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The effect of copper sprays on bacterial blight and coffee berry disease in Kenya
Author(s) -
KAIRU G. M.,
NYANGENA C. M. S.,
CROSSE J. E.
Publication year - 1985
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1985.tb01351.x
Subject(s) - berry , copper , biology , loam , bordeaux mixture , soil water , blight , agronomy , horticulture , yield (engineering) , toxicology , fungicide , ecology , materials science , metallurgy
In field trials four different copper formulations, Kocide 101, Perenox, copper oxychloride and Procida Bordeaux Mixture effectively controlled bacterial blight and coffee berry disease and significantly increased yields of clean coffee. Under a severe incidence of the two diseases, Kocide 101 sprays were superior in performance. Copper sprays induced phytotoxic symptoms on light soils with low organic matter, but not on heavy, loamy soils. Residual effects of copper sprays in one year increased the susceptibility of trees to infection in the next. Cumulative copper sprays in 2 years had a significant effect on the control of both diseases and on yield response but gave an indication of long‐term problems that could arise from excessive use of copper.