242 JJKPORT OF, OFFICE OF EXl'EHIMKNT STATIONS. 



fonimlii called for -JO poiiiuls of linu', 10 poiiiuls of siili)liiir, 10 

 poiiiuls of soiliiim .siilj)hi(l, aiul 40 gallons of ^vato^. 'J'hc least cx- 

 jH'iisivc inixtuiv, howoviT, was <)iu> c-oiitaining 20 pounds of lime, 14 

 pounds of sulpliur. and 40 <j:allons of water boiled for 45 minutes. 

 This mixture prepared icady for use cost 54 cents ]X'r 40 gallons. 



In experimenls at llic Connecticut Storrs Station excellent results 

 were obtained from (he lime-suli)hui' wash, containing 25 pounds of 

 lime, 20 pounds of sulphur, and 15 ])ounds of salt per 50 gallons of 

 water. At this station it apjx'ared that when an excess of lime was 

 used the whitewash thus })roduced by solution in water was of no 

 special advantage, and when an excess of sulphur was used some of 

 the sulphur remained undissolved. It is reconnnended, therefore, 

 that slightly more lime than sulphur should be used in order to make 

 sure that the suli)hur is all dissolved. In testing the changes which 

 take place in the mixture during boiling it was found that sulphur 

 was all dissolved when the mixture was boiled from 30 to 45 miinites, 

 and that no beneficial effects were produced by boiling the mixture 

 for a longer period. Some economy was learned in placing the lime 

 and sulphur together and pouring hot water upon the lime to slake it. 

 The heat developed by the lime in slaking is thus utilized. The addi- 

 tion of 4 poimds of copper sidphate to the fornnila used by this sta- 

 tion ])roduced one form of the Oregon wash, which gave results 

 ecpially as satisfactor}'^ as those obtained from the California wash. 

 The results obtained at the Storrs Station indicate that the California 

 wash may be applied at any time when the leaves are olf the trees, 

 from November to April. The wash may be ai)plied to all kinds of 

 orchard trees, mountain ash, rose bushes, grapevines, other small 

 fruits, and ornamental trees and shrubs liable to infestation with San 

 Jose scale. It was found that the omission of salt from the formula 

 lowered the cost of the mixture considerably. 



In Delaware" lime-sidphur washes were tested either after boiling 

 by fire or self-i)oiled by means of caustic soda. The caustic-soda mix- 

 ture gave quite favorable results, but on the whole was considered as 

 inferior to the boiled California w^ash. As a result of the experiments 

 at this station it is recommended that the sulphur should be added to 

 the slaking lime, and that the ingredients of the wash should be boiled 

 in as large an amount of water as can be conveniently used. By ob- 

 serving these precautions it is possible to get nearly all of the sulj)hur 

 in solution within 15 minutes. It is therefore recommended that 

 boiling for 15 to 30 minutes is as satisfactory as a longer period. 

 The wash shotdd be applied as soon as possible after preparation, 

 but in case it can not be applied before the crj^stals form they may 

 be strained out, redissolved in hot water, after which the solution 

 may be added to the original wash. 



« Delaware Sta, Bui. 64. 



