Effect of tillage and planting date on seasonal abundance and diversity of predacious ground beetles in cotton.

A 2-year field study was conducted in the southern High Plains region of Texas to evaluate the effect of tillage system and cotton planting date window on seasonal abundance and activity patterns of predacious ground beetles. The experiment was deployed in a split-plot randomized block design with tillage as the main-plot factor and planting date as the subplot factor. There were two levels for each factor. The two tillage systems were conservation tillage (30% or more of the soil surface is covered with crop residue) and conventional tillage. The two cotton planting date window treatments were early May (normal planting) and early June (late planting). Five prevailing predacious ground beetles, Cicindela sexguttata F., Calosoma scrutator Drees, Pasimachus spp., Pterostichus spp., and Megacephala Carolina L. (Coleoptera: Carabidae), were monitored using pitfall traps at 2-week intervals from June 2002 to October 2003. The highest total number of ground beetles (6/trap) was observed on 9 July 2003. Cicindela sexguttata was the dominant ground dwelling predacious beetle among the five species. A significant difference between the two tillage systems was observed in the abundances of Pterostichus spp. and C. sexguttata. In 2002. significantly more Pterostichus spp. were recorded from conventional plots (0.27/trap) than were recorded from conservation tillage plots (0.05/trap). Significantly more C. sexguttata were recorded in 2003 from conservation plots (3.77/trap) than were recorded from conventional tillage plots (1.04/trap). There was a significant interaction between year and tillage treatments. However, there was no significant difference in the abundances of M. Carolina and Pasimachus spp. between the two tillage practices in either of the two years. M. Carolina numbers were significantly higher in late-planted cotton compared with those observed in normal-planted cotton. However, planting date window had no significant influence on the activity patterns of the other species. Ground beetle species abundance, diversity, and species richness were significantly higher in conservation tillage plots. This suggests that field conditions arising from the practice of conservation tillage may support higher predacious ground beetle activity than might be observed under field conditions arising from conventional tillage practices.

Testing a scalable community-based approach to improve maternal and neonatal health in rural Nepal.

OBJECTIVE: The aim of the study was to determine the feasibility of improved maternal-neonatal care-seeking and household practices using an approach scalable under Nepal's primary health-care services. STUDY DESIGN: Impact was assessed by pre- and post-intervention surveys of women delivering within the previous 12 months. Each district sample comprised 30 clusters, each with 30 respondents. The intervention consisted primarily of community-based antenatal counseling and dispensing and an early postnatal home visit; most activities were carried out by community-based health volunteers. RESULT: There were notable improvements in most household practice and service utilization indicators, although results regarding care-seeking for danger signs were mixed. CONCLUSION: It is feasible in a Nepal setting to significantly improve utilization of maternal-neonatal services and household practices, using the resources available under the government primary health-care system. This has the potential to significantly reduce neonatal mortality.

Sampling methods, dispersion patterns, and fixed precision sequential sampling plans for western flower thrips (Thysanoptera: Thripidae) and cotton fleahoppers (Hemiptera: Miridae) in cotton.

A 2-yr field study was conducted to examine the effectiveness of two sampling methods (visual and plant washing techniques) for western flower thrips, Frankliniella occidentalis (Pergande), and five sampling methods (visual, beat bucket, drop cloth, sweep net, and vacuum) for cotton fleahopper, Pseudatomoscelis seriatus (Reuter), in Texas cotton, Gossypium hirsutum (L.), and to develop sequential sampling plans for each pest. The plant washing technique gave similar results to the visual method in detecting adult thrips, but the washing technique detected significantly higher number of thrips larvae compared with the visual sampling. Visual sampling detected the highest number of fleahoppers followed by beat bucket, drop cloth, vacuum, and sweep net sampling, with no significant difference in catch efficiency between vacuum and sweep net methods. However, based on fixed precision cost reliability, the sweep net sampling was the most cost-effective method followed by vacuum, beat bucket, drop cloth, and visual sampling. Taylor's Power Law analysis revealed that the field dispersion patterns of both thrips and fleahoppers were aggregated throughout the crop growing season. For thrips management decision based on visual sampling (0.25 precision), 15 plants were estimated to be the minimum sample size when the estimated population density was one thrips per plant, whereas the minimum sample size was nine plants when thrips density approached 10 thrips per plant. The minimum visual sample size for cotton fleahoppers was 16 plants when the density was one fleahopper per plant, but the sample size decreased rapidly with an increase in fleahopper density, requiring only four plants to be sampled when the density was 10 fleahoppers per plant. Sequential sampling plans were developed and validated with independent data for both thrips and cotton fleahoppers.

Corneal ulcers in Nepal.

In Kathmandu, Nepal, 133 cases of corneal ulcers were examined and scraped by the investigators during 1981. Corneal ulcers were seen to be more common in females during the active years of life, occurring more frequently during monsoon and autumn seasons. Trauma by vegetative matter was the common antecedent. Organisms were grown in about 50.0% of the cases. Bacteria were seen to be responsible in about 75.0%, and fungi in about 25.0% of growth-positive cases. Sensitivity tests in vitro showed that carbenicillin, chloramphenicol, cephaloridine, methicillin, and lincomycin were most effective against bacteria and clotrimazole was most effective against fungi.