140 STATE HORTICULTURAL SOCIETY. 



I know many of you think that sncli a procedure is unpractical or im- 

 possible but I want to tell you, gentlemen, that if this disease is not 

 checked pretty soon, most of the pear orchards and a great many apple 

 trees will go the way some of the Avestern orchards have gone. A couple 

 of years ago one western man had |G,000.00 worth of trees cut from his 

 orchard, this year another orchard of 1(50 acres had about 15 acres of 

 trees left when the workmen finished. 



^'I want to call your attention to this chart which shows a little bit 

 about the mixing of spraying materials. I do not know as you can get 

 much good from it as it requires considerable study. I might say that 

 I deserve no credit for getting Ihis chart up as it Avas prepared by Pro- 

 fessor G. E. Gray of the California Agricultural College and he has out- 

 lined here the way different spraying materials should or should not be 

 mixed. We sometimes find that s])raying materials may be mixed to- 

 gether and we get better results ihan if we ap])lied them separately. 

 On the other hand, two very good si)raying materials may be mixed and 

 no results obtained at all. Sometimes the mixture of materials makes 

 a very dangerous combinalion so you can realize that this matter has 

 to be handled carefully and intelligently. 



You will notice the letters on the chart indicate the different classes of 

 mixtures. It has been found that Paris green and Bordeaux will mix 

 well together and no injury follow because if there be any soluble arsenic 

 in the l*aris Green, the lime in the Pordeaux counteracts it. Paris (Jreen 

 and Lime suljvhur do not mix together well and this combination burns 

 the foliage. It is questionable whether Paris Green and Tobacco can 

 be mixed together; Ave are not sure about it but Ave do know it is danger- 

 ous to mix Paris Green Avifh soap or Avith kerosene or any of the other 

 oils. Calcium arsenite is not a suitable compound to mix with Lime- 

 sul])hur because of the possibility of its containing some water soluble 

 arsenic. It may be mixed with Bordeaux mixture because the lime 

 counteracts the acidity. Calcium Arsenite should not be mixed Avith 

 Lime-snlplnu' but may be mixed Avith Iron Sulphid. It can also be mixed 

 with tobacco. In using Lead arsenate either acid or neutral, it may be 

 mixed Avitli Bordeaux mixture. 



Q. IIoAv can Ave tell the difference betAveen acid and neutral? 



A. You Avill have to depend upon Avliat a chemist says after a chemi- 

 cal analysis. 



Mr. White: It is questionable whether Lime-sulphur and Bordeaux 

 mixture should be mixed. Lime-sulphur and tobacco may be mixed but 

 the addition of soap is questionable. In every case I have knoAvn around 

 the state Avhere they have all been mixed, i. e. Lime-sulphur, Arsenate of 

 lead and tobacco and soap, pretty soon a Aery muddy, slimy material 

 forms. There might not be any disastrous results but as I say, the 

 mixture Avill clog the spraying machine. Then Ave see Lime-sulphur mixed 

 Avith kerosene Avould be A'^ery disastrous. 



Q. Then we will have to use the Lime-sulphur and Tobacco Avithout 

 soap ? 



A. Yes. Tobacco extract is more or less questionable if mixed Avith 

 Bordeaux. It may be mixed Avith Lime-sulphur and Avith Iron Sulphid. 

 Tobacco and kerosene serve the same purpose and so far as I knoAV, 

 molasses may be mixed with any of these materials except Calcium and 

 Zinc Arsenite. In Oregon they have found it very undesirable to mix 

 molasses Avith Zinc Arsenite. 



