Papers on insects injurious to citrus and other subtropical fruits . solution of a density of 33° Baume should be dilutedat the rate of 1 volume to 75 volumes of water: that of a density of36° Baume should be diluted at the rate of 1 volume to 86 volumesof water. Therefore the formula for orange-thrips sprayingwould be: 14 IXSKCTS INJURIOUS TO SUBTROPICAL FRUITS. (1) Lime-sulphur (33° Baume) 1 to To and blackleaf tobacco ex-tract (2f per cent nicotine) 1 to 100; or, using blackleaf 40 (40per cent nicotine) tobacco extract 1 to 1,800. (2) If lime-sulphur of 36° Baume is used the formula would b
Papers on insects injurious to citrus and other subtropical fruits . solution of a density of 33° Baume should be dilutedat the rate of 1 volume to 75 volumes of water: that of a density of36° Baume should be diluted at the rate of 1 volume to 86 volumesof water. Therefore the formula for orange-thrips sprayingwould be: 14 IXSKCTS INJURIOUS TO SUBTROPICAL FRUITS. (1) Lime-sulphur (33° Baume) 1 to To and blackleaf tobacco ex-tract (2f per cent nicotine) 1 to 100; or, using blackleaf 40 (40per cent nicotine) tobacco extract 1 to 1,800. (2) If lime-sulphur of 36° Baume is used the formula would 1 to 80 and blackleaf tobacco extract 1 to 100; or black-leaf tobacco extract 40 (40 per cent nicotine) 1 to 1,800. To load a sprayer having a 200-gallon tank, proceed as follows:First turn water into the tank until nearly full, add 2§ gallons lime-sulphur (33° Baume) and 2 gallons blackleaf tobacco extract (2fper cent nicotine) ; or 14 fluid ounces blackleaf 40 tobacco extract(40 per cent nicotine). If the lime-sulphur is 36° Baume. use Fig. 2.—Power spraying outfit in use in spraying for the orange thrips. (Original.» gallons, and 2 gallons of blackleaf tobacco extract; or 14 fluid ouncesof blackleaf 40 tobacco extract. HOW TO SPRAY. In spraying for the orange thrips only those insects actually hit withthe spray will be killed. As this insect obtains its food by sucking theplant juices, stomach poisons are of no avail. In order to spray withgreatest efficiency it is necessary to use a gasoline power sprayer,maintaining a pressure of 180 to 200 pounds. (See fig. 2, showinga power outfit in operation.) Angles or elbows should be used on allspray rods so that overshot and undershot spraying can bedone; that is, spraying from above downward, and from below up- THE ORANGE THRIPS. 15 ward to reach the lower surface of the leaves. The trees should bedrenched until they drip freely. Especial care should be taken with the outside fruit as the thripsscar t
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