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Image 3 of Circular (Kentucky Agricultural Experiment Station) n. 262

Part of Kentucky Agricultural Experiment Station

CIRCULAR NO. 262 The Striped Cucumber Beetle By H. H. JEWETT This little yellow and black beetle is, perhaps, the most per- sistent and destructive insect pest with which the grower of melons and cucumbers has to contend. It may begin its attack even before the seedlings have appeared above ground, and con- tinues thru the growing season. Many remedies have been pro- posed for its control, some worthless or of little value, but ex- periments and the experience of growers have shown that the persistent use of arsenical dusts or sprays is effective. Dusts are preferred because they are easier and quicker to apply, and the necessary equipment is simpler and less costly than that for spraying. The cost of insecticides for dusting is greater than for spraying, because more material is used in dusting than in spray- ing, but the saving in time and labor makes dusting the cheaper method. The choice may depend on the equipment at hand, how- ever, and the experience of the operator. THE KIND OF DUST A mixture of one pound of calcium arsenate with 20 pounds A of landplastcr is recommended. The arsenate may be used at the rate of one pound to 15 pounds of landplaster without injury to the plants, but the weaker mixture is preferred because it is more economical. A mixture of one pound of lead arsenate with l0 pounds of landplaster may be used, but calcium arsenate is preferred. Lilndplaster is pulverized gypsum. It can be obtained from the larger dealers in agricultural supplies. Builders plaster, obtainable from dealers in builders supplies, serves as well. If it contains hair, this must be sifted out. Hydrated lime should not be substituted for landplaster, because it injures the foliage.

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