catheterization for a patient with a prosthetic mitral valve guided by live three-dimensional (3D) transesophageal echocardiography. This method provided high-quality 3D imaging that was useful in guiding transseptal puncture and demonstrating prosthetic valve function during this evaluation.

Body composition of growing and adult cats as measured by use of dual energy X-ray absorptiometry.

BACKGROUND AND PURPOSE: Total body scans were performed on 89 domestic cats of various ages, using dual energy x-ray absorptiometry (DEXA) to determine body composition, including fat, lean, and bone mineral content. Bone mineral density results from scans also are presented. METHODS: This cross sectional study included data for cats from a closed colony and from privately owned cats. Data were grouped by age and were analyzed by sex and reproductive status to provide information as to the rate of growth of the individual components of body composition. RESULTS: The results indicate that the rate of accretion of bone mineral, fat, and lean tissue differs throughout maturation and by sex. Regressions are provided to highlight age- and sex-related differences. CONCLUSIONS: The results of this study emphasize the benefits of examining the growth of each component of body composition when studying the effects of nutrition, disease processes, or therapeutic interventions.

Further novel milbemycin antibiotics from Streptomyces sp. E225. Fermentation, isolation and structure elucidation.

Ten novel alpha and beta class milbemycins have been isolated and characterized from the Streptomyces sp. E225, which has previously been shown to produce four related milbemycins. Some of the metabolites contain new structural features including, VM48641 which possesses an alpha-methoxyl substituent at C-27, and VM48642 which contains a furan ring at the terminus of the C-26 side chain. Several of these new compounds were shown to possess potent anthelmintic activity. An analysis of NMR chemical shift trends in this series of metabolites is presented.

The effect of the motility stimulants, caffeine, pentoxifylline, and 2-deoxyadenosine on hyperactivation of cryopreserved human sperm.

OBJECTIVE: To determine if the motility stimulants, caffeine (7 mM), pentoxifylline (3 mM), 2-deoxyadenosine (3 mM), and a combination of the three would induce hyperactivated (HA) motility. DESIGN: Controlled laboratory study of stimulants using cryopreserved semen from 10 donors at three time points. SETTING: The study was performed in the Andrology Laboratory at Prince Henry's Institute of Medical Research Clayton, Victoria, Australia. INTERVENTIONS: Stimulants in doses maximally effective for stimulation of motility were incubated with suspensions of previously cryopreserved sperm. MAIN OUTCOME MEASURES: Motility characteristics (curvilinear velocity [VCL], linearity [LIN], and maximum amplitude of lateral head displacement [ALHmax]) were derived using the single cell track facility of the CellSoft computer-automated semen analyzer (Cryo Resources Ltd., Montgomery, NY). Videotapes were visually inspected, and 125 sperm cell trajectories exhibiting characteristic HA behavior were identified. The HA motility thresholds (5th or 95th centiles) were as follows: VCL > 74 microns/s, LIN < 74%, and ALHmax > 4.7 microns. Cells with motility characteristics outside these limits were regarded as HA. The significance of the effect of the stimulants on the proportion of sperm exhibiting HA was examined by Poisson regression analysis. RESULTS: Sperm washing (removal of the cells from the cryoprotectant) and swim-up caused significant changes in the VCL and straight line velocity and a twofold (5.6% to 11.9%) increase in the proportion of HA cells. In the presence of motility stimulants, the proportion of HA cells was significantly increased threefold (11.9% to 32.5%) above that seen in the control washed sperm. Hyperactivated motility declined after 1 to 2 hours, but 2-deoxyadenosine demonstrated a prolonged effect. CONCLUSION: These motility stimulants that affect adenosine 3':5' monophosphate in human sperm stimulate cyclic hyperactivation.

A novel series of milbemycin antibiotics from Streptomyces strain E225. II. Isolation, characterization, structure elucidation and solution conformations.

A novel series of milbemycin antibiotics were isolated from the fermentation broth of a Streptomyces species designated E225. The structures of the four main metabolites VM 44857 (1), VM 44864 (2), VM 44865 (3) and VM 44866 (4) were determined by NMR techniques. In addition we describe the solution conformations of the major metabolite VM 44857 (1).

Is day hospital treatment effective, and can success be predicted?

Clinical improvement is demonstrated in a group of 41 day patients of mixed diagnosis by changes in measures of depression, self-esteem, loquacity and sociability over a period of six weeks. Staff predictions of success, made after 2 weeks, correlated positively (Spearman's rho = 0.53) with an overall assessment of success after 6 weeks, which itself was positively correlated with improvements in scores on depression (rho = 0.58) and sociability (rho = 0.66 and 0.60). The patients for whom staff predicted least success were in 6 cases out of 7 men aged 20-51.

Self poisoning: could psychiatric management be improved?

A retrospective case note study was made of 93 cases of deliberate self-poisoning admitted to the Casualty Department of a busy District General Hospital. The population under investigation is described in terms of age, sex and substance overdosed; it is broadly similar to populations described in most other studies of overdose. Our results show a higher incidence of functional psychoses (19.4%) than other studies, due to an excess of depressive psychosis in females. The main finding is that 84% of patients referred for psychiatric out-patient treatment either failed to attend or failed to complete the treatment. These results are discussed and suggestions made.

Factors influencing effectiveness of day hospital treatment.

One hundred consecutive admissions to a Psychiatric Day Hospital were studied. Outcome was assessed in terms of regularity and duration of Day Hospital attendance, transfer to inpatient care, and return to employment of unemployed patients. None of these outcome measures showed significant differences when groups of patients were compared according to age, sex or diagnosis. Similarly, no differences were found when patients living alone were compared with patients living with families, between employed and unemployed patients, between patients referred from in-patient care and those referred from out-patients, or when patients were compared according to their preferred types of Day Hospital activity.

Psychiatric day hospitals: the patients and their preferences in treatment.

One hundred and sixty-five patients were seen after one week of day-hospital attendance, and 82 of them four weeks later. Their demographic characteristics, and their preferences in day-hospital treatment are described. Non specific factors of getting out of the home and mixing with other people, the opportunity to discuss problems, and taking part in various occupational activities concerned with improving coping skills were seen by the patients as valuable. Staff visits to the patient's home, family interviews and ward rounds were much less supported.

Life events before the onset of rheumatoid arthritis.

All female patients seen at a rheumatological clinic within 1 year of the onset of rheumatoid arthritis were referred for psychiatric assessment. There was 1 refusal and 22 patients were seen by the author, a psychiatrist working in the Department of Rheumatology. Psychiatric assessment, combined with a brief survey of important life events in the year before the onset of symptoms, was compared with a similar assessment made on randomly selected age-matched well women, among whom there was also 1 refusal. 12 of the patients and 5 controls (p = 0.03) reported a bad relationship in childhood with their mothers. 15 patients reported life events in the year before the onset of the arthritis, compared to 8 controls in the matching year (p = 0.03). In 12 of these 15 patients and 3 of the controls the events were assessed as carrying moderate or considerable long-term emotional threat (p = 0.005). In 11 of these 12 patients the interval between the event and the onset was less than 3 months.