New York Agricultural Experiment Station. 333 



(1) The application of poison or repellants to the willows, 

 either dry or mixed with water. — The poisons most commonly 

 used are Paris green and London purple, applied either in water 

 or mixed with lime or land plaster. Paris green and land plaster, 

 about 1 part of the poison to 40 parts of land plaster, is considered 

 an effectual remedy if applied when the willows are wet with dew 

 or rain. A solution of copper sulphate without lime, 1 pound to 

 from 7 to 12 gallons of water, has been tried by several growers 

 about Liverpool, one of the willow-growing centres near Syracuse, 

 but without much success. If applied strong enought to materi- 

 ally check the insect, it injures the willows. 



None of the above compounds have proven uniformly satisfac- 

 tory in the hands of the willow-growers. 



(2) By using machines for catching the beetles. — These ma- 

 chines are made for use with either horse or hand-power. The 

 two forms are illustrated at Plates XXI, XXII and XXIII which 

 are from photographs taken by Mr. Rogers of Liverpool, at the 

 writer's request. The dimensions of the body of the horse-power 

 machines are as follows: Length 5 feet, width of rear end 2 feet, 

 front end 1 foot 8 inches, depth 6 inches. The body thus forms a 

 shallow tank which may be lined with zinc or tin and in which kero- 

 sene oil or kerosene oil and water, the oil forming a thin film on 

 the surface of the water, should be kept while the machine is in 

 use. A number of narrow strips are placed longitudinally over 

 the top in the manner shown in Plate XXI to keep the willows 

 from touching the oil. Two stout runners fastened to the under 

 side support the tanks. Plate XXII shows the machine in posi- 

 tion ready for use. As will be observed, it is made to run between 

 the rows; the long arms which extend obliquely from eitber side, 

 cause the willows to bend over as the machine moves along and at 

 the same time rub off the beetles and many of the larvae and pupae 

 which drop into the tank and are quickly killed by the oil. A 

 lighter machine for hand-power is shown at Plate XXIH. 



