THE MONTHLY BULLETIN. 363 



Mr. YoLCK. For a year — spray regularly in August and you will 

 keep the red spider under control. 



Mr. Pease. I have not had red spider in our locality in August ; 

 they appeared in May and dispersed by the end of June. 



Mr. Chapman. One more question. Will the red spider after being 

 sprayed be exterminated completely and be introduced again? 



Mr. VoLCK. I do not claim to exterminate anything. There will 

 always be some mites left, and they will have to be sprayed again next 

 year. 



J\Ir. Jones. I would like to ask in regard to the application of dry 

 sulphur dust. Has the temperature anything to do with its effects ? 



Mr. Volck. Yes, it has considerable to do with it. Along the coast 

 we do not have very good results using dry sulphur on anything. 



Mr. Jones. If the weather is warmer, then it is more effective. Is 

 that right? 



Mr. YoLCK. Yes. 



Mr. Cl'Ndipp. Can't you control the red spider with dry sulphur 

 much cheaper than with the liquid spraying with one application? 

 Isn't it cheaper than with liquid? 



Mr. YoLCK. You might, but it won't control nearly so completely 

 as the liquid ; the dust application put on in August will have little 

 material effect in January or February. 



Mr. Cundiff. We absolutely control it in our section with one 

 application, put on much earlier, using a large machine, which dusts it 

 thoroughly over the trees, and it can be done for one eighth the expense 

 per application of the flour paste application. We use both. 



Mr. Jones. What kind of sulphur do you use. 



Mr. YoLCK. Best made of sublime sulphur. 



Mr. Pease. In using dry sulphur, don't you always depend upon 

 the heat for sticking, for making the sulphur fumes? 



Mr. YoLCK. The essential difference between dry sulphur and sul- 

 phur liquid spraj^ is that you get better adhesion with the liquid spray 

 and your material remains longer on the tree. Sulphur dusting has to 

 be effective within a short time after it is applied, for rains and winds 

 shake it off the tree; whereas if put on with flour paste it sticks there 

 and stavs for months. 



Chairman Cook. The next subject will interest you all, I am sure — 

 our laws and the nurserymen. We are favored in having so able a man 

 as is Mr. George C. Roeding to present this subject. I take great 

 pleasure in introducing to you Mr. George C. Roeding — Mr. Roeding. 



