This is achieved by

1. Proper selection of geographical area
2. Proper selection of the field
3. Adjusting time of sowing
4. Disease escaping varieties
5. Proper selection of seed and planting material

a) Proper selection of geographical area:

• Cultivation of bajra in wet areas is not profitable due to the diseases, smut (Tolyposporium penicillariae) and ergot (Claviceps microcephala).

b) Proper selection of the field:

• Raising of a particular crop year after year in the same field makes the soil sick, where disease incidence and severity may be more.
• Ex: Wilt of redgram, late blight of potato (Phytophthora infestans), green ear of bajra (Sclerospora graminicola), etc.

c) Time of sowing:

• Ex: Rhizoctonia root rot of redgram is more severe in the crop sown immediately after the rains. Delayed sowing will help in reducing the incidence of disease.
• Ex: Infection of black stem rust of wheat (Puccinia graminis tritici) is more in late sowing, hence, early sowing helps in reduction of stem rust incidence.

d) Disease escaping varieties:

• Early maturing varieties of wheat or pea escape the damage due to Puccinia graminis tritici and Erysiphe polygoni, respectively.

e) Proper selection of seed and planting material:

• Selection of seed and seedling material from healthy sources will effectively manage the diseases such as loose smut of wheat (Ustilago nuda tritici), bunchy top of banana (Banana virus-1), Panama wilt of banana (Fusarium oxysporum f.sp. cubense) and whip smut of sugarcane (Ustilago scitaminae).