10 MAINE AGRICULTURAL EXPERIMENT STATION. 



are found on the pear, plum, currant, dogwood, elm, maple and 

 a number of other trees and shrubs. 



In June the eggs hatch, the active young appearing as small 

 white specks which soon attach themselves to new shoots by 

 their beaks. The scale then begins to form, gradually increas- 

 ing in size. The scale of the female (fig. 3, a, b, c)is less than 

 one-eighth of an inch long, narrow, usually curved when not 

 crowded, (fig. 3, c) and nearly the same color as the bark upon 

 which it is found. The scale of the male (fig. 3, d) is much 

 smaller, less curved and usually not found on fruit trees. As 

 with the San Jose scale the adult male is provided with both 

 wings and legs while the female, remaining under the scale, has 

 neither. A fuller treatment of this insect will be found in 

 Circular No. 121, Bureau of Entomology, which may be 

 obtained upon request from United States Department of Agri- 

 culture, Washington, D. C. 



REMEDIES. 



This insect is quite resistant to the application of most sprays 

 unless it be put on at the time when the young appear, before 

 the formation of the scale. This is about the middle of June, 

 though the exact date cannot be given as it varies with latitude 

 and temperature. As soon as the young larvae are observed an 

 effective remedy will be found in . "Black Leaf 40" tobacco 

 extract, f of a pint in 100 gallons of water, adding 3 pounds of 

 soap to each 50 gallons. 



The method of control found most practicable in commercial 

 orchards is the thorough application of lime-sulphur (dormant 

 strength) in the autumn after the leaves fall or in the spring 

 before growth begins. 



San Jose Scale. 

 (Aspidiotus perniciosus. ) 

 The San Jose which is one of the worst insect pests of 

 orchards in other states was discovered in the town of Lim- 

 erick, Maine, in 1909. As there is always a danger of its 

 introduction upon nursery stock from neighboring states, the 

 observation of small circular scales about the diameter of a 

 pin head (fig. 4) upon the twigs of fruit trees should imme- 

 diately be reported. 



