VEGETABLE DISEASES GROUND TABLE 



205 



Dr. E-EDDick: I can cover with dust absolutely. The question 

 is to find some way of making this stay on. 



]Mr. Greffrath: Is there a machine which will apply that on a 

 large scale? 



Dr. Reddick: Yes. With the narrow strips you have, you can 

 straddle the ditch and cover the whole field. It is surprising how that 

 dust will carry. 



Mr. Greffrath: Who makes a dust machine? 



Dr. Reddick: There are only two machines that I know of, 

 one made by the Kansas City Dust Sprayer Manufacturing Company, 

 and the other by the Childs Company of Utica. 



Professor Whetzel: I might say another word about onion 

 mildew. That was one of the first propositions I tackled, and I put 

 in hard work for two years. It always seemed to me that there must 

 be some way of controlling that disease, and if we could control it, we 

 would increase the average yield one-quarter to one-half. My 

 observation satisfied me that the reduction of yield the onion growers 

 complained of was largely due to that disease. Many men did not 

 know they had the disease. It came on rather late, and cut down the 

 growth tremendously. My observation is that every season we 

 have been looking for this disease we have found it. So far as the 

 disease end is concerned, the blight is the biggest. 



Mr. Cook: Is there anyone here who has been troubled badly 

 with onion thrips? 



Mr. Greffrath: I was informed last fall by an agent that the 

 Alphonso Company, composed of two young men from South Lima 

 who are operating successfully on a large scale at Great Meadows, had 

 sprayed for onion blight with good results. I asked them what they 

 did and how they did it. They said the man that informed me was 

 mistaken. Blight had never bothered them much, but thrips was 

 their great trouble. They said last year they sprayed with kerosene 

 emulsion. They used a soap sticker, and had marvelous success. 



Dr. Reddick: I have seen Professor Herrick's onion experi- 

 mental work. The difficulty was not to kill the thrips, but to hit 

 them. Where the top had broken over, one would always find some 

 left. 



