The Grape Root-Worm. 35 



much longer and there is not the danger of burning the leaves with 

 a strong mixture that there would be from using Paris green and 

 similar poisons. Use 2 or 3 pounds of tlie arsenate of lead in 150 

 gallons of water. Spray infested vines hetween the '25tli of June 

 and July loth ivith a strong poison to kill as many of the beetles 

 as 2)ossihle before they lay their eggs. 



Efforts w^ere made in Ohio to kill the beetles on the vines with 

 kerosene emulsion of various strengths but it was of no avail and it 

 spotted the fruit very badly. Whale oil soap w^as also tested, but it 

 neither killed the beetles nor acted as a repellant to drive them 

 away. They also had poor success in driving away the beetles with 

 an application of a strong Bordeaux mixture. 



The eggs of the insect can be killed wdth kerosene emulsion but 

 only a comparatively few eggs on a vine can be reached with a 

 spray, they are so snugly tucked under the bark, and the emulsion 

 also spotted the fruit. Thus^ no practicaHle method of reaching 

 the pest in the egg stage has heen devised. 



As the newly-hatched grubs drop to the ground and do not crawd 

 down the vine, there is no chance to capture them ^\\t\\ a band of 

 tar or some other adhesive substance placed around the vine. It was 

 thought that air-slacked lime scattered along under the vines might 

 kill the young grubs that fell upon it, but it proved ineffectual. 



When the grubs once get into the soil, like all insects which work 

 underground, it is usually a difficult and expensive matter to kill 

 them. Many efforts have been made in Ohio to reach these grubs 

 feeding on the roots. It is possible that if a gallon or two of kero- 

 sene emulsion be poured into a basin-like cavity around the base of 

 the vine and then thoroughly washed in with water, that many 

 young grubs might be killed during the latter part of July, but this 

 method would not be found practicable in many places and has not 

 yet been proven effective. 



Tobacco dust was thoroughly tested in Ohio in amounts ranging 

 from one-half pound to four pounds placed about the base of each 

 vine, but apparently no grubs were killed. Similar extensive 

 experiments with kainit, using from one-half pound to eight pounds 

 to each vine, showed that while this fertilizer will penetrate the soil 

 to a depth sufficient for all practical purposes, it can hardly be 



