"Efficacy of fungicide mixtures for the management of Phytophthora infestans (US-1) on potato"

Fungicide application strategies (timing, frequency, rates and mixtures) are important for the control and
resistance management of potato late blight caused by Phytophthora infestans. The efficacy of fungicide
mixtures consisting of fenamidone + mancozeb and propamocarb HCL + mancozeb at various rates and
in spray regimes containing metalaxyl and mancozeb was evaluated for late blight control (US-1) at four
locations in Kenya. Propamocarb HCL + mancozeb significantly (P< 0.05) reduced foliar blight compared
with mancozeb and the untreated control under moderate to severe disease pressure. Disease severity
was significantly lower following application of propamocarb HCL + mancozeb at a rate of 4L ha-1 than
at rates of 2L and 3L ha-1 in 1999 and 2000, but it was not significantly lower following applications at a
rate of 3L ha-1 in 2000 and 2001. There were no significant differences in mean final late blight score
among the three rates of 0.9, 1.0 and 1.1 kg ha-1 of fenamidone + mancozeb. All fungicide mixtures and
application sequences significantly reduced the area under the disease progress curve and final late
blight scores as compared with the unprotected control. Total and marketable tuber yield significantly
(P< 0.05) increased in all fungicide-treated plots.

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