376 



STATE HORTICULTURAL SOCIETY. 



b. The foliage of egg-plants is the only foliage which was not injured by 

 any of the combinations. 



II. EXPERIMENTS ELSEWHERE. 



It may be well to state in addition to the preceding experiments what 

 work has been done at other stations in regard to the combinations of 

 insecticides and fungicides. Several stations have carried on experiments 

 in this line and the results obtained should be well known to every fruit- 

 grower. Weed of Ohio was probably the first to do practical work in this 

 line. In Vol. iii, p 263, of Agricultural Science he says: "Among the 

 substances tested, mention may be made of copper sulphate and London 

 purple for blight and beetles affecting potatoes; soda hyposulphite and | 

 London purple, and potassium sulphide and London purple for apple scab 

 and codlin moth, copper sulphate and London purple for plum-fruit rot 

 and curculio, and several other similar experiments, the results of which 

 will be duly reported in the bulletin of our station." I can find no 

 detailed account of these experiments in the Ohio bulletins, although it 

 appears that satisfactory results were obtained. In 1890 a combination of 

 the ammoniacal carbonate of ammonia, 25 gallons, and Paris green, 3 

 ounces, was applied to the foliage of apple, cherry, grape, pear, quince, 

 and potato. The application was made June 21, and June 27 no injury to 

 the foliage could be seen. 



Experiments with combinations of the Bordeaux mixture and arsenites 

 have been made by Gillette. The table shows the effect of applying lime 

 with Paris green and London purple: 



The numbers show the average percentages of injury done to the foliage 

 of plum, apple, cherry, peach, alder, locust, poplar, grape and squash. It 

 will be noticed that the addition of lime reduced the injury in a marked 

 degree. 



Similar experiments were carried on with white arsenic, but entirely 

 different results were obtained. The injury done when lime was added in 

 applying white arsenic, was from three to twenty times greater than when 

 lime was not used. 



Since the Bordeaux mixture contains a large excess of lime, the above 

 results may also apply when this fungicide and the arsenites are used 

 together. In fact Gillette found that " London purple (Paris green and 

 white arsenic have not yet been tried) can be used at least eight or ten 

 times as strong without injury to foliage if applied in common Bordeaux 

 mixture instead of water." 



Clark, of Missouri, carried on experiments in the use of Bordeaux mix- 

 ture and Paris' green in combination to determine the value of the mixture 



