Effects of planting date and dinocap applications on the control of powdery mildew and yields of seed and seed oil in coriander

Experiments were conducted during 1992/93 and 1993/94 to determine the effe ct of different planting dates and dinocap applications on control of powde ry mildew and yields of early and late maturing coriander cultivars. Early plantings resulted in lower overall disease severity values for both the cu ltivars, but the late maturing cultivar S-33 benefited more than RD-44, an early maturing cultivar. Early planting resulted in smaller increases in yi eld in RD-44 but provided considerable economic gains in S-33. Further, it was possible to achieve similar levels of control of powdery mildew and yie lds in coriander with fewer dinocap applications by early plantings of both the cultivars. Therefore, to reduce the fungicide inputs, it is important that emphasis should be placed on early plantings for managing powdery mild ew especially in environments conducive for its development.