Abstract
DURING the treatment with commercial '2–4,D' emulsions of small blocks of cacao (Theobroma cacao) for weeding, in Venezuela, a peculiar phenomenon was observed incidentally. Basal shoots ('chupons') react to the treatment with distortion and malformation, then dropping of young leaves. A few scattered leaves developed from buds were wrinkled, more or less curled up to rolled, hardened and rugose or smooth, and more or less ruffled. The size of leaves was frequently reduced, chiefly as regards width in relation to the length. A number of leaves were mottled or even chlorotic, but also vein-banded or with red-stained veins ; others were healthy and normal.
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Posnette, F. A., Trop. Agric., 21 (6), 105 (1944). Posnette, F. A., and Palma, M., ibid., (7) 130 (1944).
Ciferri, R., Bol. Est. Nac. Agr. Moca, B, Bot., 16, 108 (1929); Rev. Fac. Nac. Agron. Medellin, 8 (29/30), 79 (1948).
Baldacci, E., and Topi, M. (in the press).
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CIFERRI, R. Symptomatology of Virus Diseases Induced in Cacao by '2–4,D' Treatment. Nature 163, 881 (1949). https://doi.org/10.1038/163881a0
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DOI: https://doi.org/10.1038/163881a0
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