Thaddee Mutumba Badibanga

Border Treatment to Reduce Insecticide Use in Seed Potato Production: Biological, Economic, and Managerial Analysis

Worldwide, Myzus persicae (Sulzer) is considered the key vector of Potato leafroll virus (PLRV). In the northern Great Plains, introduction of PLRV into seed potato fields is coincident with mid-summer dispersal of winged M. persicae from local crop and weed hosts. Initial colonization of potato fields tends to occur at field margins. In 2003, experiments were conducted in 23 seed potato fields to evaluate effectiveness of targeted methamidophos applications for M. persicae control. These applications provided excellent control (>94%) of colonizing aphids in the borders, slowed subsequent within field spread, and necessitated treatment of 95% fewer hectares than would treating entire fields. Across entire fields, control costs averaged

Measuring Strucutral Change: The Case of China, Malaysia, and Ghana

4.22 per ha for border treatments compared to a hypothetical

Farmers’ Awareness and Use of IPM for Soybean Aphid Control: Report of Survey Results for the 2004, 2005, 2006, and 2007 Crop Years

58.91 per ha for applying methamidophos to entire fields. Thus targeted insecticide applications can provide effective M. persicae control in seed potato fields while greatly lowering insecticide use and application costs overall.ResumenMyzus persicae (Sulzer) es considerado a nivel mundial el vector clave del virus del enrollamiento de la papa (PLRV). En el norte de las Grandes Llanuras, la introducción de PLRV en campos de semilla coincide con la dispersión a mitad del verano de M. persicae alado a partir de cultivos locales y maleza hospedante. La colonización inicial de los campos de papa tiende a realizarse en los bordes de los campos. En 2003, se realizaron experimentos en 23 campos de semilla de papa para evaluar la efectividad del metamidofos para el control de M. persicae. Las aplicaciones dieron un excelente control (> 94%) de los áfidos colonizadores en el borde de los campos, retardaron la posterior diseminación dentro del campo y necesitaron el tratamiento de 95% hectáreas menos que para el tratamiento de campos íntegros. En todos los campos, el costo del control promedió

Dynamics of structural transformation: An empirical characterization in the case of China, Malaysia, and Ghana

4.22 por ha para el tratamiento de los bordes comparado con un hipotético

A Bioeconomic Model of the Soybean Aphid Treatment Decision in Soybeans

58.91 por ha, para aplicar metamidofos a todo el campo. De este modo, las aplicaciones dirigidas de un insecticida pueden proporcionar un control efectivo de M. persicae en campos de semilla de papa disminuyendo enormemente el uso del insecticida y los gastos totales de aplicación.

Producers' Use of Crop Borders for Management of Potato Virus Y (PVY) in Seed Potatoes

We extend the methods developed by Hausmann and Klinger (2006) to measure and compare the dynamics of a country’s structural transformation and apply the methods to China, Malaysia, and Ghana over the period 1962–2000. The results show that the rate of structural transformation is proportionately higher when a country produces more compact clusters of capital and consumer durable goods which in turn appear to lead more rapidly into new varieties of goods of higher unit values. We find that China’s transformation is the result of increasing proximity of her production/export basket to capital goods and consumer durables and the increasing values of new products in these two clusters. Malaysia’s product space in 1962 contained fewer of the world’s cluster of industrial goods than did China’s. The country nevertheless achieved a more rapid pace of transformation in the late 1980s which reduced her structural gap with China. The structure of the Ghanaian economy, however, is stagnant over time, and the country’s production profile is dominated by primary goods of low value.