362 THE MONTHLY BULLETIlSr. 



A ]Member. Why are red spiders more numerous along roadsides 

 than in orchards? 



Mr. VoLCK. I do not know as I have any satisfactory explanation 

 for that. I always thought that it might be due to the influence of 

 dust settling on the trees, but 1 couldn't say that this has anything to 

 do with it. 



Mr. ScHULZ. When is the best time to spray for the citrus red 

 spider? 



]Mr. VoLCK. I do not know about all parts of the State — about how 

 often they should be applied in the Sacramento and San Joaquin valleys, 

 but in the southern part of California, the proper time to spray for the 

 citrus red spider is in the month of August. Use sublime sulphur with 

 Hour paste, and you can also use the lime-sulphur solution, if you wish. 



Mr. Chapman. You say to spray before they come; how are you 

 going to tell when they are coming? We can't go out and find out 

 about these things. When they appear Avon't it be time to go after 

 them ? 



Mr. VoLCK. That is an entirely wrong way ; spray regularly in your 

 orchard ; go over the ground very carefull}^ with your sprays. 



Mr. Chapman. You know that is impracticable. 



Dr. Cook. When I came from Michigan about twenty-five years ago 

 the people were just commencing to spray for certain fungous diseases 

 and troubles there. Now and then they would spray, waiting until 

 there were evidences of attack, then they would spray ; but that caused 

 great trouble and now they don't hesitate, they spray every year. I 

 agree with ]\Ir. Volck. 



Mr. Chapman. Suppose you have red spider onlj- once in five years. 

 AYould you go through your orchards and spray every year? 



Mr. Volck. They should be sprayed in advance rather than after 

 the red spider has appeared. 



My. Pease. Mr. Volck has stated that it does not alwaj^s appear. 

 Perhaps this year may be bad and next year we may not have trouble 

 at all. Would you spray whether the spider was there or not? 



Mr. Volck. Yes. 



Dr. Cook. I believe that is the most important thing that will be 

 said at this convention. Mr. Teague of the Limoneira Company spent 

 between five and six thousand dollars last year in firing his orchards for 

 frost protection, and saved thousands on that account. 



Mr. Pease. One more question. If we haven't any spiders and 

 there are not very many eggs there, how long will the effect of your 

 spraying last? And suppose it comes later. 



Mr. Volck. One year. 



]\Ir. Pease. Will it kill the eggs ? 



]\Ir. Volck. The young mites will be killed when hatched from the 

 eggs if the application is put on properly. 



jMr. Pease. How long will it last? 



