• A H Rajasab

      Articles written in Proceedings – Plant Sciences

    • Circadian periodicities of some airborne pollen at Gulbarga, India

      M Mari Bhat A H Rajasab

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      Circadian periodicities for 11 airborne pollen types abundant in the air over Gulbarga was determined based on the air sampling data obtained by operating a Burkard volumetric spore trap for a period of one year from July 1984 to June 1985. In general, pollen concentration in air was high between 10–16 h with peak incidence around noon.

      A number of circadian periodicities were observed. Peak concentration for most types occurred at about mid-day, these includedParthenium hysterophorus, Cyperaceae Amaranthus-chenopod group,Helianthus annus andXanthium strumarium. Acacia nilotica andCassia auriculata peaks were around dawn. Members of Poaceae,Eucalyptus sp. andArgemone mexicana showed post-dawn pattern.

    • Splash dispersal inRamulispora sorghi Olive and Lefebreve, the casual organism of sooty stripe of sorghum

      A H Rajasab A Ramalingam

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      The conidia ofRamulispora sorghi were produced in a mucilaginous mass and dispersed through splash-off and wash-off mechanisms during rain, while the sclerotia ofRamulispora sorghi were produced freely and attached superficially to the host leaf surfaces, dispersed through air over short distances and deposited on the sampling surfaces at the rate of 22 sclerotia/cm2/day.

      Greater number of conidia were monitored by splash traps during the kharif crop period as compared with that of rabi. The peak conidial dispersal was noticed during the 10-leaf stage—flag leaf growth stages of sorghum crop. Both incident water drops (splash-off) and flowing water drops (wash-off) liberated the conidia from the sporulating lesions. Peak liberation of conidia occurred with the water drops from 3–7 and most conidia were removed from the sporulating lesion within 60 s indicating the possible dispersal of the pathogen even during short traces of rain.

    • Splash dispersal inColletotrichum graminicola (Ces.) Wilson, the causal organism of anthracnose of sorghum

      A H Rajasab A Ramalingam

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      The conidia ofColletotrichum graminicola (Ces.) Wilson were dispersed only by rain drops. The dispersal was related to the frequency of rainfall. Under field conditions, conidia were dispersed vertically up to a height of 0·75 m and laterally up to a distance of 1 m from the source. Both incident water drops and flowing water liberated conidia from the sporulating lesions. Peak liberation of conidia occurred with the water drops 3–11, and most conidia were removed from the sporulating lesions within 60 s, suggesting dispersal of the pathogen even during small showers of rain.

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