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Preliminary experiments with dusting and spraying against insect pests of cotton



Preliminary experiments with dusting and spraying against insect pests of cotton



Ministry Agric Egypt Tech and Science Serv Plant Protect Sect Ent Res Div Bulletin 77: 1-11



In the summer of 1927, a test of sodium fluosilicate as a control for the pink boll worm was carried out. The fluosilicate was mixed with an equal volume of flour and dusted in the early morning when the plants had some dew upon them. Three applications were made, with the result that the pink bollworm infestation was reduced on the average about 53% and there was 66% reduction in the spiny bollworm (Earias insulana). There was no damage to cotton plants by the sodium fluosilicate. Tests made by spraying castor oil diluted with petroleum on cotton plants resulted in burning the plants. An emulsion of castor oil, resin, soft soap and water was then prepared with 10-15% castor oil. After the 1st year's experience with this mixture the author draws the following conclusions: "(1) Castor-oil is distinctly repellent to the bollworms Gelechia (Platyedra) gossypiella and Earias insulana. (2) The effect is in direct relation with the amount of oil used. (3) Castor-oil treatment is rather costly. However, there might be a margin of net profit, which, it is hoped, further study may reveal. (4) Obviously the oil is absolutely harmless to man and animals." Tests of calcium arsenate dusted on cotton for control of the pink bollworm did not give as good control as those of Na fluosilicate. Dusting with Na fluosilicate was also tried for control of the cotton leaf worm (Prodenia litura) on clover. Laboratory tests showed 100% mortality. Three small field plats were then dusted, with the result that the treated plats remained green and luxuriant while the rest of the field was wiped out.

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