MAINE AGRICULTURAI. EXPERIMENT STATION. IQ 



cular 468, and add 2 to 3 pounds of arsenate of lead paste to 

 each 50 gallons of spray when ready for'use. This is for apple 

 scab, leaf-spot, rot, bud moth, canker worm, tent caterpillar and 

 forest caterpillar. 



C. Repeat B as soon as the blossoms have fallen for the 

 same parasites and for codling moth. 



D. Repeat application B again in ten days or two weeks 

 after application C. 



E. If the season is very wet and favorable to apple scab, or 

 bitter rot or black rot are present to any extent, later applica- 

 tions of the summer dilutions may be required. In these the 

 arsenate of lead may be omitted unless caterpillars or other 

 leaf eating insects are present. 



Add black leaf 40 for aphids in B., C. and D. 



Aphid Control. In recent years tobacco extracts have rapidly 

 taken the place of other remedies for aphids, and well informed 

 apple growers are using them almost to the exclusion of other 

 insecticides. It should be remembered that this is a contact 

 insecticide and kills only the insects actually touched. It is, 

 therefore, necessary to be very thorough in the spraying. Direc- 

 tions for using both the home made extracts and reliable com- 

 mercial products such as Black Leaf 40 are given in Circular 

 483 on Aphids. These sprays are also valuable in combatting 

 the oyster shell scale at the time the young are crawling in the 

 spring. The tobacco extracts can be applied at the same time 

 and with the sprays for chewing insects and for fungi. 



August Sprays for Brozvntail and other Caterpillars. Six 

 species of caterpillars work damage in Maine orchards in 

 August. Each is a serious pest during a season favorable to 

 its development, and all six may be present in abundance the 

 same year. This is not so discouraging as it seems at first 

 thought because one thorough spray of arsenate of lead will 

 ordinarily control all the August caterpillars which chance to be 

 present. 



Such a spray would probably be most effective if applied 

 about the middle of August in Maine. The time may vary, 

 however, a week or two according to seasonal variation as to 



* Bordeaux mixture can be used on the varieties not susceptible to 

 bordeaux iniurv. 



