r.(}3.(jlGU,T. j:i' 



TABLE 10 



Single cyst tests with Rothamsted (l) cysts raised 



on susceptible and resistant plants; initial 



population with about h% of resistance breakers. 



Cysts bred on NY27/3 (resistant)-:Kr 

 Ih 91 Ih 



0.13 

 6.U 



13.3^-;kh;- 



0^ 



•»• = Average content 37U eg^s/cyst, 



^HJ- = Average content unknown, but probably about 100 eggs/cyst. 

 ■JHH^ = Ijjcomes 16.7^, assuming 80^ take on Z3/7 as in Arran Banner. 



The original population contained approxijnately k% of resistance breakers 

 which agrees well with h.3% of cysts giving positive pots in the new 

 generation on Arran Banner, i.e. no change. The expected figure for the 

 population bred on a resister would be <20'^. The value 13.3"' to 16.75S 

 obtained for the same line raised on NY27/3 is also in fair agreement. 



