By Guido Rosignoli
Publication by way of Rosignoli, Guido
Read Online or Download Army Badges and Insignia of World War II: Bk. 2 (Colour) PDF
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Extra info for Army Badges and Insignia of World War II: Bk. 2 (Colour)
Recognizing that these terms refer to resting structures is helpful when reading about plant diseases because they indicate that a pathogen can potentially persist in soil. Some pathogens are heterothallic, which means they produce the dormant structure only when individuals of opposite mating types (the fungal equivalent of male and female) interact. This is important because presence or absence of the different mating types can determine whether the pathogen persists in the soil. For example, although the cucurbit downy mildew fungus, Pseudoperonospora cubensis, is potentially capable of producing oospores, only one mating type occurs in the US; thus, it cannot produce oospores, and that prevents it from surviving winter in the northeast US.
Other sections in this chapter discuss many examples of pests that are and are not effectively managed by crop rotation. Soil management and pest management interact in many ways. For example, crop nutrition affects plant disease resistance, some cover crops can reduce certain types of soilborne diseases but promote others, and high soil physical quality improves the effectiveness of mechanical weed management. All of these interactions, and many others, are influenced by crop rotation. Some notable interactions between soil and pest management that can be managed by crop rotation are addressed in the following sections.
In an organic crop rotation, the grower manages soil organic matter and nutrient availability by incorporating different crop residues, cycling among crops with different nutrient needs, using cover crops, and adding organic soil amendments. Most crops deplete soil nutrients during their growth cycle. Some of these nutrients leave the farm as harvested products, and the rest return to the soil as crop residues. The nutrients in residues may or may not be available to the next crop. Crop roots and residues improve soil fertility by stimulating soil microbial communities and improving soil aggregation.