86 



24. Tree Barriers: 



a. Tree Tanglefoot. 



Mix with a gentle heat one pound of resin and one gallon of 

 castor oil, and when cold thin as desired with more castor oil. 

 One of the best ways to apply it is to saturate a piece of baling 

 rope with the well thinned mixture and tie around the trunk of 

 the tree. This will remain sufficiently sticky about ten days, as 

 long as anything of the kind we know of. A strip a few inches 

 wide surrounding the tree trunk, placed in the fall and tended 

 during the winter to prevent the ascent of the Canker Worm Moth. 

 Placed in Hop Vines to prevent ascent of the Hop Flea Beetle. 

 To bar Argentine Ants or most other insects that reach the fol- 

 liag by crawling only. 



b. Cotton Bands: 



A four inch strip tied round the tree by a string at the lower 

 edge, and the top then pulled down over the string is in use 

 against Fuller's Rose Beetle on the orange, and other beetles and 

 worms. See State Experimental Station Bulletin No. 214. 



c. Mosquito Wire Netting: 



This similarly applied is in use against the Canker Worm. 



d. Asphaltum : 



A strip 6 to 8 inches wide painted about base of tree trunk to 

 prevent the entrance of the Peach Tree Borer. 



25. Ground Barriers : 



A deep furrow with straight side next to the field to be pro- 

 tected will stop the progress of Army Worms. Holes 8 or 10 

 inches deep and 20 or 30 feet apart may be dug in the furrow. 

 The worms upon falling in these may be killed by pouring in a 

 small amount of gasoline and throwing in a lighted match, or oil, 

 hot water, or other means as seems desirable. 



26. Carbon Bisulphide : 



For treatment of stored products and underground insects. 

 Usual dosage, 1 pint to 1000 cubic feet space. 

 Place liquid in saucers or shallow vessels above material to be 

 treated. Inflammable; avoid lights. 



For underground insects, a tablespoonful in holes 3 or 4 feet apart. 



