Common wheat "Triticum compactum", but in India "T. sphaerococcum") are closely related to common wheat, but have a much more compact ear. Their shorter rachis segments lead to spikelets packed closer together. Compact wheats are often regarded as subspecies rather than species in their own right (thus "T. aestivum" subsp. "compactum"). Common wheat Common wheat ("Triticum aestivum"), also known as bread wheat, is a cultivated wheat species. About 95% of the wheat produced is common wheat, which is the most widely grown of all crops and the cereal with the highest monetary yield. Numerous forms of wheat have evolved under human selection.
Crop weed Crop weed Crop weeds are weeds that grow amongst crops. Examples of crop weeds include chickweed, barnyard grass, dandelion, striga and fallopia japonica. Despite the potential for some crop weeds to be used as a food source, many can also prove harmful to crops, both directly and indirectly. Crop weeds can inhibit the growth of crops, contaminate harvested crops and often spread rapidly. They can also host crop pests such as aphids, fungal rots and viruses. Cost increases and yield losses occur as a result. Striga, one of the main cereal crop weeds in Sub-Saharan Africa, commonly causes yield losses