28 



Bulletin 332 



line the percentage of eggs showing a split outer shell at the time 

 the treatment was given. The average percentage of hatch, 48 

 per cent, or percentage of dead eggs, 52 per cent, for the untreated 

 eggs, or checks is represented by a straight line. 



Diagram 1. Chart showing progressive decrease in the percentage 

 of hatched eggs or increase in the percentage of dead eggs with the 

 various sprays when they are applied nearer the time when tlie nymphs 

 emerge (Emergence March 21 to April 5). 



a — Lime-sulfur, 1-9 



b — Lime-sulfur, 1-9 plus nicotine. 



1-500 

 c — "Scalecide," \-\^ 

 d — "Scalecide," 1-40 plus cresol. 



1% 

 e — "Scalecide," 1-15 plus crude 



carbolic, 1% 

 f — F. o. soap, 1 gm.-5 c. c. plus 



phenol, !<}'( 

 g — F. o. soap, 1 gni.-5 c. c. plus 



nicotine, 1-5 00 



h — F. o. soap, 1 gm.-50 c. c. plus 



crude carbolic, 1% 

 i — Laundry soap, 1 gm.-200 c. c. 



plus cresol, 1% 

 j F. o. soap, 1 gm.-lOO o. c. plus 



crude carbolic, 0.59^ 

 k — F. o. soap, 1 gm.-lOO c. c. plus 



cresol, 1% 

 1 — Fish oil soap (solid), 1 gm.- 



50 c. c. 

 m— Resin fish oil soap, 1 gm-5 



c. c. 

 n — Nicotine resinate. 1-500 



Several interesting and important points are brought out in 

 this chart, but the most striking and significant one is the fact that 

 almost all the substances used show a gradual progressive decrease 

 in the number of eggs hatched (or vice versa, a progressive increase 

 in the number of dead eggs), when the spray is applied nearer the 



