Origin and diversity[ edit ] Speciation and domestication[ edit ] The wild ancestor of cultivated adzuki bean is probably Vigna angularis var. Enlarged seeds occurred during the later Bronze Age or Iron Age , periods with plough use. Cultivated adzuki beans have fewer but longer pods, fewer but larger seeds and a shorter stature, but also a smaller overall seed yield than wild forms. The wide spread of weed forms is due to adaptation to human-disturbed habitats, escapes of old cultivars , and natural establishment from derivatives of hybrids between cultivars and wild forms.
However, in cultivated gardens the weed form is recognized as contamination and lowers the seed quality of adzuki cultivars. In China , the corresponding name Chinese: In English-language discussions of Chinese topics, the term "red bean" often is used especially in reference to red bean paste , but in other contexts this usage may cause confusion with other beans that also are red.
In normal contexts, "red cowpeas " have been used to refer to this bean. Kong "beans" without qualifiers usually means soybeans.
In some parts of India , they are referred to as "red chori". Cultivation[ edit ] Area and yield[ edit ] The adzuki bean is mainly cultivated in China , ha , Japan 60, ha , South Korea 25, ha and Taiwan 15, ha data published Hot temperatures stimulate vegetative growth and are therefore less favorable for pea production.
The plant can withstand drought but severe reduction in yield is expected. Rarely seeds are sown by broadcast. Growth of the crop is slow, therefore weed control is crucial mainly between germination and flowering. Cultivation systems differ largely among different countries. In China adzuki bean is often grown in intercrops with maize, sorghum and millet while in Japan the bean is grown in crop rotations. Furthermore, pests as adzuki pod worm, Japanese butterbur borer and cutworm attack the crop.
Bean weevil is an important storage pest. The adzuki bean is an annual ,   rarely biennial  bushy erect or twining herb   usually between 30 and 90 centimeters high.