rKOCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 533 



There were three series of four pits. 

 Plot I had bersim sown on it. 

 Plot II was left bare — ' bare-fallow.' 

 Plot III had wheat sown on it. 



One thousand bolls were removed from each pit on 30th April 1917 ; 

 31st May 1917 ; 30th June 1917, and 31st July 1917, and examined. 

 These dates are approximate — it was not possible always to remove bolls 

 on the exact date, but there was only a difierence of a day or two. 



A sample of 200 of the bolls (used for this experiment), examined 

 at the end of May, gave the following result : — 



First 100. Second 100. 



82 Pink Bollworms alive. 89 Pink BoUworms alive. 

 2 „ „ dead. 2 „ „ dead. 



1 „ „ dead (Pedicu- 8 „ „ dead (Pediculoides.) 



hides.) 

 5 Empty pupae (moth emerged) 3 empty pupee (moth emerged). 



These bolls had been kept in the Laboratory. 



Note. — The second 100 boUs were from a sample used in the 5 cm. and 10 cm. 

 pit in Plot II. The original sample gave out, Plot II being sown with bolls last. It 

 is possible that bolls in 5 and 10 cm. pit of Plot II were rather more heavily infested 

 than the boUs in the other pits which were from same field. The other lot came from 

 another locality. 



RESULTS. 



Plot I. Bersim. (Trifolium alexandrinum.) 

 Bolls buried 13th January 1917. 

 Plot irrigated and bersim sown 28th January 1917. 

 12th March 1917.— Irrigated. 



10th April 1917. — First cutting bersim and irrigated. 

 10th May 1917. — Last watering. 

 1st July. — Cut the bersim ; it was dry. 

 30th April 1917. — Removed 1,000 bolls from each pit. 

 5 cm. Pit. — 1,000 boUs. They had not broken up and had not rotted. In these 



Found 34 live Pink BoUworm larvae. 



9 „ pupae Pink BoUworm. 



22 empty pupa cases. 

 10 cm. Pit. — 1,000 bolls ; mostly not broken up — slightly decayed. In these were- 

 Found 18 live Pink BoUworm larvae. 

 5 Uve pupae, 

 7 empty pupa cases. 

 15 cm. Pit. — 1,000 boUs; a good deal decayed and broken up. In these were- 

 Found 5 live Pink BoUworm larvae. 

 1 live pupa. 

 8 empty pupa cases. 



