. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. 362 THE AGRICULTURAL NEWS. November 12, INSECT NOTES. SCALE INSECTS AND BLACK BLIGHT IN GRENADA. A paper on this subject, by Mr. G. (I. Auchinleck, , Superintendent of Agriculture, Grenada, was l>rought up for discussion at a meeting of the Agricultural and Commercial Society in that island, in September last. This is of consider- able interest, as it summarizes much of the latest work that has been done in Grenada, in this connexion, so that the fol- lowing abstract of it is presented here. Considera
. Agricultural news. Agriculture -- West Indies; Plant diseases -- West Indies. 362 THE AGRICULTURAL NEWS. November 12, INSECT NOTES. SCALE INSECTS AND BLACK BLIGHT IN GRENADA. A paper on this subject, by Mr. G. (I. Auchinleck, , Superintendent of Agriculture, Grenada, was l>rought up for discussion at a meeting of the Agricultural and Commercial Society in that island, in September last. This is of consider- able interest, as it summarizes much of the latest work that has been done in Grenada, in this connexion, so that the fol- lowing abstract of it is presented here. Consideration was given, first, to the way in which the fungi obtain their food, and it was shown that this is depend- ent upon whether they happen to be parasites or saprophytes; in the former case they obtain nutriment directly from living plants or animals: in the latter, they feed on dead matter. The important point is that black blight {CajDiodium sp.) belongs to the latter class of fungi. The cells of which it is composed are able to absorb sugary liquids through their ?walls and to use them in growing, and producing new cells. In the special instance, the sugary liquid employed is obtain- ed from animals. The question for consideration, then, has to do with the way in which this material is provided. If this matter is explained, valualile indications are obtained as to the way in which lilack blight may be controlled. The sugary liquid is made up of the excretions of scale and mealybugs. It is therefore to these animals that attention must be given, when means are being devised for combating the pest. Thirteen varieties of such insects have been found in Grenada, so far, by Mr. Auchinleck, who exhibited specimens of the most common kinds, as follows: the mango scale, on mangos, honeysuckle, guavas, cashews and imported [Jants; the line scale, on mangos and Strych- nos; the star .scale, on the mango and oleander: Barber's mealy Inig, on cacao; the black scale, on the 'alm
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