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- W929034152 abstract "Soil-borne oospores of Sclerospora graminicola induced systemic disease in Pennisetum typhoides [P. americanum] plants 9 days after sowing. Sporangia produced from these plants initiated secondary infection in the field. Av. daily mean sporangial concn during the season was 22.66/cm². On rainy days more sporangia were trapped and the concn varied directly with rainfall. As the crop matured, sporangial density in the air and disease incidence fell. More sporangia were deposited on the leaves of 20- than 40-day-old plants, on the adaxial than the abaxial side of the leaves, and on the tip than on the rest of the leaves. Water collected from the whorls of apparently healthy plants contained infective sporangia. A single diseased plant could start an epidemic if the plants were in a susceptible stage and the environment favourable, the disease spreading mainly in the direction of the prevailing wind. Late-sown crops showed more disease incidence and severity than early sown ones. The importance of sporangia in relation to epidemiology and control is discussed" @default.
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- W929034152 date "1982-01-01" @default.
- W929034152 modified "2023-09-26" @default.
- W929034152 title "Importance of sporangia in the epidemiology of downy mildew of pearl millet" @default.
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