84 BULLETIN 351^ U. S. DEPARTMENT OF AGRICULTURE. 



Table XLIV. The first 4 experiments were made with self-boiled 

 lime-sulphur, 8-8-50, and were applied with coarse nozzles at a 

 pressure of 100 pounds. 



In experiment 1 the application was made May 24, when 95 per 

 cent of the overwintered scales were mature. This spraying was both 

 extensive and thorough, but was inefficient against the mature 

 females and failed to control the sooty molds. Experiment 2 was 

 directed against the larvae during the beginning of the leafward migra- 

 tion, but gave an efficiency of only 15 per cent and also failed to 

 control sooty molds. 



In experiment 3 two applications were made, the first at the be- 

 ginning of the leafward migration and the last when 95 per cent of the 

 larvae were upon the leaves. Both sprayings were ineffective and 

 the small mortality (6.3 per cent) came entirely from the first appli- 

 cation. 



In experiment 4, 3 applications were made, when the leafward 

 migration started, when 95 per cent were upon the leaves, and just 

 before the twigward migration. These applications were also ineff- 

 fective, and the mortality was no greater than in the case of experi- 

 ment 1. The fungus was partly controlled, but the fruit was coated 

 with lime to such an extent that the general effect was injurious 

 rather than beneficial. 



In experunents 5 and 6 tobacco extract was added to the seff- 

 boiled lune-sulphur, and the applications were made when 95 per 

 cent of the larvae were upon the leaves. These experiments gave no 

 better results than the preceding ones and showed that tobacco 

 extract is inefficient, at the strength used, when applied against the 

 larvae when they are upon the leaves. 



In experiment 7 self-boiled lime-sulphur was modified to increase 

 the thickness of the coating, and was directed against the young 

 females. The branches of the young twigs were coated just before 

 the females started their twigward migration. This experiment was 

 ineffective. 



Experiment 8 was made to test the smothering properties of 

 Paris white and glucose. The application was made with a barrel 

 pump, just before the females started migrating to the twigs. The 

 spray was ineffective. 



In experiment 9 a thick whitewash,, to which casein had been 

 added, was applied just before the young females started the twig- 

 ward m,igration. The Ihnbs were heavily coated, but the scales were 

 not killed. 



In experiment 10 pulverized china clay was used. It proved to 

 be a poor coating material and was inefficient. Considered as a whole 

 the experiments in Table XLIV indicate that self -boiled lime-sulphur 

 is ineffective when applied at the time of the twigward migration, 



