542 



PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



" Now as to the results of catching this number of moths as shown 

 by the yield from the different plots— they are not encouraging ! 



" The following Table shows the amount of cotton picked and the 

 loss we estimated to have taken place on each plot : 



WB— The crop was rather late and flooding interfered with the second picking. , ^ u- k 



Part of the 12-lamp plot was very poor ; hence there occurred the lowest yield on the plot which 

 showed the lowest loss. 



" From these figures it would appear that the intensity of the attack 

 was rather less on the 12-lamp plot than on the others, but I hesitate 

 to attribute it to the influence of the 12 traps. The following figures 

 obtained from an examination of green bolls picked from the three plot& 

 on 25th September are of some interest since they also show that the 

 intensity of the attack was less on the 12-lamp plot. 



12 Lamps 

 6 Lamps 

 Control . 



bolls i Sound 

 (green) ; 

 picked 



125 

 117 

 142 



23 







iN 



Attacked 

 by 

 Pink 

 Boll- 

 worm 



Injured 



" locks" 



per 



boll 



102 

 117 

 132 



Injured 

 " Divi- 

 sions " 



per 



boll 



Average Number of 



Pink boll- 

 worms 

 found 

 per boll 



0-82 

 1-7 

 1-3 



Pink boll- 

 worms 

 found per 

 boll if exit 

 holes are 

 counted as 

 Pink BoU- 

 worms 



Total 



Number 



of 



Earias 

 in all the 



bolls 



A'.B.-I reckon 6 divisions to the boll of 3 locks-each boll of unripe fibre being easUy divided 

 into two pieces. 



" My preliminary conclusions— so far as I have any— on this experi- 

 ment are that the 6 traps on J ieddan gave no protection of practical 

 use to the crop ; the 12 lamps per | feddan may have done something 

 to lessen the attack,' but as I do not know that all other conditions were 

 equal on the 3 plots I cannot be certain that this result was entirely due 

 * Kantar= 315 Bottles. A rotile is approximately one pound-weight. 



