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Relationship between Climatic Variables during Early Flowering of Sorghum and the Incidence of Sugary Disease caused by Sphacelia sorghi
Author(s) -
McLaren N. W.,
Wehner F. C.
Publication year - 1990
Publication title -
journal of phytopathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 60
eISSN - 1439-0434
pISSN - 0931-1785
DOI - 10.1111/j.1439-0434.1990.tb01155.x
Subject(s) - biology , pollen , incidence (geometry) , sorghum , disease , maximum temperature , horticulture , agronomy , botany , medicine , physics , optics , thermodynamics
The relationship between sugary disease incidence and six climatic variables during the early stages of flowering was determined in field trials conducted over three seasons. Daily maximum temperature was highly significantly correlated with sugray disease incidence and accounted for 83 % of the variation observed in disease incidence. The critical period for infection was limited to 5 days after commencement of pollen shed. Deviations from the temperature × sugary disease model occurred in late flowering plots. These were correlated with low temperatures during the 2 weeks prior to pollen shed and, thus, possibly, a reduction in pollen vigour.