GIPSY MOTH AND BROWN-TAIL MOTH AND THEIR CONTROL. 15 



is to be used at all the burlap should not be at tad KM! to the trees until 

 after June 15, when most of the brown-tail caterpillars will have 

 pupated. 



Tanglefoot bands. A band of tanglefoot may be used on tree trunks 

 after the bark has been scraped so that the sticky material can be 

 applied evenly in a thin layer with a paddle. The purpose of this 

 band is to prevent caterpillars from ascending the trees, and if the 

 egg clusters have previously been treated this is a very effective 

 measure. It is necessary every week or 10 days during the caterpillar 

 season to run a comb or other similar implement around the band in 

 order to prevent hardening of the surface and to bring up fresh, sticky 

 material from the part of the band near the bark. (See fig. 8.) Plac- 

 ing these bands on the trees prevents the caterpillars from reaching 

 the foliage: and as the latter usually mass in large numbers beneath 

 the bands, conditions are favorable for wilt disease to develop, and 

 the caterpillars often die in large numbers from this cause and from 

 starvation. 



Spraying. The most effective spray for the gipsy moth is arsenate 

 of lead paste applied to the foliage at the rate of 10 pounds to 100 

 gallons of water. It is necessary that the treatment be thorough and 

 the application even, if best results are to be secured. For small 

 operations the ordinary orchard sprayer may be used with one or 

 more lines of hose equipped with nozzles of the Vermorel or Bordeaux 

 type. In case large shade trees on valuable park or woodland are to 

 be treated, however, the use of a high-power sprayer is more economi- 

 cal. The type that has given the most satisfactory results in the 

 gipsy-moth work develops sufficient power to throw a solid stream of 

 spray into the trees. The nozzle is constructed so that the stream will 

 break into a fine mist high in the air, and this results in very satis- 

 factory and rapid treatment. (See fig. 9.) With such a sprayer it 

 is unnecessary to climb trees and use small lines of hose, which is a 

 ow and expensive operation. A satisfactory high-power sprayer 

 for this work should be equipped with a 10-horsepower gasoline 

 engine and a triplex pump capable of delivering 35 gallons of liquid 

 per minute at a pressure of from 200 to 250 pounds. This machinery, 

 together with a 400-gallon tank, should be mounted on well-built 

 trucks. One-inch hose is used, and with the outfit mentioned the 

 spray material can be conducted through several hundred feet of this 

 hose without seriously reducing the nozzle pressure, which should be 

 maintained at about 230 pounds. 



HAND METHODS TO BE USED AGAINST THE GIPSY MOTH IN 



ORCHARDS. 



The methods to be used for controlling the gipsy moth in orchards 

 should be based largely on the severity of the infestation. If only a 



