PROCEEDIIS'GS OF THE THIRD E^'TOMOLOGICAL MEETING 479 



greater quantities of moths than if wintering in bolls raised up on a 

 table or otherwise sheltered from the moisture of the soil. (See Table 

 VI and Plate 82). These results are only just beginning to come 

 forward, and will require checking by a few more seasons' work before 

 generahzation will be safe. 



From breeding results obtained in the course of 1917-1918, the 

 following conclusions appear to be justifiable. 



The position in which material containing Pinl< Bollworms is kept 

 has a distinct influence on emergence of moths, both as to the period 

 of the year in which the main emergence may take place, and more 

 especially as to the total number of emergences. Bolls lying on the 

 ground appear to give a greater total emergence for a given quantity 

 than bolls raised off the ground. A further difference is found between 

 material collected early and late. 



A series of breeding experiments made by Mr. Adair is now begin- 

 ning to give information. In this work samples of fixed numbers of 

 green bolls, of open bolls, and of dead bolls were collected in various 

 parts of the country at ten-day intervals from 1st September 1917 

 finishing on 30th November 1917. 



It has been found that there is a difference in the emergence curves 

 for early and late samples, 11th October being very close to the turning 

 date. In very many cases emergence from early samples was more 

 numerous than from late samples. Here parasites may have had some 

 influence. (See Table VII and Plate 83). 



A very puzzling feature is the diversity in emergence from green 

 open and dead bolls. (Green bolls were bolls which were unripe at 

 the time of picking. Open bolls were recently opened bolls which would 

 not be rejected by cultivators taking their harvest ; and dead bolls 

 were bolls stopped in their development before ripening and which had 

 dried up prematurely.) (Plate 84). 



Ignoring all emergences which took place before 1st April 1918, 

 as being of little economic importajice, we find that of the emergence 

 from the three classes that from the " dead " bolls is possibly most 

 readily understood. Picked early or late, ' we find prabtically no 

 emergence of moths before July. Two-thirds of all the moths left 

 these bolls in July and August, but emergence was continuous to the 

 end of November. (See Table VIII). 



Very similar results were obtained from the early green bolls, no 

 emergence before July, maximum in July and August, and steady 

 numbers till the end of our observations (30th November 1918). 



Both of these sets, i.e., the complete " dead " boll and the early 

 part of the " green boll " gave comparatively few emergences. They 



VOL. II 



