Ian H Gibbs, Louis E. Chinnery and Jeffery E. Jones for the 7th Annual Technical Conference of the BSTA, 1989
The diamondback moth, Plutella xylostella (L.) (Lepidoptera: Yponomeutidae) is certainly one of the world’s most important pest species. It mainly attacks brassicaceous crops especially cabbage, Brassica oleracea L. var. capitata L., and cauliflower, B. oleracea var. botrytis L.. It is found north of latitude 60° in Iceland, throughout the temperate zone and in the tropics (CIE, 1967). Hardy (1938 cited by Ooi, 1986) suggested that it probably originated in the Mediterranean region which was also the evolutionary centre for the B. oleracea crops
All Brassicas contain glucosinolates which, when the leaves are damaged, give rise to bitter tasting and goitrogenic substances: isothiocyanates, thiocyanates, nitriles and goitrin. Selection, from the start of domestication, must have been for plants which were less bitter-tasting (Thompson, 1976). Unfortunately, this improvement in taste was at the cost of reducing the plants natural defense against pests.
Presented by E.H. Alleyne at the 7th Annual Technical Conference of the BSTA 1989
E. postfasciatus (West Indian sweet potato weevil) infests both stems and tubers of sweet potatoes. It is not quite certain how the adults are able to reach the tuber in the soil, but it is speculated that they either travel along the paths created by the roots and/or enter through cracks in the soil. However, sweet potatoes grown during the rainy season or in irrigated ﬁelds, suffer considerable tuber damage by the weevil, despite the almost total absence of cracks in soil. The biology of the insect has been described (Tucker, 1937 Alleyne, 1982). ’
Presented at the Seventh Annual Conference of the BSTA, 1989
It seems to be generally agreed by the sugar industries in this hemisphere that the use of sugarcane and by-products for animal feed is the most generally promising diversification of all the various ideas tried. Some years ago, Barbados was in the forefront of this development but we did not apply much of it. Others have now overtaken us. A few examples: