56 MASS. EXPERIMENT STATION BULLETIN 353 



the application of well-rotted manure, ammonium sulfate, sodium nitrate, potas- 

 sium chloride, superphosphate, bonemeal, and lime to treated soil, inorganic 

 fertilizers should be applied with care to avoid superficial injury to the foliage. 

 The application of lime to poisoned turf is not recommended because it reduces 

 the insecticidal value of the treatment. Lime should be used only when necessary 

 to correct the acidity of the soil. 



On turf where a compost of soil and manure is occasionally spread over the 

 surface, it is necessary to avoid forming a layer of unpoisoned soil in which the 

 grubs can survive near the surface of the ground. Therefore 2 pounds of lead 

 arsenate should be added to each cubic yard of top dressing. 



Control of grubs in flower gardens. — Grubs occasionally attacking the roots of 

 plants in flower gardens have been destroyed by applying a carbon disulfide 

 emulsion to the soil. This may be mixed in the proportion of 1 part by volume 

 of resin fish oil soap, 3 parts of water, and 10 parts of carbon disulfide. Two 

 quarts of this mixture are added to 100 gallons of water and applied to the in- 

 fested soil at the rate of 3 pints to 1 square foot of surface. The application 

 should be made in the late fall or early spring when the plants are not growing 

 actively. An ordinary sprinkling can may be used on small areas. 



Supplementary control measures. — To supplement spraying and soil-treating 

 operations, traps are often set to reduce the number of beetles present in a locality. 

 The traps are baiced with a mixture of 10 parts of geraniol and 1 part of eugenol 

 to attract the beetles. Another method of reducing the number of beetles is to 

 jar them from heavily Infested plants before 7.00 a. m. when the temperature is 

 low and the beetles are sluggish. They fall readily then and may be caught in 

 sheets spread beneath the plants and killed by being dropped into a can con- 

 taining kerosene and water. It should be remembered that reducing the beetle 

 population is only an auxiliary measure in combating this insect; main reliance 

 should be placed on spraying the foliage and treating the soil. 



Fleming. W. E. Preventing injury from Japanese and Asiatic beetle larvae to turf in parks and 



other large areas. U. S. Dept. Agr. Circ. 403. 1936. 

 Fleming, W. E., and Baker, F. E. The use of carbon disulphide against the Japanese beetle. 



U. S. Dept. Agr. Tech. Bui. 478. 1935. 

 Fleming, W. E., and Metzger, F. W. Control of the Japanese beetle on fruit and shade trees. 



U. S. Dept. Agr. Circ. 237. 1932. 

 Fleming, W. E., Metzger, F. W., and Osburn, M. R. Protection of orchard and shade trees and 



ornamental shrubs from injury by the Japanese beetle. U.S. Dept. Agr. Circ. 317. 1934. 

 Fleming, W. E., Metzger, F. W., and Osburn. M. R. Protecting plants in the home yard from 



injury by the Japanese beetle. U. S. Dept. Agr. Circ. 326. 1934. 

 Fleming, W. E., and Osburn, M. R. Control of larvae of the Japanese and Asiatic beetles in lawns 



and golf courses. U. S. Dept. Agr. Circ. 238. 1932. 

 Hadley, C. H., and Hawley, I. M. General information about the Japanese beetle in the United 



States. U. S. Dept. Agr. Circ. 332. 1934. 



June Beetles, or White Grubs 



Phyllophaga spp. 



These insects, of which there are several species, cause two kinds of injury. 

 The immature insects, known as white grubs, cause the more serious damage by 

 feeding on the roots of lawn and pasture grasses, certain field crops, some garden 

 plants, and nursery plantings, especially young conifers. The adults, commonly 

 known as June or May beetles, eat the leaves of oak, ash, hickory, poplar, elm, 

 willow, locust, hackberry, walnut, and other trees. Unlike the grubs, the beetles 

 of different species differ, as a rule, in their preferences for host plants. The 



