MONTANA EXPERIMENT STATION. 253 



in form, occurrint;" on varions plants but mostly on apple, on which 

 it is most abundant at the ends of the twij^s. 



Remedy. — Watch for the e.xceedinf^ly minute whitish larvae 

 early in June and when they appear spray with kerosene emulsion, 

 one ]^-Av{ in nine o^* water. Repeat in a few days if more lar\ae art} 

 seen. 



i6, Putnam's Scale Insect. 



This insect occurs sparingly in western Montana. Resembles 

 the San Josje scale, being a degraded form of life that lives under 

 a very inconspicuous scale closely adhering to the bark. 



Remedy. — If necessary to treat for this, wash with strong whale 

 oil soap solution while the trees arc dormant. 



17, The Scurfy Bark-louse. 



A white scale insect on the bark of apple, pear, currant and 

 other rosaceous plants. 



Remedy. — Watch for the young to hatch early in June and 

 spray with kerosene emulsion, one part in nine of water. If neces- 

 sary spray again ten days later. 



18, Mealy Bug on Apple and Pear.* 



Occurs in the vicinity of Missoula. White cottony or mealy 

 masses around the buds in the spring. Found in the winter under 

 the scales of bark. Has been reported as injurious to young trees. 



Remedy. — Use whale-oil soap or kerosene emulsion as strong as 

 the trees will stand. In the winter search for and destroy the cot- 

 ton}- masses on the trunks of the trees, using whale-oil soap as 

 a wash. 



19, Ants as Fruit Pests. 



W^e have received reports of ants as being injurious to young 

 friut trees, building their mounds at the bases of the trees and eating 

 off the bark and girdling the trunk. We have also known ants to be 

 injurious to apple trees by gnawing the buds in the spring of the 

 year. 



Remedy. — Pour bi-sulphide of carbon into the colonial mounds; 

 from one to live or six tablespoonfuls should be enough. This sub- 

 stance must not be put close to the trunks of apple trees. 



*Phenacoccus fip. 



