78 



MASS. EXPERIMENT STATION BULLETIN 353 



in the spring before the buds begin to swell, will give satisfactory control. It 

 must be remembered, however, that oil sprays, if not properly applied, are apt 

 to burn the twigs and bark, and in the case of evergreens the needles also. The 

 bloom is usually removed from the needles of evergreens but unless the needles 

 are actually burned the natural color eventually returns. To reduce the chances 

 of spray burn, follow the manufacturer's directions carefully. Do not apply when 

 the temperature is below 40° F. or when a freezing temperature may occur before 

 the spray dries. Apply only enough spray to give a thorough coverage, and as 

 an added precaution do not apply more than once in three years to needle-bearing 

 evergreens. 



Bourne, A. I., and Whitcomb, W. D. Mass. Agr. Exp. Sta. Bui. 339:46-47. 1937. 



Britton, W. E., and Friend, R. B. Conn Agr. Exp. Sta. Bui. 369:296. 1935. 



Ewing, H. E. Oreg. Agr. E.xp. Sta. Bui. 121. 1914. 



Garman, P. Conn. Agr. Exp. Sta. Bui. 252. 1923. 



McDaniel, E. I. Mich. State Coll. Ext. Bui. 76:11-12. 1929. 



McDaniel, E. I. Mich. State Coll. Ext. Bui. 175:23-24. 1937. 



McGregor, E. A., and McDonough, F. L. U. S. Dept. Agr. Bui. 416. 1917. 



Miller, A. E. Ohio Agr. Exp. Sta. Bui. 386:102-104, 105-108. 1925. 



Web Formed by Mites on Spruce Twigs. 

 Courtesy, Conn. Agr. Expt. Station. 



