SPRAYING FOR THE CITRUS MEALY BUG 251 



The mixtures used were as follows : 



(1) Potassium Bichromate 10 fcs. 



Water 200 gals. 



(2) Potassium Bichromate 1 tb. 



Carbolic Acid Emulsion 200 gals. 



The potassium bichromate was also added to Lime Sulfur in limited 

 quantities, but in every case it caused spotting, burning, and dropping of foliage. 

 Its use as a spray for citrus trees is therefore impractical and unwise — and the 

 experiments show this. 



TOBACCO EXTR.ACT. 



Tobacco extract and caustic soda were mixed as follows : 



Tobacco Extract ( Ky. Tobacco Co.) y^ pt. 



Caustic Soda 1 lb. 



Water to mix 2 gals. 



This stock solution was diluted 1 to 3 and applied with a hand pump. 

 The results were the poorest which were obtained and the use of the tobacco 

 extract likewise proved of no use. 



Another formula as follows was tried with no better results : 



Soap y2 lb. 



Black Leaf Yz gal. 



Water _ _ 5 gals. 



BOILED LIME-SULFUR SPR.KY. 



The effectiveness of the lime-sulfur spray as an insecticide has been well 

 demonstrated along many lines. It was therefore only natural that it should 

 be given a trial on the mealy bug. 



Accordingly a special prepared mixture was tried and gave promise of 

 such good results that the manufacture of a spray in the orchard, here, was 

 begun. It was necessary, first of all, to get a spray strong enough to kill the 

 mealy bugs. 



The most successful combination made was according to the following 

 formula : 



Unslacked Lime 50 lbs. 



Flowers of Sulfur _ 50 lbs. 



Water to mix _ 40 gals. 



The usual method of mixing the material was a.s" follows : 

 The lime, when slacked, was first added to the 40 gallons of water in the 

 iron kettle. The sulfur was then added and stirred when the water began to 

 get warm. .-Ks soon as the mixture began to boil the sulfur was thoroughly 

 mixed. All was then allowed to boil for several hours and stirred repeatedly. 

 Another method of mixing is to make a paste of the sulfur before adding it to 

 the lime and water. The mixture was strained through a fine sieve and 

 diluted 1 to 20 before using. This made it a cheap, easy spray to apply, but 

 one severe on the hands and face of the men handling the nozzles. 



