EFFECTS PRODUCED BY PINK BOLLWOEM ON THE YIELD OF COTTON SEED. 315 



or shut appears to have made but little difference to the catch, the light evidently- 

 being a superior attraction to the draught. 



The objections which were urged against the screening of the windows, before 

 legislation in the matter was introduced, do not appear to have been realised during 

 the summer of 1917. 



Table XXIV. — Shoiving the Daily Numbers of Gelechia Moths caught during 

 the period 6th to 26th September, 1917. 



September. 





6 



7 



8 



9 



10 



11 



12 



13 



14 



15 



Moths caught 

 Windows 



318 

 open 



943 



closed 



2470 

 closed 



4500 

 closed 



7960 

 closed 



5500 

 closed 



8 



closed ; 



light 



not 



burning 



6060 

 closed 



5670 

 open 



2800 

 closed 





September —cont. 











16 17 



18 



19 



20 



21 



22 



23 



24 



25 



26 



Moths caught 

 Windows 



5500 

 open 



2222 

 closed 



1 



open ; 



light 



not 



burning 



821 



closed 



1403 

 open 



1524 

 open 



1610 

 open 



985 

 open 



710 

 open 



227 

 open 



D. The Destruction of Gelechia Larvae in Seed as carried out on a Commercial 



Scale in Ginneries. 



During the winter 1917-1918 six of the ginneries in Upper Egypt secured the 

 necessary machinery to treat by heat the seed ginned in order to kill the pink 

 bollworm, in conformity with Law No. 29 of 1916. Although the Law was not 

 yet in force, a large quantity of seed intended for sowing was treated in the machines. 

 Thus all the Ashmuni seed distributed by the Ministry of Agriculture was disinfected, 

 together with a considerable further quantity intended for private clients of the 

 firms in whose ginneries machines were installed. 



The working of the machines was tested by the Entomological Section, submission 

 to the control being voluntary on the part of the ginners, owing to the fact that 

 the Law was not being enforced. Two types of machine were being used ; five 

 of the factories working the Simon's malt-drying machine, made by Messrs. Eichard 

 Simon & Sons of Nottingham, and the sixth a machine known as the " Delta," 

 made in Egypt (for description see Storey, Bulletin Min. of Agric, Egypt, No. 14). 



