Performance of the second international mungbean nursery

The test sites, ranging from 3 degrees to 49 degrees N latitude, represented widely different environments. The nursery contained 28 varieties of mungbeans (Vigna radiata (L.) Wilczek) representing a wide diversity in plant type, maturity, seed size and quality, disease resistance, yield potential, and geographic origin. M350 from Korea was the highest yielding variety in the IMN for the second straight year. M409 from Peru, a new entry, was the second highest yielding variety followed by M411 (Hybrid 45) from India, M317 from China, and M374 (MG50-10A) from the Philippines. M317 ranked second in yield in the first IMN. M137 was the earliest variety to flower. M374, M317, and M101 had the largest 1000-seed weight. At the low latitudes all strains tended to be short and flower early. Three of the highest yielding varieties -- M350, M317, and M101 -- have rough, dull seed coats. M416 has yellow seed color. A virus (or virus complex) was the most common disease being reported from 9 locations. However, differences among the strains were not significantly different for any of the diseases reported. Additional research is needed on identification of mungbean diseases and methods for evaluating disease reactions.