The northern and western corn rootworm (Coleoptera:Chrysomelidae) are major pests of corn (Zea mays L). The development of Bt corn, corn that has been genetically modified to produce toxins from Bacillus thuringiensis, has been valuable in controlling the damage these pests can inflict on a grower’s corn. With the large acreage being planting to Bt corn especially in the Midwest, there has been...

in order to study the weed damage and to determinate the influence of weed species and multiple weed species competition in corn (zea mays l.), a field experiment was conducted based on interval mapping at the agronomy research field of ferdowsi university of mashhad during 2009-2010. treatments consisted of four density level of crop (5, 6, 7 and 9 plant.m-2) and four type of weed management (...

Aflatoxin contamination of corn is an important problem internationally, particularly in tropical and subtropical conditions that favor infection and synthesis by Aspergillus. Environmental conditions (drought) and agronomic practices i.e. N fertilization have been reported as favorable to aflatoxin synthesis in the field. This study was undertaken to investigate whether the contamination of co...

Two hundred crossbred lambs were used to determine energy value and optimum inclusion level of field pea (Pisum sativum) in corn-based diets. In experiment one (Exp. 1), 100 crossbred lambs (33.9 ± 1.3 kg initial BW) were blocked by weight and sex (two blocks of ewe lambs per treatment; three blocks of ram lambs per treatment) and fed for 89 days. In experiment two (Exp. 2), 100 crossbred ram l...

This study analyzes the potential impacts of expanded ethanol production on southern agriculture. Results of regression analysis suggest that acreage planted for field crops (corn, cotton, soybeans, and wheat) is inelastic with respect to relative prices. The results provide statistical evidence of potential significant acreage shifts favoring corn over cotton, soybeans, and wheat. Simulations ...

The western corn rootworm (Diabrotica virgifera virgifera LeConte) is an economically important pest of corn. One strategy used to manage western corn rootworm is the planting of transgenic corn that produces one or more Cry toxins derived from Bacillus thuringiensis (Bt). Refuges of non-Bt corn function to delay the development of resistance and the greatest delay in resistance is expected whe...

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To delay evolution of insect resistance to transgenic crops producing Bacillus thuringiensis (Bt) toxins, nearby "refuges" of host plants not producing Bt toxins are required in many regions. Such refuges are expected to be most effective in slowing resistance when the toxin concentration in Bt crops is high enough to kill all or nearly all insects heterozygous for resistance. However, Bt corn,...

Bacterial diversity in transgenic and nontransgenic corn rhizospheres was determined. In greenhouse and field studies, metabolic profiling and molecular analysis of 16S rRNAs differentiated bacterial communities among soil textures but not between corn varieties. We conclude that bacteria in corn rhizospheres are affected more by soil texture than by cultivation of transgenic varieties.