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Modelling competition in two-species mixturesPark-Dwyer, Sarah Evelyn January 1999 (has links)
No description available.
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Effect of sun drying on microbes in non-conventionalBhila, TE, Ratsaka, MM, Kanengoni, A, Siebrits, FK January 2010 (has links)
Abstract
There is concern whether cabbage and beetroot wastes from the Fresh Produce Market are safe for feeding animals given the fact that some will have been discarded at the onset of putrefaction. This study evaluated the effects of sun-drying on microbiological load (E. coli, coliform, yeast and moulds and total bacterial count) in waste vegetables from the fresh produce market, since smallholder farmers tend to use the by-products without processing given the opportunity. Cabbage and beetroot wastes were sun dried to 14% moisture and micro-organisms were enumerated on both wet and dried samples. The results showed that sun drying reduced the level of micro-organisms significantly in both cabbage and beetroot. Although microbial load varied from batch to batch in the wet samples, coliforms were significantly more abundant in wet beetroot than in the dried samples. However, dried beetroot contained significantly more yeast and moulds. Wet cabbage contained more coliform and yeast and moulds compared to sun-dried cabbage. The sun drying process is thus an efficient processing method for resource poor farmers to reduce the microbial load in these animal feed sources and improve their shelf life.
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Insecticide resistance in Plutella xylostella (Linnaeus) (Yponomeutidae) in the Federal District, Brazil : effects of local and long-range movement of mothsBranco, Marina Castelo January 1997 (has links)
No description available.
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The emergence of Delia radicum in relation to agricultural practiceBrindle, Graham January 1987 (has links)
Cabbage root fly passes through three generations a year in the south of England. The first generation peaks in late April to early May having overwintered in diapause. Recently, populations have been discovered in which the emergence of first generation flies was protracted, lasting until mid-July. The project aimed to investigate the incidence of late emergence in Devon and to examine the ways in which late emergers differed from early emergers in their progress through diapause. A new emergence trap was developed and used in conjunction with yellow water traps to monitor the emergence of cabbage root fly populations at locations of contrasting agricultural practice. Late emergence was widespread in Devon, occurring later (up to September), and in a greater proportion of some populations than any previously reported. The phenomenon appears to be a response to the planting of brassicas in June, as flies emerging at the normal time may not be able to locate a host crop. Emergence in a substantial proportion of one population was delayed for a year. This has not been been previously reported in cabbage root fly and represents a 'sit and wait' strategy associated with short-lived habitats, occurring in patches often separated by considerable distances but which frequently reappear in approximately the same location. A gas chromatography technique was developed which is capable of individually monitoring the respiration rates of large numbers of pupae. The results suggested that the temperature optimum for diapause development may r1se in late emergers, possibly above the threshold for postdiapause development. There was considerable 1ntrapopulat1on variation in temperature responses. Overall, the results suggest that the level of variation in temperature response and emergence times between and within populations will require careful local investigation with continuous reassessment of selection pressures, for an accurate prediction of cabbage root fly emergence.
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Tritrophic interactions between crucifers, aphids and hymenopteran parasitoidsKalule, Twaha January 2000 (has links)
No description available.
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The effect of a cabbage-carrot intercropping system on the incidence of cabbage pests / W.J. WeeksWeeks, William James January 2007 (has links)
Thesis (M. Environmental Science))--North-West University, Potchefstroom Campus, 2007.
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Undersowing rutabaga (Brassica napus L.) with white clover (Trifolium repens L.) : effects on the cabbage root maggot (Delia radicum (L.)) and its parasitoid/predator (Aleochara bilineata Gyll.) /Coady, Juanita R., January 1999 (has links)
Thesis (M.Sc.), Memorial University of Newfoundland, 2000. / Restricted until June 2001. Bibliography: leaves 82-87.
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Growing Cole Crops in ArizonaPew, W. D. 05 1900 (has links)
This item was digitized as part of the Million Books Project led by Carnegie Mellon University and supported by grants from the National Science Foundation (NSF). Cornell University coordinated the participation of land-grant and agricultural libraries in providing historical agricultural information for the digitization project; the University of Arizona Libraries, the College of Agriculture and Life Sciences, and the Office of Arid Lands Studies collaborated in the selection and provision of material for the digitization project.
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Isolation of a highly reassociating fraction of Chinese Cabbage nuclear DNA and its role in ribosomal RNA synthesisThornburg, William Harry, 1939- January 1968 (has links)
No description available.
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Biologie et répression des larves des racines, Hylemya spp., inrestant les cultures de crucifères.Ritchot, Claude. January 1968 (has links)
No description available.
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