This report outlines the "agriculture of the middle" sector and specific actions and policies that need to be addressed. It was prepared as a white paper of the Leopold Center with input from a number of authors.
Saalau Rojas, E., Gleason, M. L., Batzer, J. C, and Duffy, M. 2011. Feasibility of delaying removal of row covers to suppress bacterial wilt of nuiskiiielon (Cticumis melo). Plant Dis. 95:729-734.Bacterial wilt, caused by Erwinia tracheiphila, is a major disease of cucurbit crops in the United States. Management of the disease relies on controlling two vector species, striped (Acalymma vittatum) and spotted (Diabrotica undecirrtptmctata) cucumber beetles. Six field trials were conducted at Iowa State University research farms during 2(X)7, 2008, and 2(X)9 to assess the efficacy of delayed removal of spunbond polypropylene row covers to control bacterial wilt on muskmelon (Cucumis melo). Treatments were (i) row cover removed at anthesis (conventional timing of removal), (ii) covers removed 10 days alter row cover ends were opened at anthesis, (iii) covers removed 10 days after bumble bee hives were inserted under row covers at anthesis, and (iv) a noncovered control. In two field trials during 2007 and 2(X)8, the delayed-removal row-cover treatments significantly suppressed bacterial wilt throughout the growing season and enhanced yield compared with the noncovered and removal-at-anthesis controls. In
Results of over 300far JR and mid JR transmission measurements taken during several EOPACE (BO Propagation Assessment in Coastal Environments) intensive operational periods (lOP's) over the low-level 15 km transmission path across San Diego bay are presented. A thorough comparison with calculations obtained using simultaneously measured bulk meteorological parameters with the IR Boundary Layer Model (IRBLEM), illustrate the effects thatrefractance, aerosol extinction and molecular extinction can have on the transmission. Discrepancies between the transmission measurements and the model's predictions are identified and investigated by varying various model parameters, and looking at available measured aerosol size distributions and refraction measurements over the path. Comparison with the measured transmissions are reasonably good and show that the total transmission depends critically on all three effects, with the molecular transmittance depending upon the water vapour density and the characteristics of the JR source and detector, the aerosol transmittance upon the visibility (aerosol concentration), and the refractive effects on the stability of the marine boundary layer or the virtual potential air-sea temperature difference.
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