218 SCIENCE AND FRUIT GROWING 



One conclusion which was drawn from the observation at 

 Woburn was that infestation by the mite is greater, the stronger 

 and healthier the bushes are, this being probably due to such 

 bushes affording more sustenance for the insect 



Varieties of black currant certainly differ in the degree of suscep- 

 tibility to an attack, Baldwin's Black being the most susceptible 

 of the six varieties examined, and Old Black least so. But this 

 difference is probably due, more to differences in vigour of growth, 

 than to any intrinsic differences in susceptibility. 



