113 



} on get a very efficient mixture for both scale and plant 

 lice.. 



A MEMBER : I would like to ask have you ever tried 

 soluble oil for San Jose scale? 



PKOF. FAEROTT : Yes, soluble or so-called miscible 

 oils are among the recognized efficient mixtures for the con- 

 trol of San Jose scale. Quite a few growers are using them 

 but the mass of our growers are relying on lime-sulphur for 

 several reasons. In the first place, there is no danger from 

 Ijme-sulphur as far as the trees are concerned ; then again 

 lime-sulphur has fungicidal properties and lastly you can 

 combine lime-sulphur with arsenate of lead and nicotine. 

 In the case of these commercial oils, they are all right as far 

 as the control of the San Jose scale itself is concerned, but 

 they may prove injurious to the trees in case one is delayed 

 in his spraying operations and has to spray the trees when 

 the buds are breaking and the green tissues are showing. 

 In the case of peaches, there is no fungicidal properties in 

 miscible oil to control leaf curl, or to prevent scab on apple 

 trees. I class miscible oils among the efficient sprays for 

 the scale but one ought to understand their limitations to 

 know how to use them satisfactorily, 



I would like to ask have you ever tried them for green 

 lice ? 



PROF. PARROTT : The question is can you rely on 

 miscible oil to destroy the eggs of the plant lice. We have 

 only one experiment, and while there was a certain percent- 

 age of the eggs of the aphis killed by miscible oil and by 

 various home-made emulsions, we did not get complete 

 protection for the trees. 



A ME]\IBER : I would like to knoAV the best method for 

 controlling the tent caterpillar, the brown-tail moth and the 

 gypsy moth. 



THE CHAIRMAN : It is too much for Prof. Parrott and 

 he turns it over to Mr. Frost. 



MR. FROST: I think Prof. Parrott might answer that 

 ctuestion. It is pretty difficult, anyway, because you take 



