GYPSY AXD BROWN-TAIL MOTHS AXD THEIE COXTKOL 



21 



nozzle, it is possible to spray thoroughly trees from 60 to 100 feet 

 high. By using the same type of machine under reduced pressure 

 and attaching to the nozzle a device known as a spreader, low growth 

 may be treated rapidly and satisfactorily. 



Tests haYe been made during several seasons with airships, both 

 heavier-than-air and dirigible types, to determine whether infested 

 woodland areas could be dusted satisfactorily and economically. 

 Tins method has not proved entirely satisfactory up to the present 

 time. During the past year spraying with an autogiro has been tried, 

 and the results have been more promising. This method has not yet 

 been perfected sufficiently, however, to warrant its general adoption 

 for woodland spraying, although for applying dust insecticides on 

 certain low-growing crops it has given excellent results in some sections 

 of the country. 



METHODS TO BE APPLIED IN ORCHARDS 



Of the fruit trees, apple trees are the most likely to be infested 

 with this insect, and some injury to peach trees lias been noted. 



Figure 9. — High-power truck sprayer. 



Apple orchards that are sprayed with lead arsenate for the control of 

 other insects are protected from the gypsy moth. If systematic care 

 or spraying of the orchard is not the practice, a program consisting of 

 the removal of deadwood and defective trees, treatment of egg clus- 

 ters, and spraying with lead arsenate and fish oil shortly after the 

 blossoms fall should be put into operation. Orchards that are in 

 close proximity to infested woodlands are sometimes severely damaged 

 as a result of dispersion of small caterpillars by the wind or migration 

 of the larger ones. This can be prevented for the most part by proper 

 care of the surrounding woodland. 



PROTECTION OF SHADE, ORNAMENTAL, AND ROADSIDE TREES 



Protection of shade, ornamental, and roadside trees is vital to the 

 communities and rural districts in which they grow, as they increase 

 property values. In most thickly settled communities, when street 

 planting has been done in recent years, maple, elm, and other varie- 

 ties that are not favored by the gypsy moth have been planted, but 



