INDIANA HORTICULTURAL SOCIETY. 421 



used with Bordeaux mixture, made by the 4-6-50 formula. Five trees 

 were left untreated. All the trees had been sprayed regularly for many • 

 years. The season was a severe one for a test of remedies. In 1900 there 

 was a good crop and plenty of codling moth; while in 1901 there were 

 practically no apples on the peninsula. As a result codling moths concen- 

 trated largely in orchards bearing fruit. Five trees were sprayed twice 

 with arsenate of lead, known also as disparene. Three were sprayed 

 once only, May 15, with disparene. Five were sprayed with paris green, 

 one pound to 150 gallons Bordeaux. The droppings were carefully col- 

 lected and both good and wormy fruit counted during the season. 



The number of perfect droppings is approximately the same on all 

 trees. One spraying of disparene was as effective as two of Paris green, 

 while two of the former were much superior to the latter. This seems 

 to be very lai'gely due to the superior adhesive qualities of disparene. It 

 stuck to the leaves all summer although we had unusually numerous and 

 severe rains. We have carefully gone over the records of previous experi- 

 ments, and considering the unusual number of codling months present, 

 the check trees having 60 per cent wormy for the whole season, we be- 

 lieve that the results secured by two sprayings with disparene are the 

 best that have yet been secured in any similar experiments. 



The two sprayings with disparene resulted in reducing the number of 

 windfalls a half and increasing the perfect picked fruit by 18 per cent, 

 over those sprayed but once. A benefit of 87 per cent over the unsprayed 

 trees was thus secured as regards wormy fruit, there being but 7.8 per 

 cent, wormy during the whole season, and but 4 per cent, of those picked, 

 and a benefit of 77 per cent, as regards windfalls. The labor and Bordeaux 

 mixture for each spraying was a trifle over 2% cents per tree, including 

 the disparene. "Where Paris green was used, the cost was about 2^4 cents 

 per tree. Disparene can be made at home. It costs about 15 cents in 

 one hundred-pound lots and about 20 cents in five-pound packages. It 

 was first used in Massachusetts against the gypsy moth.— Orange Judd 

 Farmer. 



[Arsenate of lead or disparene, mentioned in Professor Sanderson's 

 article, can be easily made on the farm if desirable. The constituents are 

 (1) arsenate of soda and (2) acetate of lead. When combined they form 

 the arsenate of lead. Dissolve four ounces ai'senate of soda in three 

 quarts water and eleven ounces acetate of lead in another three quarts 

 water. It dissolves readily and can be diluted either with Bordeaux mix- 

 ture or water. In either case about one quart arsenate of lead should be 

 used for each twenty or twenty-five gallons Bordeaux or water. It should 

 be mixed as used. It can be used much stronger without danger to foliage, 

 even on peach and plum. In this respect it is superior to paris green and 

 other arsenical poisons, as it does not burn the foliage. As a rule the for- 

 mula given will do for most leaf-eating insects, and the codling moth. 

 Where rapid work is desired the quantity can be doubled; that is, use two 



