268 STATE HORTICULTURAL SOCIETY. 



our results, sustained by the more extended trial by Mr. Allgeo, warrant 

 this early publication of the success — or shall we say apparent success — of 

 our efforts here in Michigan. 



The matter is of such great importance and the expense of a trial so 

 light that we think it should be thoroughly tried by all interested, another 

 year. Let us suggest that formula No. 1 be tried when convenient, but 

 that a preliminary trial be made to see if the foliage is injured. I feel sure 

 "that it will rarely be at all injured. If injured it will show it in a few 

 hours and the quantity of soap may be reduced one half. Otherwise the 

 formula should be used as it stands. 



HOT WATER AND THE ROSE CHAFER. 



While discussing remedies for the injury done by the rose bug, we must 

 report our trial of Mr. E. S. Carman's hot water treatment. Early in the 

 season Mr. Carman sent us an advance printed slip from his paper, the 

 Rural New Yorker, stating that he had found that hot water, considerably 

 below the temperature limit of injury to the foliage, would kill the rose 

 chafer. We were requested to try this remedy and report. We made as 

 full a trial as the limited number of insects at our command would permit. 

 We found that water at the temperature of 130° F. was fatal to the chafers 

 in every case, while in no case was foliage injured by being sprayed with 

 -water below 150° F. Leaves dipped into water at 150° F. were badly 

 injured. We sprayed on a cool day and found it difficult to keep the water 

 .at the proper temperature; we think we can safely say that this remedy is 

 totally ineffective except it be used on warm days. We found on a hot day 

 at noon time, water which in the barrel was 150° F. was 145° four feet 

 from the end of a six foot hose used on a force pump. Our experiments 

 proved that we could not use a spray nozzle even on a hot day and keep 

 the proper temperature above 130° F. in actual practice. By using a com- 

 mon nozzle, we can apply the hot water sufficiently hot to kill. The hose 

 after once heated cools the water but little, and water at 150° F. in the 

 tank or barrel, will still be above 130° F. several feet from the end of the 

 hose. From our limited experiments on the beetles and quite extended 

 •experiments with hot water, we are led to hope that on hot days, by using 

 a common, not a spray nozzle, we may be able to fight the rose chafer suc- 

 cessfully with hot water. We would take two barrels of water in our wagon, 

 one boiling hot, the other at 150° F. By dipping from the former into the 

 latter we could easily keep it at the desired temperature. While we look 

 with hope upon this treatment, we look with more favor on the kerosene 

 emulsion, which to make assurance doubly sure may also be hot, when we 

 would combine both agents in the work of destruction. We also tried 

 hot water on the squash bug, Anasa tristis, but with no success. It 

 requires 165° F. to kill them, while 150° F. kills the plants. 



FIGHTING THE HOLLYHOCK BUG. 



Last year and this our hollyhocks were attacked by a green bug, 

 Orthotylus (Psallus) delicatus Ufil. We find this attacks the hollyhocks 

 -worse than any other plant, though we find it also on the common mallow. 

 We therefore call it the hollyhock bug. 



As we do not know of any description of this bug in any bulletins, 

 reports, or accessible treatises on economic insects, we give the following: 



