90 POMONA JOURNAL OF ENTOMOLOGY 



dipped in linseed oil, which rendered it so. In use it did not take more than 

 half the dosage to get the results obtained with the other tents, but in no case 

 could more than 90'/p be killed. The oil rotted the cloth, and the weight alone 

 made the tent impractical. 



This year we started with what knowledge had been accumulated the year 

 before, but without better results. 



The dosage was increased from Schedule No. 1 to three and four times 

 its strength! The trees were very badly burned in many cases with a heavy 

 loss of fruit, and a serious back-set to the tree. 



In general the work was done with double Dosage No. 1, or to 3 oz. of 

 Cyanide, 3 fluid oz. Sulphuric Acid, and three times as much water to 100 

 cu. ft. of tent space, the Morrill system being used exclusively. 



It was found that two tents over the tree gave excellent results and prom- 

 ised to do the work, and this was used in most of the fumigations for the 

 Alealy Bug. Later inspections however have revealed the fact that little better 

 results were really obtained, for live individuals and eggs are plentiful on all 

 fumigated trees. Where the dosage was increased Ij^^, 2, 23/2, 3, 3y2 times 

 the results were no better than the nor)nal dose! The following table of in- 

 spection will show this : 



Dosage 1 equals Woglum's Schedule Dosage No. 1. 



At the present time the results show very discouragingly for fumigation 

 but our work gave the scale a decided set-back, the advantage of which we 

 hope to take by now introducing all the enemies of the mealy bug. Of course 

 we must concede that the pest has been intrenched for so long that it cannot 

 be cleaned out in so short a time., but we contend that two years should give 

 at least some results which might be hopeful. Fumigation has not given this. 



However, the general outlook is not so discouraging as would appear from 

 the foregoing account. The enemies are doing excellent work. Cryptolacmus 

 montrouzieri was introduced last year by P. E. Smith. Now it is simply be- 

 yond belief how it has increased. In every part of the orchards where it was 

 l)laced last year it may be found abundantly. Hundreds have been found 

 pupating on one tree trunk. 



