514 



PROCEEDINGS OF THE THIRD ENTOMOLOGICAL MEETING 



Dr. Gough. 



Brown. 



Dr. Gough. 



Dr. Gough, 



Mr. Senior-White. 



in the unirrigated area. In our Province we get tlie attack equally 

 badly in the unirrigated and in the irrigated lands. What is the result 

 of ploughing the bolls in ? 



Bolls ploughed underground are as dangerous as those left on the 

 field and burning is necessary. As a matter of fact, bolls on the ground 

 are more dangerous. In our experiments those placed on the ground 

 produced more adults than those raised ofE the ground on tables. Bersmi 

 follows cotton in Egypt and it is irrigated, but the irrigation has no 

 effect on the bolls in the ground. Sometimes hersim is sown before 

 the cotton is removed and the cotton-sticks are pulled out later ; we 

 have examined bolls that were lying underground under these condi- 

 tions and found that a large number of them contained living larvae.- 

 How deep can you bury the larvae without killing them ? 

 I cannot say, but a few inches do not do them any harm. The 

 cotton-field must be swept up before it is ploughed. 



The point raised by Mr. Burt is dealt with in Mr, Willcocks' paper 

 which will be taken next. 



The difficulty about legislation is that cotton is not our best crop. 

 I have seen that sheep are very fond of cotton-bolls and if they are 

 turned into the cotton-field at the end of the cotton season, they will 

 eat all the bolls. 



They are useful and will take the last boll and also pick up bolls 

 lying on the ground, but we have not got sufficient sheep in Egypt to 

 go around. 



Has any work been done in Egypt on parasites as controls for P. 

 gossypiella ? 



We are only just touching the fringe of this work. We have not 

 yet done any work on the utilization of parasites, but certainly some 

 parasite is controlling it. 



We have a parasite on Earias. 



Farias is a rarity with us now and the Earias problem has ceased 

 to be a practical problem for Egypt. 



Is there any variety of cotton in Egypt that is free from Gelechia ? 



There is no variety that is free from it. 



I found at Peshawar that Texas Big-boll was comparatively more 

 immune. 



I may mention that a long-cycle generation of P. gossypiella occurs 

 ii3 India. We have received double seeds fi-om India from which a 

 moth emerged after two and a half years. 



In 1917 I grew a small experimental plot of Cambodia cotton in my 

 own compound in the Matale District, Ceylon, Cotton is not a 

 commercial crop in Ceylon, and I doubt if in Matale district any cottoix 



