Weed Research in the Central Laboratory of Plant Protection in Cuba

THEORY AND PRACTICE OF WEED CONTROL. R. J. Stephens. Science in Horticulture Series. Macmillan, London, 1982. ISBN 0 333 21294 0. Pp.215. Price (paperback) £8.95.

OIL PALM DISEASES AND DISORDERS. P. D. Turner. Oxford University Press, Selangor, Malaysia, 1981. ISBN 0 19 580468 6. Pp. 280.

MAJOR WEEDS OF RICE IN SOUTH AND SOUTHEAST ASIA. K. Moody. International Rice Research Institute, Los Baños, Laguna, Philippines, 1981. Pp. 79.

BIOLOGICAL CONTROL OF WEEDS ‐ A WORLD CATALOGUE OF AGENTS AND THEIR TARGET WEEDS. Edited by M. H. Julien. Commonwealth Agricultural Bureaux, Farnham Royal, UK, 1982. ISBN 0 85198 494 0. Pp 108. Price £8.

COMPENDIUM OF SOYBEAN DISEASES. Second Edition. Edited by J. B. Sinclair. Amercian Phytopathological Society, St. Paul, Minnesota, 1982. Pp. 104. Price US $12.00.

FIELD WORKER EXPOSURE DURING PESTICIDE APPLICATION. Edited by W. F. Tordoir and E. A. H. van Heemstra. Elsevier, Amsterdam, 1980. ISBN 0 444 41879 2. Pp. 208. Price US $45.00.

EDUCATION AND SAFE HANDLING IN PESTICIDE APPLICATION. Edited by E. A. H. van Heemstra and W. F. Tordoir. Elsevier, Amsterdam, 1982. ISBN 0 444 42041 X. Pp. 302. Price US $69.75.

LES PRINCIPAUX ENNEMIS DES CULTURES MARAICHERES AU SENEGAL E. F. Collingwood, L. Bourdouxhe and M. Defrancq. Centre pour le Developpement de ('Horticulture, Dakar, 1982.     

Weed competition in a cucumber crop

Abstract

Two field experiments were conducted on cucumber (var. Explorer) during 1979 in a randomised trial design with four replications on the red ferralitic soil of Havana province, Cuba. The effect on the crop of the following different treatments was established: weeded regularly for 20, 30 or 40 days after crop emergence and during the whole crop cycle; left unweeded for these same periods. The mean data of both experiments showed that the weed incidence for 20 or more days following crop emergence affects cucumber yields, causing losses of 100% if the weeds were not removed during the crop cycle. Good high yields, similar to those of the treatment weeded during the crop cycle, were obtained when the weeds were removed 30–40 days after crop emergence.