26 CONTROL OF PEACH BROWN-ROT AND SCAB. 



BROWN-ROT AND SCAB TREATMENT. 



In orchards where curculio is not troublesome, the arsenate of lead 

 should be omitted. The treatment for brown-rot and scab on mid- 

 season varieties would then be as follows: 



(1) Three to four weeks after the petals fall spray with 8-8-50 self-boiled lime- 

 sulphur. 



(2) About three weeks later spray with the same mixture. 



(3) About one month before the fruit is expected to ripen make another applica- 

 tion of the same mixture. 



SCAB TREATMENT. 



For the treatment of scab alone, spray the trees with 8-8-50 self- 

 boiled lime-sulphur about one month after the petals drop and 

 again three to four weeks later. 



One treatment thoroughly applied one month after the petals drop 

 will so nearly control scab that in many cases a second spraying 

 may not be necessary, but on account of the way spraying is ordi- 

 narily done two treatments will usually be required, especially on 

 late varieties. 



APPLICATION OF THE SPRAYING MIXTURES. 



The necessity of keeping the mixtures thoroughly agitated while 

 spraying can not be too strongly emphasized. Both self-boiled lime- 

 sulphur and arsenate of lead settle readily, and if the spraying outfit 

 is not equipped with a good agitator the mixture will not be evenly 

 distributed and some of the trees will be oversprayed, while others 

 will receive an insufficient application. In power sprayers the pro- 

 peller type of agitator is the most satisfactory for this work. The 

 early applications of lime-sulphur may be made rather heavy, but 

 the last spraying should be made with fine nozzles, and the aim 

 should be to give the fruit a uniform coating of a mist-like spray. 

 Heavy drenching of the trees should be avoided. 



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