Soybean aphid

Originating text in English.Citation: Krupke, Christian H. (2005). Soybean aphid. Purdue University, Cooperative Extension Service, 217-W

An Economic Analysis of Control of the Western Corn Rootworm Variant across Indiana

A variant of the western corn rootworm (CRW) has adapted to the widely used cultural practice of crop rotation. This study analyzed the economic value of control options controlling the western CRW variant across Indiana. The options analyzed are soil insecticides, seed-applied insecticides, the recently commercialized genetically modified corn to resist CRW (CRW corn), or not controlling the western CRW variant. The results suggest that the economic value of CRW corn may exceed that of the alternative options for corn producers with high western CRW variant pressure, irrespective of producers' risk aversion levels and have the highest economic value for risk-averse producers in the moderate western CRW variant pressure region of Indiana.Crop Production/Industries,

Pest Management in Indiana Soybean Production Systems

As the disparity in farm size continues to increase and university Extension budgets tighten, it is imperative that Extension correctly identifies the specific needs of our clientele. Our objective was to identify clientele educational needs and to provide a framework for directing applied soybean research efforts. This assessment was conducted through a detailed direct-mail survey that was sent to 5,000 (1,330 respondents) Indiana soybean growers. The results of the survey demonstrate differences among grower operation sizes with respect to scouting and pest management practices. Farmers with large operations generally scout and manage pests more intensively than small or mid-size farmers

Light emission, light detection and strain sensing with nanocrystalline graphene

Graphene is of increasing interest for optoelectronic applications exploiting light detection, light emission and light modulation. Intrinsically light matter interaction in graphene is of a broadband type. However by integrating graphene into optical micro cavities also narrow band light emitters and detectors have been demonstrated. The devices benefit from the transparency, conductivity and processability of the atomically thin material. To this end we explore in this work the feasibility of replacing graphene by nanocrystalline graphene, a material which can be grown on dielectric surfaces without catalyst by graphitization of polymeric films. We have studied the formation of nanocrystalline graphene on various substrates and under different graphitization conditions. The samples were characterized by resistance, optical transmission, Raman, X-ray photoelectron spectroscopy, atomic force microscopy and electron microscopy measurements. The conducting and transparent wafer-scale material with nanometer grain size was also patterned and integrated into devices for studying light-matter interaction. The measurements show that nanocrystalline graphene can be exploited as an incandescent emitter and bolometric detector similar to crystalline graphene. Moreover the material exhibits piezoresistive behavior which makes nanocrystalline graphene interesting for transparent strain sensors