EFFECT OF SPRAYING 45 



Solutions (a), (b) and (c) were sprayed on to 28 trees, 

 each of the trees being in two rows separated by intervals 

 of two rows which were unsprayed. Solution (d) was 

 sprayed on 7 trees only as it was feared it might injure the 

 leaves seriously. On the same day the ordinary resin 

 wash was also sprayed on 96 trees. 



Effect on Plants. — All the trees were in blossom and 

 the open flowers were badly scorched. The petals were 

 blackened in patches and the tips of the stigmatic surfaces 

 were also discoloured. The worst effect was produced 

 by the ordinary resin wash which blackened the leaf tips 

 also to a considerable extent before two days had elapsed. 

 The leaf tips were hardly affected by the new insecticide. 

 After about five days a very narrow margin was found 

 blackened in the case of solutions {h), (c) and {d). On the 

 whole the scorching effect of the new insecticide was 

 negligible. 



Effect on the Bugs. — Survivors were left in all cases, 

 either young underneath which had not been touched by 

 the spray, or adults themselves. The smallest number was 

 found on trees s-prayed with solutioii {d). (4 lbs. to one tin). 

 With regard to solutions {h) and (c), there was very little 

 appreciable difference between them or between them and 

 the ordinary wash except that, in the latter case, the 

 scorching was greater. K 2 lbs. to the tin solution will, 

 if spraying is done carefully, prove as effective as a 3 lbs. 

 to the tin solution or the ordinary resin ^'ash. 



Mixtures (6) and ic) were tried again on thirty trees in 

 three rows each and the ordinary resin wash was also 

 sprayed similarly, the trees in the central row were exam- 

 ined after an interval of a week and the result was again 

 found to be practically the same. 



Fish oil soap was also compared with ordinary bar 

 soap in the usual resin soap mixture. Of the two 

 mixtures tried, the one containing the fish oil soap proved 

 superior to that containing the latter. There was a greater 

 percentage of deaths, as the mixture had greater penetrat- 

 ing power. In all cases the trees sprayed had the smell 

 of fish oil about them, for a few days after they were 

 sprayed." 



The new insecticide having been found effective, it 

 was recommended to planters. It at once became popular 

 and replaced the ordinary wash on practically all estates 

 in Mysore and Coorg. During the first year about two 



