192 



adjoining perennial multiplier onions, but was checked by the applica- 

 tion of nicotine sulphate soap by means of a Hardie barrel sprayer 

 with hose extension. Other sources of infestation were cucumbers 

 grown during the winter in greenhouses, and refuse piles, or anything 

 that would afford shelter to the hibernating adults. The destruction 

 where possible of these hibernating places is one of the chief factors 

 in the control of T. tabaci, although it is apparently frequently 

 neglected. 



Snyder (T. E.). U.S. Bur. Ent. White-ant-proof Wood for the 



Tropics. — Jl. Econ. Ent., Geneva, N. Y., xiv, no. 6, December 

 1921, pp. 496-501. 



To protect cabinet woods from the attack of termites they should 

 be impregnated with chlorinated naphthaline (a crystalline wax) by 

 placing the wood in open vats containing the wax at a temperature of 

 from 220-240° F. without previous drying of the wood. The time 

 required for impregnation depends on the dimensions of the wood, 

 that half an inch thick requiring only fifteen minutes. After the wood 

 is removed from the vats, it should be carefully dried with a cloth to 

 insure the proper adherence of shellac or varnish. Wood thus treated 

 is slightly darker than the untreated wood, but is termite- and damp- 

 proof. Susceptible North American hardwoods treated in this manner 

 were not attacked after being buried in the ground for over three years 

 with logs infested with Reticulitermes spp. 



Construction timbers, or other timbers which are to be in contact 

 with the ground, should be impregnated with coal-tar creosote, which 

 is a permanent preventive against the attack by native termites. 



Mercury bichloride and zinc chloride are effective for the impreg- 

 nation of woods that are not to be in contact with the ground, and 

 would be suitable for the treatment of cheap, perishable woods to be 

 used as the core over which termite-proof veneers could be glued. 



Wood pulp products may be made termite-proof by adding poisons 

 such as mercury bichloride or carbolic acid during the process of 

 manufacture. Coal-tar creosote is also effective for this purpose, but 

 can only be used where the brown stain and odour resulting from it 

 are not objectionable. 



Pines are generally most susceptible to attack by termites, with 

 the exception of certain species, such as the longleaf pine [Pinus 

 palustris) of the Southern United States, the heart wood of which is 

 extremely resinous. Certain red cedars {Junipenis spp.) also appear 

 to be distasteful to termites. A list is given of the distribution in the 

 United States, and the relative resistance, of various native woods which 

 might be used as veneers over chemically treated woods, or in ply or 

 laminated woods. 



JoxES (T. H.). Opisthuria clandestina var. dorsalis, Knight, injurious 

 to Legumes. — Jl. Econ. Ent., Geneva, N. Y., xiv, no. 6, December. 

 1921, p. 501. 



The Capsid bug, Opisthuria clandestina var. dorsalis. Knight, is 

 recorded as injuring cowpeas. pole beans and soy beans in Louisiana. 

 Nymphs were numerous on the leaves in July, causing the appearance 

 of white spots. 



