The diseases and pests of the rubber tree . ?^ • .- ??^-^^, v^^??-???# \ , -y ??? ^-^ ?,^^r -^ Fig. 6.—^Root attacked by UsttUina zonata, showing external black cushions, x J. indication of this disease. Many other fungi which belong.

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Keywords: ., bookcentury1900, bookdecade1920, bookidcu3192400285, bookyear1921