36 BULLETIN 250, U. S. DEPARTMENT OF AGRICULTURE. 



gallons of water. It should be applied as soon as the trees come into 

 full leaf and will assist materially in controlling the codling moth. 

 Improved methods of management and care of the trees will do much 

 to decrease the danger from this pest. Hollow trees should be filled 

 or cut, and all rubbish that will furnish convenient quarters in which 

 the moths may deposit their eggs should be cleaned up and burned. 



If the orchard infestation is serious, creosoting egg clusters and 

 banding the trees with tanglefoot may be necessary. 



During the past year a number of cases of severe injury to cran- 

 berries have been observed. This was caused by feeding of the cater- 

 pillars on the tender growth and cutting off the fruit buds and blos- 

 soms, which resulted in a serious decrease in the yield. 



It is probable that this insect will not increase in sufficient numbers 

 in cranberry bogs to kill the vines, and it has, therefore, been con- 

 sidered as able to survive on this plant (Class III). The money loss 

 on account of diminution in jdeld is likely to be serious. 



THE CITY PROBLEM. 



On home grounds, in cities and parks, or on street or shade trees, 

 this problem requires the expenditure of large sums of money if 

 species favorable for the development of gipsy-moth caterpillars are 

 to remain. Not only must the insect be reduced, so that injury to 

 the trees will not result, but the caterpillar nuisance must be abated, 

 particularly in the residential sections. 



When future plantings are made, species should be selected which 

 will not require a constant expenditure of money in order to keep 

 them free from the moths. The lists given will furnish a guide in 

 this respect. 



INDEX OF FOOD PLANTS USED IN THE EXPERIMENTS. 



Page. 



Alder, Spreckled (Alnus incana [L.] Willd.) 6 



Apple {Pyrus malus L.) 6 



Arbor Vitae {Thuja occidentalis L.) 6 



Arrowwood (Viburnum dentatum L.) 26 



Arrowwood, Maple-leaved (Viburnum accri folium L.) 26 



Ash, Black (Fraxinus nigra [Marsh.]) (! 



Ash, Blue (Fraxinus quadrangulata Michx.) 6 



Ash, Mountain (Pyrus americana (Marsh.) D.C.) 7 



Ash, Red (Fraxinus permsylvanica Marsh.) 7 



Ash, White (Fraxinus americana L.) 7 



Aspen, American (Populus tremuloidcs Michx.) -'2 



Aspen, Large-toothed (Populus grandidentata Michx.) 23 



Azalea, Flame (Azalea lutca L.) 7 



Azalea, White (Azalea viscosa L.) 7 



Balm-of-Gilead (Populus balsamifcra L.) 23 



Barberry, European (Bcrbcris vulgaris L. ) 7 



Bayberry (Myrica carolinensis Mill.) 7 



